‘A land of permanent drought’: Desert golf courses in California work to cut water usage

From taking out turf to upgrading irrigation systems, golf courses are constantly focused on water.

In charge of 500 acres of irrigated turf at Sun City Palm Desert, including two 18-hole golf courses, parks and softball fields for the 50-and-over community of 5,000 homes, Tyler Truman is no stranger to concerns about how much water the courses and the surrounding areas are using.

“I can see where (the critics) are coming from,” said Truman, director of agronomy at Sun City, which includes the two golf courses at the Mountain Vista Golf Club. “And you listen to them. And then you try to educate them. This is how we are trying to use the water. This is how we are using the water.”

As the drought in the southwest deepens, with a first-ever Level 2a Shortage Condition declared for the Colorado River—a major source of water for the desert and all of Southern California—golf courses in the Coachella Valley are aware that golf is always a target for those looking at water usage.

With golf courses using between 750,000 and 1 million gallons of water a day in the desert, and with 120 golf courses in the Coachella Valley alone, golf industry officials know they need to both reduce water usage and reinforce the benefits of the usage.

Mike Whan, executive director of the U.S. Golf Association, said earlier this year he’d like to see a 45-percent reduction in golf course water usage in the next 15 years. Other USGA officials are now trying to figure out how to meet such an aggressive goal.

“I was part of a meeting to discuss if that number is realistic or not, and I think it probably is,” said Brian Whitlark, agronomist for the West Region Greens Section for the USGA based in Arizona, whose region includes the Coachella Valley. “Will a golf course in Los Angeles reduce its water by 45 percent? Probably not. But nationwide, I think that is possible.”

Firecliff Course
The Firecliff Course at Desert Willow Golf Resort in Palm Desert, California. (Photo: Jay Calderon/The Desert Sun)

From taking out irrigated turf to upgrading irrigation systems and computer technology, golf courses are constantly focused on water, said Craig Kessler, director of government affairs for the Southern California Golf Association.

At the recent Southern California Golf and Water Summit in Chino Hills, Kessler was one of the speakers to a crowd of more than 200 golf professionals, general managers and course superintendents looking to share ideas and learn new strategies on water reduction.

“We want to continue to bring this great game to Californians,” said Kessler, who is also the chairman of the Coachella Valley Golf and Water Task Force. “And we understand that we live in a land of permanent drought. As we read the headlines every day, we can see the consequences of a warmer, drier climate. We recognize that we need to do those things, we are dedicated to doing those things and we want to do those things in partnership.”

The summit was held in the shadow of negotiations on availability of Colorado River water that saw Nevada and Arizona have their water allotments cut by the federal Bureau of Reclamation by as much as 21 percent. The Coachella Valley Water District and the Imperial Irrigation District are still negotiating river water allotments.

The drought is a major concern for the California golf community, which the California Alliance for Golf estimates is a $1.2 billion per year industry. In the Coachella Valley, the alliance estimates 8,000 people are directly employed in the golf industry.

Making progress on reductions

For Truman, cutting water usage at Sun City Palm Desert began when he arrived at that job 11 years ago.

“When I first got here, we were using close to 4,000 acres feet of water a year,” Truman said. “With using the technology, the soil moisture meters, not just in greens, but with Toro’s in-ground sensors, we’ve now gone from 4,000 down to 3,000 in that time period.”

To save an acre foot of water, or 325,851 gallons, managers like Truman rely more and more on technological advances. That includes soil moisture meters, which measure moisture in the soil at various spots on the golf course. Irrigation software allows Truman and his staff to individually control the nearly 10,000 sprinkler heads at Sun City Palm Desert.

Moisture detectors on the Santa Rosa and San Gorgonio golf courses allow Truman to identify where turf is being overwatered or underwatered against Truman’s desire for an 18 to 20 percent soil saturation goal. Soil wetting agents, which draw water from the surface down to the roots of grass plants, also help courses cut back on water use.

Whitlark says more courses should be using soil moisture sensors, which cost no more than $15,000 or $20,000 for a course. But other measures also will save water, he said.

“Just optimizing the irrigation system by raising the level of the sprinklers, changing nozzles, changing the irrigation system about every 30 years to save water, the strategy of wetting agents and growth regulators, that one’s not really being utilized to the extent that it can be,” Whitlark said.

Advances are also being made in the grasses being used to carpet desert courses. At UC Riverside, the turfgrass science department is developing Bermuda grasses that could stay green in both summer and winter in the desert. That would reduce the need for overseeding, the process of converting from warm-weather Bermuda grass to cool-weather grasses like rye grass. Even changing from old types of Bermuda to new hybrid Bermuda grasses can save water, said Dr. Jim Baird of UCR.

Golf Club at Terra Lago
The Coachella branch of the All-American Canal flows through the Golf Club at Terra Lago in Indio, California. (Photo: Jay Calderon/The Desert Sun)

“The savings would be in the 30-percent range, realistically, but is that enough to do this?” said Baird, a turfgrass specialist for UCR. “As we mentioned, renovating from one Bermuda grass to another Bermuda grass is no easy measure. Because one thing I know about Bermuda grass is it is hard to kill. So that said, I think we certainly will do our best in that regard to make some strides.”

River, recycled water important

The source of irrigation water is always a concern for desert courses, especially in light of the ongoing negotiations over the Colorado River and historic low levels in Lake Mead in Nevada, said Scott Burritt, director of service and communications for CVWD.

“The golf courses have a strong interest in conserving water because that’s part of their bottom line,” Burritt said. “It can be a major expense, so they have an interest in conserving water, and there are a lot of discussions about what different golf courses are doing.”

Thirty-six Coachella Valley courses use strictly Colorado River water for irrigation, while another 17 ½ courses (a course is considered to be 18 holes) use a blend of river water and recycled water from CVWD. Other courses use ground water from the aquifer beneath the desert, with Burritt saying CVWD replenishes more than 40,000 acre feet of water to the aquifer each year.

Plans for switching another 40 ½ courses to non-potable water are underway, though many of those courses need pipes extended from the two CVWD recycling plants to reach the courses before switching over. Burritt said current street work in Palm Desert is designed to take more recycled water to big landscape customers like golf courses.

But Burritt points out that recycled water’s drawback is that in the summer, when courses need more water to fight high temperatures, the desert has less recycled water available because fewer people are in the desert to take showers or flush toilets.

Turf reduction could be key

Another strategy for reducing water is simply reducing the amount of turf being irrigated. In the last seven years, CVWD reports more than 160 acres of turf, or the equivalent of nearly two average golf courses, have been removed at desert courses, but convincing golf courses to reduce turf and replace it with drought-tolerant native plants and desert landscaping can be difficult.

“You don’t just remove turf and you are done with it,” said Chris Bien, head agronomist at the city-owned Desert Willow Golf Resort in Palm Desert. “There is a cost involved with (removing) it. There is a cost involved with maintaining it, and that sometimes gets shoved under the rug.”

Whitlark and superintendents in the desert say removing an acre of turf can cost $20,000, including putting in new irrigation systems and planting drought-tolerant plants in place of grass. At one time CVWD offered a rebate of $15,000 to golf courses for each acre of turf removed, up to seven acres per course. But money for the project ran out, and Burritt said the agency is always looking for more grant money for such programs.

While the return on the investment of reducing turf may not be immediate for golf courses, Truman hopes more courses make changes.

“What I am seeing is that the newer people that we have, the younger generations that are moving into our facilities, a lot of them are okay with the desertscape popping up in (golf) areas,” Truman said. “You are getting people who are understanding hey, we need to do this. The older generation likes that parkland setting where everything is green and lush. So I think just like everything, the younger generation is more open to it.”

Removing turf is also something that impacts course homeowners, Bien said. Desert Willow has two courses, the Mountain View and the Firecliff, totaling about 150 acres and including acres of desertscape on both courses.

“It’s a property-to-property thing, though, because you run into a danger of are there homeowners next to your golf course,” Bien said. “That is their backyard and they want the green backyard, and there are property values and the like to think about. For here (at Desert Willow), we don’t really have homes on Desert Willow, which is great.”

Whitlark said repeating the message of turf reduction is important, with Arizona golf courses often having just 70 to 80 acres of turf compared to courses in the Coachella Valley that often have between 100 to 120 acres of grass. The message isn’t always popular but needs to be pushed, he said, pointing to a course in Sun City, Arizona, he has been working with for 15 years.

“My very first visit, they almost shoved me out of the room,” Whitlark said. “But every year, I just kept saying it, turf reduction, turf reduction. Finally they realized they need to make some changes because they saw the writing on the wall.”

Cutting back expectations

Part of the problem for golf courses in the desert, particularly private ones, is that the area has a reputation for perfectly manicured and green golf courses in the winter. Those are two factors that lure snowbirds to the area for months at a time.

“That’s tough. It’s just such a long history of having that oasis out there in the wintertime,” said Baird. “That’s going to be tough.”

Overseeding, the planting of cool-weather grasses to keep courses green in the winter, is still needed because Bermuda grass can go dormant and brown in the winter, when part-time residents and tourists spend their time in the area.

“From October to May is so important as the prime revenue season,” Whitlark said. “Overseeding is still going to be important for now and probably not something that courses can consider reducing.”

Some golf visitors to the desert don’t want to see a change in what they view as a key element of the appeal of desert courses: a lush, green carpet of grass. Doug Evans of Oklahoma City, who was recently playing golf in the desert with two of his friends after not visiting for a few years, said he loved the conditions at Marriott’s Desert Springs on a hot afternoon.

“The course is beautiful. But if the golf course was not in as good a shape or was brown, what would be the point of being here?” said Evans, who spent his summer golf vacation last year in Arizona.

Other golfers understand the drought might cause needed changes.

Firecliff Course
The Firecliff Course at Desert Willow Golf Resort in Palm Desert, California. (Photo: Jay Calderon/The Desert Sun)

“You can walk around any golf course and see areas where there is grass where no one is going to hit a golf ball,” said David Barnett of Mission Viejo, California. “So why not take the grass away. It is the desert, so let it be the desert. We save water all the time in Orange County. The desert should, too.”

Bien says expectations have to change based on the golf course and its clientele.

“There are different levels of managing expectations. I want to have a firm, fast golf course,” Bien said. “People get better playability out of a firmer, faster golf course. Does that mean that I’m okay having the golf course brown? No, it does not. Does that mean I’m okay with having a brown spot here or there? Absolutely.”

Looking to the future

Truman said talk of river water cutbacks have to be a concern for desert courses.

“California has a lot of water rights, but who’s to say if this federal government doesn’t step in and renegotiate all of those rights?” Truman said. “I know CVWD will do everything to protect our water. Hopefully, we can keep those things. But I look at people who need water and we need to manage our water the best possible way that we can.”

Whitlark says with a focus on water reduction for golf courses, mandatory cuts might be in the future.

“It is probably going to take a regulatory body to say, hey, I don’t care how you reduce the water use, but you are going to have to reduce the water use by 20 or 30 percent,” Whitlark said. “It is probably going to take that. Either that or water costs are going to have to go through the roof. Now many of those courses use canal water, which comes from the Colorado River, so I imagine they are going to feel some impact from the Bureau of Reclamation.”

For Kessler, keeping the regulatory agencies and state government out of the decision process is important, but so is assuring the future of golf and courses.

“What is the point of living in the great southwest in Southern California or Arizona or Nevada, where you can literally play golf 365 days a year, if we can’t continue to provide golf,” Kessler said.

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Some Arizona golf courses are pushing back against state’s plan to reduce water use

Golf courses are pushing back against a proposal by state officials that would reduce overall water use on courses.

PHOENIX — Managers of some Arizona golf courses are fighting a plan that would cut water use at a time when the state is being forced to confront shrinking water supplies.

A group representing golf courses has been pushing back against a proposal by state officials that would reduce overall water use on courses, instead offering a plan that would entail less conservation.

Opposition to the state’s proposal for golf courses has emerged over the past several months, aired in sometimes-tense virtual meetings where representatives of courses have said they understand the need to conserve but are concerned the proposed reductions in water allotments would damage their businesses.

The latest proposal by the Arizona Department of Water Resources would require Phoenix-area golf courses that use groundwater to reduce their total combined water use by 3.1 percent compared to current allotments under a previous plan.

Representatives of a newly formed group called the Arizona Alliance for Golf opposed those reductions and offered a counterproposal that, based on the state’s analysis, would decrease water use on courses that pump groundwater by 1.8 percent.

The group’s attempts to assert its position have included repeated meetings with state officials, the launch of a new website urging people to “speak up for Arizona golf,” and emails seeking to recruit more members to “have a united voice” and “protect our game.” The group also welcomed Gov. Doug Ducey as their featured speaker at a kick-off event in April.

The resistance from the golf industry has surfaced as Arizona’s water outlook has grown increasingly complicated, with a shortage looming on the Colorado River and groundwater declining in many areas beneath growing cities and suburbs.

The disagreement shows that even a modest plan for using less water can generate considerable opposition from some in the golf business, and it also indicates state water regulators may continue to grapple with resistance — even in the face of severe drought and the effects of climate change — as they seek to implement requirements of the 1980 law that regulates groundwater in parts of Arizona.

“I’m astounded that we are 40 years into the Groundwater Management Act and we are still arguing about whether the department can, in fact, impose minor conservation requirements on golf courses,” said Kathleen Ferris, a water researcher and lawyer who previously headed the state Department of Water Resources.

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Ferris said she understands that a number of golf courses aren’t fighting the water-saving proposal and are “really trying to figure out what it is DWR needs them to do and how they can comply with reductions in their water use.”

State records show there are 165 golf courses in the Phoenix area. They use various sources of water, including treated wastewater and Colorado River water. But more than half of the area’s courses rely at least partially on groundwater, together pumping roughly as much from wells as the average consumption of 130,000 single-family homes.

As state officials finish drafting their plan for reductions in water use on golf courses in the coming months, the allotments that are established will affect how much water is sprayed on courses in the desert for years to come.

“We need to increase our conservation and decrease our groundwater withdrawals,” said Tom Buschatzke, director of the Arizona Department of Water Resources, speaking at an April 28 online meeting attended by more than 400 people.

It was the latest public meeting between state water officials and golf course managers, and one in a series of state-convened work groups focused on developing updated groundwater plans — technically called the fifth management plans — for the five “active-management areas” where pumping is regulated around Phoenix, Tucson and Prescott as well as Santa Cruz and Pinal counties.

Shrinking supplies drive water-saving needs

Buschatzke began with an overview of Arizona’s worsening water challenges, including the declining reservoirs of the Colorado River, which store water that flows through the Central Arizona Project Canal to desert cities from Scottsdale to Tucson.

“I wanted to give you the context of what’s happening, challenges that are facing our state with the management of the Colorado River,” Buschatzke said.

He showed a chart tracing the declining water levels in Lake Mead since 2000, a blue line descending like a mountain slope toward a threshold that will soon trigger an official shortage declaration by the federal government.

“Unfortunately, Lake Mead and the Colorado River keep declining. We’re on the verge of taking very large reductions in our Colorado River water use starting in 2022,” Buschatzke said.

The watershed is trending, he said, and Lake Mead’s levels could continue to drop toward lower thresholds that would bring bigger cuts for Arizona, Nevada and Mexico — and potentially for California if the reservoir keeps declining.

Other slides detailed the cutbacks that would be required if the reservoir falls toward critically low levels, something a 2019 deal among the states aimed to avert. Buschatzke also described a worst-case scenario.

“At dead pool, 890 feet elevation, no water moves past Hoover Dam. No water. The river will be dry and Arizona will not have any Colorado River water,” Buschatzke said. These larger challenges with the river, he said, relate to the conservation that’s needed under the new management plans in all sectors, including golf.

Other details about the water plans were explained by Natalie Mast, the department’s director of active-management areas, who said the guiding purpose in each successive plan is to achieve reductions in groundwater pumping. She gave a recap of previous meetings since 2019 and said time is tight to finish developing the plans.

“We’re kind of in a red zone here. We’re pushing the limits of our timeline in order to complete the drafting of those fifth management plans,” Mast said. “We do need to work through the finalization of these programs in a relatively quick manner.”

The presenters from the state water agency went over their proposal, an earlier iteration of which they floated in February. The compared their proposal with the different plan presented by the Arizona Alliance for Golf.

Phoenix
The Central Arizona Project canal winds through the city of Phoenix. Photo by David Wallace/The Arizona Republic

They also delved into complex details about how the plan would work. For one thing, the changes in water allocations wouldn’t be the same for all golf courses. Under the state’s proposal, the changes in allocations would vary widely depending on the course. Examples listed in the proposal show that some large courses might face a reduction of as much as 24 percent in their allotment, while other courses would have smaller reductions, such as 8 percent or 11 percent, and some courses would actually see their allotments increased.

State officials said their goals, in addition to reducing the amount of groundwater pumped, include improving the “simplicity” of the system of water allotments and achieving “equity” among golf courses, recognizing that some have made more progress than others in becoming more efficient.

The reductions in allotments apply to all courses that use groundwater, some of which also use water from other sources. The analysis by the Department of Water Resources showed its proposal would mean an overall decrease of 1.3 percent in the aggregate water allotments of all golf courses in the Phoenix area. In contrast, state officials found that the alliance’s proposal would slightly increase the combined water allotments of all courses by 0.1 percent compared to the last management plan.

Buschatzke said representatives of the Arizona Alliance for Golf asked to meet with his department in November, and they’ve had 11 meetings, five of which he attended.

However, Buschatzke said, the golf alliance’s latest proposal wouldn’t satisfy the goal of reducing water use and “is not something that meets our requirements.”

He said the state is proposing “small reductions,” and added that he thinks “it should be as much as we can achieve under the golf program given all that is happening with our water supplies.”

‘Fundamental disagreements’

Then representatives of the Arizona Alliance for Golf spoke.

The group was formed “to bring unity and cohesion to these really important conversations,” said Katie Prendergast of the public relations firm Horizon Strategies. The meetings between the group and the department in recent months have aimed at finding a “workable proposal,” she said, “one that provides the water necessary for courses to remain economically viable while enabling the department to meet its statutory requirement.”

“Based on today’s presentation, we don’t have the same perspective as the department and there are clearly gaps we need to work through,” Prendergast said.

Also speaking for the alliance, Rob Collins of Paradise Valley Country Club touted the golf industry’s efforts to conserve.

“Water is expensive, so it’s critical to our businesses and it’s a major expense,” Collins said. “We are naturally water-savers.”

Collins said he thinks it would be better to “look at real-use numbers rather than being focused on plan-to-plan reductions,” as the state agency is doing.

Bri Kenny of the Scottsdale-based golf management company Troon said she thinks “it’s super necessary that we have another meeting.”

“We do have fundamental disagreements on these plans,” Kenny said. “And it actually stems back to the approach in calculating reductions and the quality of the data that exist, that you’re calculating the reductions from.”

Buschatzke said he and his staff are open to having another meeting.

“Remember, when you talk about the data that we’re using, this is data that is reported by the golf courses, by the golf industry to us, as is required under the law,” Buschatzke said. “We’re relying on the accuracy of the data you’re providing to us in your annual reports. So if there are ways you can make that data more accurate, we would encourage you to do so.”

Buschatzke reiterated that his agency is required to calculate these allotments to achieve reductions in groundwater use.

The Arizona Alliance for Golf says on its website that golf “is a driving force behind the state’s real estate and tourism industries, accounting for thousands of jobs and at least $4.6 billion in direct economic impact each year.” The group also says Arizona’s golf industry is a national leader in water conservation and “must be part of both the conversation and the solution” as state officials debate the future of water use.

Mark Woodward raised those points during the meeting. Woodward, president of Arizona’s Cactus and Pine Golf Course Superintendents Association, said he’s been in the business 52 years and the groundwater management plan that’s being discussed is “the biggest issue we’ve ever faced.”

“Rushing any decisions related to the plan would not be good for the industry. It would not be good for the department or anything. It’s critical that we get these decisions right,” Woodward said. “Because potentially any decisions you guys make are going to be impactful to the golf industry for the next 10 years or more.”

Woodward said more time is needed to “clean up the data” and the department should consider “the big picture, to look at the return on investment that golf brings for the small amount of water that we use — less than 2 percent of the state’s water supply.”

He also urged state officials to consider the progress golf courses have already made over the past 30 to 40 years in reducing water use.

“In many cases, there’s not a lot of room for improvement. We’ve already done more than most industries have already done. So we’re way ahead of the curve,” Woodward said.

“Let’s work together to ensure that decisions are well thought out and they accomplish all the goals of the department,” Woodward said. “You have goals. We understand that. But we also have an industry to run and we don’t want to do anything that’s going to jeopardize that industry, and I don’t think the governor or anybody wants to do that, frankly.”

Woodward said he and others in the golf industry also have questions about how the department is developing its proposals.

“It is the most critical thing that has happened in the last 50 years in this industry,” Woodward said. “We fully understand the need to operate efficiently and effectively, and use water wisely. We’ve been doing that for years. This is nothing new to us. We have a shared goal with you all: savings of groundwater. We understand that you have a goal to reach. We get that. But not at the expense of damaging an industry.”

Many golf courses use groundwater

Buschatzke replied that he and his staff “recognize the need to have a program that allows the golf industry to continue to move forward.” He said they’ll continue to accept comments about any of the proposals.

“But everyone needs to understand as well that we are under a deadline,” Buschatzke said. “We need to move forward and come to some closure very soon.”

More than two years ago, he noted, the state’s Auditor General pointed out the department was behind schedule on the groundwater management plans and said it needed to catch up. The agency’s regulators are now trying to wrap up a draft proposal for golf water allotments this year.

To examine water consumption on golf courses, The Arizona Republic requested data from the Department of Water Resources under the state’s public records law. The records show 219 golf courses across Arizona used a total of 119,478 acre-feet of water in 2019. The average amount of water used per course was 504 acre-feet during the year, or about 450,000 gallons a day.

More than half of the golf courses pump groundwater, which accounted for about 46 percent of all golf water use in 2019. Treated effluent from wastewater plants accounted for 27 percent of water use, while about 15 percent was Colorado River water from the CAP Canal. The remainder came from other sources.

A majority of the courses, 165 in all, are located in the Phoenix active-management area. The state data shows 89 of these courses rely at least partially on groundwater. During 2019, the records show, they pumped 44,354 acre-feet of groundwater, or 14.4 billion gallons, about as much water as 130,000 typical single-family households.

During the meeting, Buschatzke said his department is proposing a small overall reduction in groundwater use “because we do recognize much of what’s already been done in the golf industry with efficiencies, with how well the water is managed, and that some turf has already been reduced.”

Courses that are entirely reliant on surface water or recycled water don’t fall under the requirements of the groundwater law. “But if you have one molecule of groundwater in what you put on the golf course, you then are subject to penalty if you exceed your allotment,” Buschatzke said.

And while some courses face larger reductions than others, Buschatzke said, the overarching goal is to reduce water use industry-wide.

Some golf managers asked whether there will be a grace period to take out grass on portions of their courses. Others voiced specific concerns about how their courses and country clubs will fare.

Jan Ek, general manager of the Recreation Centers of Sun City, said she oversees seven large 18-hole courses that were built in the 1960s and ’70s, plus one 9-hole course.

“In most cases, we are over allocations on every golf course. It was built with wall-to-wall green,” Ek said.

She said they’ve been switching to more efficient irrigation systems and converting some areas to desert landscaping, and have also asked their board to approve spending more on grass removal. Ek said they have removed turf on about 60 acres so far, but “we’ve got a long ways to go.”

The new management plan is “beyond scary, because I don’t even know how we could possibly get there,” Ek said. She said she’s also looking at the expense of fixing a leaking lake, making for a list of projects that need to be addressed. And reducing water use on the scale proposed, she said, will be a “huge undertaking.”

And then there’s the size of the golf courses, she said, “because I have courses that are so large they could be two golf courses.”

Ek said she wants to get her courses into compliance with the water allotments. She asked Buschatzke if they could meet with him or his staff to go over a plan that would move toward the goal and still be affordable.

“Absolutely, we would be willing to sit down and work with you on a plan. I can’t guarantee what the result would be,” Buschatzke said. “And if there’s a mechanism to come to a legally binding agreement in that regard, we’re willing to talk about that with you as well.”

“That would be excellent,” Ek said. “We would very much appreciate that opportunity and, you know, ability to negotiate if we need to, to get ourselves to that point.”

Grappling with a ‘drier future’

One subject that came up only once during the meeting was climate change, when Buschatzke briefly uttered the words and referred to the “long-term effects finally hitting us from the drier future.”

But no one mentioned the fact that when it’s hotter and drier, as it has been recently, plants consume more water through evapotranspiration — something golf specialists track on their computer screens with sophisticated systems that pinpoint the irrigation demands on their greens and fairways.

And climate data from the federal government shows the Southwest has grown significantly hotter over the past decade, experiencing more pronounced warming than other regions of the country, which affects the amount of water needed per acre of green grass in the desert. In other words, at a time when golf courses are being asked to conserve more, hotter average temperatures are gradually pushing per-acre water demands higher.

At the same time, scientists have found that the Colorado River watershed is sensitive to warming and that higher temperatures have contributed significantly to the severe drought over the past 22 years.

Scientists describe it as a “megadrought” in the West and one that, unlike the long droughts of the past, is being amplified by carbon pollution and the heating of the planet.

Lake Mead, the largest reservoir on the Colorado River, declined last week to the lowest level since it was filled in the 1930s following the construction of Hoover Dam. Some researchers have estimated the Colorado River could lose roughly one-fourth of its flow by 2050 as temperatures continue to rise, and that for each additional 1 degree Celsius (1.8 degrees Fahrenheit) of warming, the average flow is likely to drop by about 9 percent.

Arizona gets an estimated 36 percent of its water from the Colorado River, and a large portion of it flows through the CAP Canal to cities, farms and tribal lands.

But with a first-ever shortage expected next year, mandatory cutbacks will reduce the Central Arizona Project’s water supply by nearly a third. That will shrink the amount flowing through the CAP Canal to farmlands in Pinal County that produce cotton, hay and other crops.

In a first-level shortage, the water supplies of Arizona’s cities are protected from cuts under the state’s plan. That could change, though, if Lake Mead continues to drop and reaches lower thresholds that would trigger larger cuts.

While the water outlook in the Southwest has worsened over the past year, the organizers of the Arizona Alliance for Golf have sought to mobilize support.

At an event on April 27, members of the alliance welcomed Ducey, who gave opening remarks.

In a tweet, the governor shared a photo of the audience listening to his speech. Ducey tweeted: “The golf industry is critical to growing Arizona’s economy, job opportunities and tourism. Today, I’m proud to help kick off the Arizona Alliance of Golf and ensure our state remains the premier golf destination.” He also mentioned Grayhawk Golf Club.

C.J. Karamargin, Ducey’s spokesperson, said the governor “has been very focused on water issues and he has spoken about the need to prepare for a drier future in Arizona.”

The Department of Water Resources is working on the groundwater management plan through a transparent public process, Karamargin said, and “we’re going to wait and see what happens there, how that plays out.”

Repeated studies have examined golf’s contributions to Arizona’s economy. Four years ago, researchers at the University of Arizona found that the golf industry contributed $3.9 billion in sales to the state’s economy in 2014.

An economic study released in December by the Arizona Alliance for Golf said the industry supports about 50,000 jobs in the state and in 2019 generated an estimated $4.6 billion in economic activity and about $388 million in tax collections.

On National Golf Day several years ago, Ducey’s office said in a statement that “Arizona is a hole-in-one for golfers” and that it’s “a real boon for our economy.”

The membership of the Arizona Alliance for Golf also includes a public entity that manages Phoenix’s public courses. Gregg Bach, a spokesperson for the city of Phoenix’s Parks and Recreation Department, said the city’s Phoenix Golf section is a member of the alliance.

Not everyone in the golf industry opposes the state’s water conservation plan. Chip Howard, an agronomist and golf industry consultant, said that with a few exceptions, “I find this plan to be fair and equitable among golf courses.”

“That said, there will be a few already-small golf courses that will find the proposed plan to be challenging,” Howard said. “I hope that those golf courses can be accommodated in a way that will preserve their viability to contribute to the economy.”

While the debate continues over how much water golf courses should be allowed to use, Arizona is facing more and more warnings that the available water supplies appear insufficient to support all the new subdivisions that are springing up and planned in the state’s rapidly growing cities and suburbs.

Ferris, the former director of the Department of Water Resources, coauthored a report on the subject this year with Sarah Porter, director of Arizona State University’s Kyl Center for Water Policy. They warned that groundwater has been seriously overallocated in areas where aquifers are regulated, allowing for unsustainable pumping that they said threatens the state’s water future.

Ferris and Porter said the state’s leaders need to reform groundwater rules to safeguard desert aquifers and prevent water levels from continuing to decline in many areas.

Ferris helped draft the state’s 1980 Groundwater Management Act and later became director of the Department of Water Resources. Now a senior research fellow at ASU, Ferris said she thinks the department’s proposal makes sense, and she has followed the golf group’s opposition to it.

“I’m dismayed that we’re seeing this kind of pushback from a number of folks,” Ferris said. “It’s sort of indicative of a lack of understanding of how critical the water issues we face are, and that it’s going to take everybody doing their part to ensure that we have sustainable water supplies moving forward.”

Ferris pointed out that representatives of the agriculture industry, which accounts for a large portion of groundwater pumping in regulated areas, have also banded together to press their case as officials consider what allocations to adopt in the groundwater plans.

“There just seems to be a lack of understanding among a number of different groups that we are facing a very difficult time in Arizona’s history, and we can’t go on with business as usual,” she said. “You know, everybody thinks they’re special. But nobody is going to be very special when we run out of water.”