Will Colorado River Cuts Affect Your Las Vegas Pool?

Not right now. Nevada’s Colorado River cut for 2027 and 2028 is 50,000 acre-feet a year, and SNWA says it comes out of water the valley already wasn’t using, so there are no new pool rules or restrictions. Existing pools are fine. What does matter is evaporation, because every gallon your pool loses to the sky is a gallon Southern Nevada can’t get back.

Here’s what’s actually happening, and what we’d do about it if it were our pool.

What did the Colorado River deal actually change?

On Aug. 21, the Interior Department released new Colorado River guidelines. Under the proposed split, Arizona, California and Nevada cut deliveries by a combined 1.25 million acre-feet a year in 2027 and 2028. Nevada’s share is 50,000 acre-feet.

That sounds scary. It’s about 16.3 billion gallons.

Here’s the part that didn’t make as many headlines. Nevada gets 300,000 acre-feet a year from the river. SNWA says the valley used about 198,000 in 2025. That leaves a cushion of roughly 102,000 acre-feet, and the cut comes out of that cushion.

SNWA’s deputy general manager, Colby Pellegrino, told KTNV that Southern Nevada can absorb this cut without major changes. SNWA spokesperson Bronson Mack put it even simpler: “Keep doing what we’ve been doing.”

So no, nobody is coming to drain your pool.

Why are people still worried?

Because 2027 is only part of the story.

Nevada and SNWA sued the federal government in August over the longer-term plan. State officials say the worst-case scenarios could cut Southern Nevada’s share by more than 70 percent. Lake Mead hit about 1,039 feet in late August, the lowest since it was filled in the 1930s.

Mack told News 3 the biggest uncertainty for Nevada starts in 2029. That’s when the real fight happens.

We don’t know how that ends. Nobody does. But we do know the valley’s track record. Southern Nevada has spent 20 years getting very good at doing more with less, and pool owners have been part of that.

Are there rules on pools already?

Yes, one big one.

In July 2022, the SNWA board approved a 600-square-foot limit on the surface area of new residential pools, and local water providers and cities adopted matching rules. The average Southern Nevada pool is about 470 square feet, so SNWA says the limit mostly hits the biggest 25 percent of new builds.

If your pool is already in the ground, the limit doesn’t apply to you.

A few other rules you probably already follow:

• Pool water drains to the sanitary sewer, never the street or storm drain.
• Cartridge filter rinse water goes on plants or gravel, not into the gutter.
• Starting Jan. 1, 2027, Colorado River water can’t irrigate nonfunctional grass on HOA common areas, apartments, commercial and government property. Single-family yards are excluded. Your HOA might be ripping out grass by the clubhouse, but your backyard pool isn’t part of it.

Why does pool evaporation matter so much here?

This one surprises people.

About 40 percent of the valley’s water is used indoors, and SNWA says about 99 percent of that is treated and sent back to Lake Mead. Each gallon returned lets the region pull another gallon out. Your shower water basically gets recycled.

Outdoor water doesn’t. Sprinkler water and pool evaporation are gone for good. That’s why SNWA focuses almost all of its conservation push outside the house.

Now look at your pool. SNWA figures an average pool loses 48.6 gallons per square foot every year to evaporation. For a 470-square-foot pool, that’s about 22,800 gallons a year. A pool at the 600-square-foot max loses about 29,000.

In July, that can be dozens of gallons a day. You don’t see it leave. You just see the auto-fill running a lot.

How can I cut my pool’s water use?

Good news: most of this is cheap or free.

Use a cover. SNWA says a pool cover cuts evaporation by up to 90 percent. It also keeps out dust and holds heat. If you only do one thing on this list, do this one. Yes, they’re a little annoying to pull on and off. So is a $9-per-1,000-gallons excessive use charge.

Block the wind. Wind speeds up evaporation. Shrubs or a low wall on the windy side help. Just skip anything that drops leaves into the water, or we’ll be fishing them out every week.

Don’t overheat it. Warmer water evaporates faster. Pool pros recommend 78 degrees for swimming. If you heat the pool into the 90s in November, the desert air will take its cut.

Keep the water line in range. Splash-out from a water level that’s too high adds up, especially with kids doing cannonballs all afternoon.

Rule out a leak. A leak can look exactly like evaporation. SNWA’s bucket test is simple:

1. Turn off the auto-fill valve.
2. Set a weighted bucket on a pool step, rim a few inches above the water.
3. Fill the bucket so its water level matches the pool’s.
4. Leave both alone for a few hot days, then compare.

If the pool dropped noticeably more than the bucket, you may have a leak. Fall is a decent time to test, but you’ll get a clearer read on a warm, still stretch.

What about my water bill?

Less evaporation means less fresh water coming in through the auto-fill. In Las Vegas, that matters most from Nov. 1 to Feb. 28, when LVVWD’s excessive use threshold drops to its lower winter level.

There’s a bonus for your chemistry too. Our tap water is hard. Every gallon you top off with brings more calcium into the pool. Less evaporation means less scale on your tile line and fewer early drains down the road.

What we’d tell a friend

Don’t panic about the river. Your pool is legal and it isn’t going anywhere.

Do treat evaporation like the real cost it is. A cover, a sensible heater setting and a quick leak check will save thousands of gallons a year. That helps your bill, your water balance and the lake.

That’s a big part of what we look at on our weekly visits. We watch the water level, check the equipment pad for drips and flag anything that looks like a leak before it turns into a bigger repair.

If your pool has been drinking more than it should, or you’d like weekly service in Henderson or Las Vegas, call or text us at (702) 608-5226. We’re open 24/7. You can also find us at summitpoolslv.com.