Are Swamp Coolers Banned in Las Vegas?

No, swamp coolers are not banned in Las Vegas homes. You can still install, run, repair and replace an evaporative cooler at a single-family house anywhere in the valley. What changed is narrower: since Aug. 31, 2023, the Las Vegas Valley Water District (LVVWD) approves no new permits in its service area "for commercial and industrial buildings that plan to use evaporative cooling." The Southern Nevada Water Authority (SNWA), the regional water authority, says plainly of its moratorium: "This restriction does not apply to single-family homes."

The confusion is understandable. In December 2021 a wire story ran nationwide under the headline "Drought-stricken Las Vegas proposes grass ban for new homes," and the same story said swamp coolers would be prohibited "at the new developments." Below is what the adopted rule says, quoted from the Water District's Service Rules effective January 1, 2026, and what it means for a homeowner.

Who the rule covers, at a glance

One limit on that first row: the Service Rules themselves speak of "development equipped with evaporative cooling" and never list building types. The scope comes from the District's conservation page (commercial and industrial buildings) and SNWA's laws page (not single-family homes). Neither page mentions apartments or townhomes by name, so a developer of multifamily housing should get an answer from LVVWD in writing before designing around a cooler.

What the Service Rules actually say

The rule sits in Section 3.10, "Non-Essential Water Uses," of the LVVWD Service Rules effective January 1, 2026, alongside man-made lakes, ornamental water features and new golf courses. Item i reads:

"The District will not serve development equipped with evaporative cooling if the following conditions have not been satisfied: a. The property applied for its building permit by close of business September 1, 2023; b. The property's building permit was issued by close of business February 1, 2024, by their respective governing agency; and c. The property received its temporary certificate of occupancy, certificate of occupancy or certificate of completion by close of business February 1, 2026."

All three dates have to be met: a project that applied in August 2023 but had no certificate of occupancy by Feb. 1, 2026 does not qualify. The same three dates appear again in Section 2, where they decide whether a conditional water commitment for "buildings with evaporative cooling" becomes final. That is the enforcement point: no final commitment, no water service.

Definition 39 matters as much as the dates. It says evaporative cooling "refers to any type of cooling technology, device or equipment that utilizes the evaporation of water as part of the cooling process. Evaporative coolers include, but are not limited to, swamp coolers and cooling towers, but do not include misting systems." So a cooling tower on a large building counts, and a restaurant patio mister does not. Our guide to outdoor patio evaporative coolers explains how pad coolers and misters differ.

Replacing a grandfathered system

A business that met the dates keeps its cooling when the equipment wears out. Items 2 and 3 of the rule allow two things. Tenant improvements in a shell building permitted under the dates "may equip their space(s) with evaporative cooling." And existing systems "may be replaced with evaporative cooling as long as" two conditions hold:

1. No added load. "The replacement unit(s) does not increase the originally permitted evaporative cooling load of the existing development."
2. Approval first. "The proposed replacement system receives approval by the Southern Nevada Water Authority's Conservation Division before installation."

This follows the section's preamble: non-conforming uses "may not be enlarged, increased or extended." For how commercial systems are sized, see commercial and warehouse evaporative cooling.

Why the 2021 headlines said "new homes"

The rumor started with an Associated Press report dated Dec. 21, 2021, reprinted widely, including by DRG News the next day. Its headline was about grass: "Drought-stricken Las Vegas proposes grass ban for new homes." In the body, it reported that SNWA "passed resolutions on Monday (Dec. 20, 2021) to prohibit the yards and the use of evaporative cooling machines also known as swamp coolers at the new developments." It also said the moves "must be approved by local governments to go into effect."

Readers merged headline and body into "Las Vegas bans swamp coolers in new homes." Two facts undo that. First, the resolutions needed local governments to adopt them before they took effect; they were not rules in force. Second, the adopted version is aimed at commercial and industrial buildings, and SNWA says single-family homes are excluded. The grass part of the story did reach homes: for new development since April 5, 2022, the Service Rules prohibit grass and spray irrigation at all new properties, "including single-family residential properties." The cooler part did not.

The rule was also challenged. In 2025, Great Basin Water Network reported on AB385, a bill in the Nevada Legislature that would prevent local governments from prohibiting businesses that use evaporative cooling. The Service Rules dated January 1, 2026 still carry the evaporative cooling restriction in full.

Why Southern Nevada targeted evaporative cooling

Both LVVWD and SNWA give the same reason: evaporative cooling is "Southern Nevada's second largest consumptive use of water, exhausting nearly 10 percent of Southern Nevada's Colorado River allocation annually." The key word is consumptive. The District draws the same line for golf courses: unlike water used indoors, water that evaporates "cannot be reclaimed and returned to Lake Mead."

The trade-off is electricity. KTNV reported in 2023 on businesses facing higher energy bills, quoting Ken Goodrich, who said refrigerated systems "will use 3 to 5 times more energy" and "require modifying the buildings with more insulation." SNWA offsets part of that for businesses that convert: its Water Efficient Technologies program covers 50 percent of project cost or $1,500 per ton of capacity, whichever is less, for a switch to air-cooled mechanical systems, and 50 percent or $475 per ton (plus $550 per ton while funds last) for hybrid cooling. The program is for commercial and multifamily owners only; residential customers are excluded, as our swamp cooler rebates by utility roundup notes.

What a Las Vegas homeowner should actually do

Permits for a replacement

Building codes still apply. The City of Las Vegas homeowner permit guide exempts only portable coolers placed in a window, so a fixed rooftop swap is not on its exempt list, and unincorporated Clark County runs its own building department. Our permit guide by city has the details.

How much water your cooler uses

Evaporation is roughly CFM times the temperature drop divided by 8,186. A 4,500 CFM cooler cutting 105 F air by 25 F evaporates about 4,500 x 25 / 8,186 = 13.7 gallons per hour. Add 50 percent bleed-off and it is about 20.6 gallons per hour, or roughly 206 gallons over a 10 hour afternoon. Our swamp cooler water usage guide and the water usage calculator run the numbers for your unit.

Cutting that use

The University of Arizona's Water Wise program gives Arizona households "Cool Rules" that apply equally in Las Vegas:

• Delay turning the cooler on until the outside temperature reaches 85 degrees rather than 79 degrees. Water Wise says: "You will use 50% less water."
• In the evenings, run the fan without the water pump, which moves air through the house "without using any water."
• Install a thermostat so the cooler runs only when needed. Options are covered in swamp cooler thermostats and controls.
• Adjust the bleed-off valve "to drain no more water than is necessary." Do not shut it off entirely, since bleed is what keeps scale off the pads; see bleed-off and water quality for how to set it.
• Check the float valve: one that sticks lets water "run continuously, causing water to overflow the tray and be wasted."

Whether a cooler still makes sense

Las Vegas remains good cooler country: on design conditions of about 106 F with a 66 F coincident wet bulb, rigid media delivers about 71 F supply air, a "good" rating in our best climates for swamp coolers table. On humid monsoon days, the tactics in swamp coolers during monsoon season apply.

Where this answer stops applying

• Other water providers. The Service Rules quoted here are LVVWD's. The District says most of its accounts are in the City of Las Vegas or Clark County. Henderson, North Las Vegas and Boulder City have their own codes, and SNWA says local jurisdictions are "adopting and enacting this measure into regulatory codes, ordinances, and policies." A business there should check with its own city.
• Future changes. This page reflects the Service Rules effective January 1, 2026 and the LVVWD and SNWA pages as checked in October 2026. The District has already scheduled further limits, such as a 2027 ban on watering decorative grass with Colorado River water.