Las Vegas water quality, test by test

How the valley gets its water

About 90 percent comes from Lake Mead. The district’s report traces nearly all of it to Rocky Mountain snowmelt carried down the Colorado River, and says it is drawn from deep in the lake, where quality is best, through the low lake level pumping station. The Southern Nevada Water Authority treats it at two plants, Alfred Merritt Smith and River Mountains, with ozone as the main disinfectant, then multistage filtration, then chlorine to protect it in the pipes.

The other 10 percent is groundwater from a deep aquifer under the valley, refilled by rain and snow on the Spring Mountains and Sheep Range. Wells mostly run from April to October, when demand peaks. If you live in the northwest valley, or within a few miles of the district’s offices at Charleston and Valley View, your tap may deliver a blend of the two.

In 2025 the district ran more than 328,000 analyses on more than 67,000 samples, from the lake, its reservoirs and 380 sampling stations around the valley.

Las Vegas tap water quality: the results table

These are the substances the report found in the treated water, set against the federal limit. The report splits results by where they were measured: the pipe network, the district’s wells and the two treatment plants. The table shows the full span across all of them, and the notes say where the highest figure came from.

What stands out:

• Trihalomethanes, a byproduct of chlorine, came closest. One sample reached 83 parts per billion, above the 80 limit, but the limit is judged on each site’s running yearly average, and the highest of those was 72. The report says this is allowed.
• Lead: of 55 home taps sampled from June to September 2025, nine in ten had 2.1 ppb or less, against an action level of 15. The highest single sample was 11.
• Copper: the 90th-percentile figure was 0.82 ppm against 1.3. One home’s sample, at 1.5, was above it, which the rules allow while the 90th percentile stays below.
• Radioactive minerals such as uranium and radium are natural and low. The well figures for radium and arsenic date from 2021 tests, because annual testing wasn’t required.

The report also covers chemicals EPA may regulate later. In 2025 the district found lithium and two PFAS (PFHxA and PFPeA) at a few thousandths of a part per billion. Six other PFAS tested, including PFOA and PFOS, were not detected.

Sodium, dissolved solids and temperature

Minerals with no health limit don’t appear in the main report; the district puts them in its separate water quality summary, published in 2026. From that sheet:

Measured	Average	Nevada guideline
Total dissolved solids	591 ppm	1,000 ppm
Sodium	89 ppm	none
Hardness	280 ppm (16 gpg)	none
Calcium	75 ppm	none
Sulfate	209 ppm	500 ppm
Chloride	98.6 ppm	400 ppm
Water temperature	19 °C (about 66 °F)	none

The guideline column is the State of Nevada’s secondary standard, which is about taste and look, not safety. Hardness at this level leaves scale on fixtures and appliances; our page on Las Vegas water hardness compares every local system. If you add a salt-based softener, it adds sodium on top of the 89 already there; the sodium from a softener page has the figures.

Why Las Vegas tap water can taste off

The district says most complaints are about chlorine. Its trained tasting panel meets weekly and finds chlorine the dominant aroma, plus a “bitter” taste and “dry mouth feel” from it, along with a chalky flavor, a saline mouth feel and sometimes a “dusty” or “musty” note that it ties to the high mineral content. The panel noticed that cold samples smell less of chlorine than room-temperature ones.

The district’s own fixes are cheap: keep a pitcher of tap water in the fridge for a few hours, add a slice of lemon or orange, or use an inexpensive activated carbon filter. It adds that those filters do not remove hardness, minerals, sodium or fluoride. For that, see reverse osmosis in Las Vegas.

Fluoride in Las Vegas water

Yes, it’s fluoridated. The Nevada legislature and Clark County voters required it in 1999 and 2000, and the summary notes fluoridation began in March 2000. Natural water carries about 0.3 mg/L; the water authority adds about 0.4 to bring it to roughly 0.7. The district’s taps averaged 0.65 ppm in 2025, well under the federal limit of 4.0 and Nevada’s secondary standard of 2.0. The state requirement doesn’t apply to groundwater, which had less: 0.12 to 0.50 ppm.

Where does Las Vegas tap water rank?

There is no official Las Vegas water quality ranking. The EPA and the State of Nevada don’t score or rank water systems; they set limits, and each utility reports whether it met them. By that test the district’s answer for 2025 is that it met or surpassed every standard. Lists that rank city water come from private groups using their own methods, so we don’t repeat them here. If you want to compare, set two utilities’ annual reports side by side, substance by substance, as the table above does for this one.

What to do with these numbers

• For scale, the 16 grains per gallon above is the figure to enter on a softener; work out how big a water softener you need from it and your household.
• For taste, start with the fridge pitcher, then a carbon filter; our water filtration options guide sets out what each type removes.
• For safety questions, the valley’s other utilities answer on whether Las Vegas tap water is safe to drink.
• For lead, the district suggests running the tap for 30 seconds to 2 minutes when water has sat for hours, and a private lab test if you are concerned.

Sources for this page

• Las Vegas Valley Water District · annual water quality report · published 2026 (2025 data) · checked 21 October 2026 · every figure in the results table, water sources, treatment, testing counts, lead and copper, unregulated chemicals, fluoride at the tap, lead advice.
• Las Vegas Valley Water District · water quality summary for the valley · published 2026 (2025 data) · checked 21 October 2026 · dissolved solids, sodium, hardness, calcium, sulfate, chloride, temperature, Nevada guidelines, fluoridation start date.
• Las Vegas Valley Water District · water quality questions-and-answers page · current, checked 21 October 2026 · chlorine taste, tasting panel, pitcher and carbon filter tips, fluoride law and dose, lead service lines.