What was found in Boulder City's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 939 µg/L 9.4% of the EPA limit 10000 µg/L Highest in the city: NPS ECHO BAY · 274 people · 2019 | 2/4 | SYR4 |
| Nitrate-Nitrite | 500.8 µg/L 5% of the EPA limit 10000 µg/L Highest in the city: NPS CALLVILLE BAY · 250 people · 2018 | 2/4 | SYR4 |
| Fluoride | 356.4 µg/L 8.9% of the EPA limit 4000 µg/L Highest in the city: NPS ECHO BAY · 274 people · 2019 | 2/4 | SYR4 |
| Copper | 242.6 µg/L 19% of the EPA limit 1300 µg/L Highest in the city: NPS CALLVILLE BAY · 250 people · 2019 | 2/4 | SYR4 |
| Nitrite | 213 µg/L 21% of the EPA limit 1000 µg/L Highest in the city: NPS ECHO BAY · 274 people · 2017 | 1/4 | SYR4 |
| Barium | 131.55 µg/L 6.6% of the EPA limit 2000 µg/L Highest in the city: NPS ECHO BAY · 274 people · 2019 | 2/4 | SYR4 |
| TTHM | 78 µg/L 98% of the EPA limit 80 µg/L Main supplier: BOULDER CITY · 15,000 people · 2019
Highest in the city: 89.54 µg/L — NPS CALLVILLE BAY · 250 people · 2019 | 4/4 | SYR4 |
| Lithium | 58.6 µg/L No EPA limit set Main supplier: BOULDER CITY · 15,000 people · 2025 | 1/4 | UCMR-5 |
| Chloroform | 40.65 µg/L No EPA limit set Main supplier: BOULDER CITY · 15,000 people · 2019
Highest in the city: 45.195 µg/L — NPS CALLVILLE BAY · 250 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 38.65 µg/L 64% of the EPA limit 60 µg/L Main supplier: BOULDER CITY · 15,000 people · 2019 | 4/4 | SYR4 |
| Bromodichloromethane | 23 µg/L No EPA limit set Main supplier: BOULDER CITY · 15,000 people · 2019
Highest in the city: 25.285 µg/L — NPS CALLVILLE BAY · 250 people · 2019 | 4/4 | SYR4 |
| Dichloroacetic Acid | 21.3 µg/L No EPA limit set Main supplier: BOULDER CITY · 15,000 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 15 µg/L No EPA limit set Main supplier: BOULDER CITY · 15,000 people · 2019
Highest in the city: 21.01 µg/L — NPS CALLVILLE BAY · 250 people · 2019 | 4/4 | SYR4 |
| Xylenes, Total | 13.804 µg/L 0.1% of the EPA limit 10000 µg/L Highest in the city: NPS CALLVILLE BAY · 250 people · 2019 | 1/4 | SYR4 |
| Trichloroacetic Acid | 11 µg/L No EPA limit set Main supplier: BOULDER CITY · 15,000 people · 2019
Highest in the city: 11.08 µg/L — NPS ECHO BAY · 274 people · 2019 | 4/4 | SYR4 |
| Dibromoacetic Acid | 4.3 µg/L No EPA limit set Main supplier: BOULDER CITY · 15,000 people · 2019
Highest in the city: 7.103 µg/L — NPS ECHO BAY · 274 people · 2019 | 4/4 | SYR4 |
| Selenium | 5.606 µg/L 11% of the EPA limit 50 µg/L Highest in the city: NPS CALLVILLE BAY · 250 people · 2019 | 2/4 | SYR4 |
| Chromium | 5.5565 µg/L 5.6% of the EPA limit 100 µg/L Highest in the city: NPS CALLVILLE BAY · 250 people · 2019 | 2/4 | SYR4 |
| Monobromoacetic Acid | 1.6 µg/L No EPA limit set Main supplier: BOULDER CITY · 15,000 people · 2019
Highest in the city: 5.212 µg/L — NPS ECHO BAY · 274 people · 2019 | 4/4 | SYR4 |
| Arsenic | 4.501 µg/L 45% of the EPA limit 10 µg/L Highest in the city: NPS ECHO BAY · 274 people · 2019 | 2/4 | SYR4 |
| Monochloroacetic Acid | 3 µg/L No EPA limit set Main supplier: BOULDER CITY · 15,000 people · 2019
Highest in the city: 4.2445 µg/L — NPS ECHO BAY · 274 people · 2019 | 4/4 | SYR4 |
| Combined Uranium | 4.24 µg/L 14% of the EPA limit 30 µg/L Highest in the city: NPS ECHO BAY · 274 people · 2016 | 2/4 | SYR4 |
| Bromoform | 2.43 µg/L No EPA limit set Main supplier: BOULDER CITY · 15,000 people · 2019
Highest in the city: 3.814 µg/L — NPS CALLVILLE BAY · 250 people · 2019 | 4/4 | SYR4 |
| Antimony, Total | 2.918 µg/L 49% of the EPA limit 6 µg/L Highest in the city: NPS CALLVILLE BAY · 250 people · 2019 | 2/4 | SYR4 |
| Gross Beta Particle Activity | 2.26 pCi/L No EPA limit set Highest in the city: NPS ECHO BAY · 274 people · 2016 | 2/4 | SYR4 |
| Ethylbenzene | 1.65 µg/L 0.2% of the EPA limit 700 µg/L Highest in the city: NPS CALLVILLE BAY · 250 people · 2019 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Highest in the city: NPS CALLVILLE BAY · 250 people · 2016 | 2/4 | SYR4 |
| Dalapon | 1.0814 µg/L 0.5% of the EPA limit 200 µg/L Highest in the city: NPS CALLVILLE BAY · 250 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0024 mg/L 16% of the EPA limit 0.0150 mg/L Main supplier: BOULDER CITY · 15,000 people · 2024
Highest in the city: 0.0035 mg/L — NPS ECHO BAY · 274 people · 2025 | 4/4 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Boulder City
| Supplier | Population served |
|---|---|
| BOULDER CITY | 15,000 |
| NPS BOULDER BEACH | 690 |
| NPS ECHO BAY | 274 |
| NPS CALLVILLE BAY | 250 |
Frequently asked questions about Boulder City tap water
Is Boulder City tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Boulder City. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Boulder City?
4 public water suppliers report drinking-water monitoring for Boulder City, Nevada to the EPA. Each is listed above with its population served.
What contaminants are in Boulder City's water?
The contaminants EPA monitoring detected in Boulder City include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Nitrite. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.