Is Laughlin tap water safe to drink?
Laughlin's water skips Lake Mead entirely. It comes straight out of the Colorado River below Davis Dam, through a small district with its own treatment plant and its own yearly report.
Colorado River water, treated in Laughlin
The district’s report traces virtually all of its supply to Rocky Mountain snowmelt. It draws that water through an intake in the river below Davis Dam and treats it at the Big Bend Water Treatment Facility: ozone first, to kill microscopic organisms, then multistage filtration, then sodium hypochlorite so the water stays protected in the pipes, along with corrosion control. The report also points out that relatively little farming upstream limits exposure to agricultural runoff.
How often Big Bend tests
The Las Vegas Valley Water District, which runs the system, says it tests for more than 100 regulated and unregulated substances, and that samples from Big Bend’s water system are collected and analyzed every month, more often and more extensively than the Safe Drinking Water Act requires. Only the regulated substances that were actually detected appear in the main table; the full analysis, including the long list of pesticides and solvents that came back below detection, sits in the summary. Nevada’s assessment of how exposed the river intake is to contamination is available through the district too.
Big Bend’s 2025 results, line by line
Regulated substances come from the district’s annual report. The taste-and-look guidelines and the minerals with no limit come from the separate water quality summary it publishes for the same year.
Substances with a legal limit
| Substance | Level found | Legal limit | Share of limit | Usual source |
|---|---|---|---|---|
| Total trihalomethanes | 37 to 66 ppb (highest yearly average at one site 61) | 80 ppb | 76% of the limit | Byproduct of drinking water disinfection. |
| Copper | 0.57 ppm (90th percentile), range 0.06 to 0.59 | 1.3 ppm | 44% of the limit | Corrosion of household plumbing; erosion of natural deposits. 21 home tap samples, June to September 2025. |
| Bromate | 1.6 to 10 ppb (highest running yearly average 4.3) | 10 ppb | 43% of the limit | Byproduct of ozone disinfection. One reading reached the limit of 10; the report says single readings that high are allowed as long as the running yearly average stays under it. |
| Haloacetic acids | 4.2 to 25 ppb (highest yearly average at one site 23) | 60 ppb | 38% of the limit | Byproduct of drinking water disinfection. |
| Turbidity (cloudiness) | highest reading 0.1 NTU; 100% of samples under 0.3 NTU | 0.3 NTU | 33% of the limit | Soil runoff. Highest reading on December 20, 2025. |
| Alpha particles | 4.9 pCi/L | 15 pCi/L | 33% of the limit | Erosion of natural deposits. Measured where water enters the system. |
| Free chlorine | 0.09 to 1.5 ppm (highest running yearly average 0.80) | 4 ppm | 20% of the limit | Water additive used to control microbes. |
| Arsenic | 1.1 to 1.7 ppb (average 1.4) | 10 ppb | 17% of the limit | Erosion of natural deposits. |
| Uranium | 3.6 to 4.3 ppb (average 3.9) | 30 ppb | 14% of the limit | Erosion of natural deposits. |
| Lead | 1.9 ppb (90th percentile), range 0.3 to 5.4 | 15 ppb | 13% of the limit | Corrosion of household plumbing; erosion of natural deposits. 21 home tap samples, June to September 2025. |
| Fluoride | 0.29 to 0.34 ppm (average 0.32) | 4 ppm | 9% of the limit | Erosion of natural deposits. |
| Nitrate (as nitrogen) | 0.35 to 0.64 ppm (average 0.51) | 10 ppm | 6% of the limit | Fertilizer runoff; septic tanks and sewage; erosion of natural deposits. |
| Selenium | 1.9 to 3.0 ppb (average 2.6) | 50 ppb | 6% of the limit | Erosion of natural deposits; mines; petroleum. |
| Barium | 0.1 ppm | 2 ppm | 5% of the limit | Erosion of natural deposits; metal refineries; drilling wastes. |
Taste, smell and look (guideline levels, not enforced)
| Substance | Level found | Guideline | Usual source |
|---|---|---|---|
| Total dissolved solids | average 607 ppm | 1000 ppm | Dissolved minerals. From the district's water quality summary. |
| Sulfate | average 219 ppm | 500 ppm | From the district's water quality summary. |
| Chloride | average 102 ppm | 400 ppm | From the district's water quality summary. |
| Magnesium | average 24.7 ppm | 150 ppm | From the district's water quality summary. |
| pH | average 8.1 pH units | 6.5 to 8.5 pH units | From the district's water quality summary. |
Other measurements (no legal limit)
| Substance | Level found | Usual source |
|---|---|---|
| Hardness | average 284 ppm (17 grains per gallon) | Calcium and magnesium dissolved from rock. From the district's water quality summary. |
| Sodium | average 95 ppm | From the district's water quality summary; monitoring only, no legal limit. |
| Calcium | average 73 ppm | From the district's water quality summary. |
| Perchlorate | average 1.4 ppb | From the district's water quality summary. |
| Lithium | 45 to 59 ppb (average 49) | Naturally occurring metal. All 29 PFAS in the same round were not detected. |
Source: Big Bend Water District, annual water quality report and water quality summary, published 2026 (2025 data). The district's report lists no violations and says the water it delivers meets or surpasses all state of Nevada and federal drinking-water standards. Last checked 22 October 2026. These are the utility's own figures; we don't produce or adjust them.
What the numbers say:
- Total trihalomethanes, the chlorine byproduct, had the highest share of its limit: a running average of 61 ppb at the worst sampling site, against 80.
- Bromate, a byproduct of disinfecting with ozone, reached 10 ppb in one reading, the limit itself. The limit is judged on the running yearly average, which peaked at 4.3. The report notes that bromate above the limit over many years may raise cancer risk for some people; ask your doctor if you have questions about it.
- Lead and copper at home taps were low: 1.9 ppb lead and 0.57 ppm copper at the 90th percentile, across 21 samples in summer 2025. The district says it has certified that its system has no lead or galvanized-requiring-replacement service lines.
Sodium and dissolved solids in Laughlin water
Here Laughlin stands out. The summary lists sodium at 95 ppm, a figure the state requires the district to monitor but sets no limit for, and total dissolved solids at 607 ppm, under Nevada’s taste-based guideline of 1,000. Sulfate (219) and chloride (102) also sit well inside their guidelines, and the pH is 8.1.
Those minerals give the water a firm taste, but they are not a safety finding. If you’re on a low-sodium diet, ask your doctor whether 95 ppm matters for you, and remember that a salt-based softener adds more; our page on sodium from a softener works out how much.
Laughlin water hardness
The district’s summary gives an average hardness of 284 ppm, which it lists as 17 grains per gallon, made up mostly of calcium (73 ppm) and magnesium (24.7 ppm). That is well past the 180 mg/L where the U.S. Geological Survey’s “very hard” class begins, and a softener should be set to 17. The Laughlin water softener guide has sizes and salt use for that figure.
What Laughlin households can do
- For scale, a softener is the tool; it changes nothing about safety.
- For the mineral or salty taste, an under-sink system is the usual answer; see reverse osmosis in Las Vegas for what it takes out.
- For an older home, flush the tap after water has sat for hours before drinking, and test if you’re worried about the fixtures.
The district also posts separate summaries for the other small systems it runs. Every one, with its hardness by ZIP code, is in our Southern Nevada ZIP lookup; valley residents should start with is Las Vegas tap water safe to drink.
Sources for this page
- Big Bend Water District, operated by the Las Vegas Valley Water District · annual water quality report · 2026 (2025 data) · checked 22 October 2026 · regulated results, standards statement, water source and treatment, bromate note, lead and copper sampling, service lines, PFAS and lithium monitoring, fluoride source.
- Big Bend Water District · water quality summary · 2026 (2025 data) · checked 22 October 2026 · hardness, calcium, magnesium, sodium, dissolved solids, sulfate, chloride, pH and Nevada secondary standards.
- City of Henderson Department of Utility Services · annual water quality report · 2026 (2025 data) · fluoride listed as an additive, standards met.
- Las Vegas Valley Water District and City of Boulder City · annual water quality reports · 2026 (2025 data) · standards met (FAQ on Nevada tap water).
- U.S. Geological Survey · Water Science School page on hardness · checked 22 October 2026 · “very hard” above 180 mg/L.
Questions we get asked
- Is Nevada tap water OK to drink?
- Each Nevada water system answers for itself in a yearly report. In the south of the state, Laughlin's district, the Las Vegas Valley Water District, Henderson and Boulder City all reported meeting the standards for 2025.
- Is Laughlin water fluoridated?
- The district's report lists fluoride at 0.29 to 0.34 ppm and gives erosion of natural deposits as its only source, unlike Henderson's report, which lists it as a water additive too.
- Who runs Laughlin's water?
- The Big Bend Water District. The Las Vegas Valley Water District operates it and produces its reports, but the two are separate systems with separate water sources.
- Does Laughlin water contain PFAS?
- Not in 2025's federal monitoring round, according to the district: all 29 PFAS it tested were not detected. Lithium, also on that list, measured 45 to 59 ppb.