What was found in Eureka'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 | 1600 µg/L 16% of the EPA limit 10000 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019 | 3/4 | SYR4 |
| Nitrate-Nitrite | 1600 µg/L 16% of the EPA limit 10000 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019 | 3/4 | SYR4 |
| Fluoride | 330 µg/L 8.3% of the EPA limit 4000 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019 | 3/4 | SYR4 |
| Barium | 238 µg/L 12% of the EPA limit 2000 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019 | 3/4 | SYR4 |
| Cyanide | 61.5 µg/L 31% of the EPA limit 200 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019 | 2/4 | SYR4 |
| Copper | 33.6 µg/L 2.6% of the EPA limit 1300 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019 | 3/4 | SYR4 |
| Selenium | 31.8 µg/L 64% of the EPA limit 50 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019 | 2/4 | SYR4 |
| Arsenic | 10 µg/L 100% of the EPA limit 10 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019
Highest in the city: 13.9 µg/L — CRESCENT VALLEY WATER SYSTEM · 340 people · 2019 | 3/4 | SYR4 |
| Chromium | 2.65 µg/L 2.7% of the EPA limit 100 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019
Highest in the city: 6.4 µg/L — CRESCENT VALLEY WATER SYSTEM · 340 people · 2018 | 3/4 | SYR4 |
| Combined Uranium | 2 µg/L 6.7% of the EPA limit 30 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2018
Highest in the city: 6 µg/L — CRESCENT VALLEY WATER SYSTEM · 340 people · 2019 | 3/4 | SYR4 |
| TTHM | 2.495 µg/L 3.1% of the EPA limit 80 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2017
Highest in the city: 4.33 µg/L — DEVILS GATE WATER SYSTEM GID 2 · 132 people · 2019 | 4/4 | SYR4 |
| Gross Beta Particle Activity | 2.766 pCi/L No EPA limit set Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2015 | 3/4 | SYR4 |
| Bromoform | 0.9375 µg/L No EPA limit set Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2017
Highest in the city: 2.06 µg/L — DEVILS GATE WATER SYSTEM GID 2 · 132 people · 2019 | 4/4 | SYR4 |
| Antimony, Total | 2 µg/L 33% of the EPA limit 6 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019 | 1/4 | SYR4 |
| Lead | 2 µg/L 13% of the EPA limit 15 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019 | 1/4 | SYR4 |
| Dibromochloromethane | 0.9400 µg/L No EPA limit set Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2017
Highest in the city: 1.58 µg/L — DEVILS GATE WATER SYSTEM GID 2 · 132 people · 2019 | 2/4 | SYR4 |
| Thallium, Total | 1 µg/L 50% of the EPA limit 2 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 0.7712 pCi/L 15% of the EPA limit 5 pCi/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2015
Highest in the city: 0.8780 pCi/L — CRESCENT VALLEY WATER SYSTEM · 340 people · 2016 | 3/4 | SYR4 |
| Bromodichloromethane | 0.4600 µg/L No EPA limit set Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2017
Highest in the city: 0.6430 µg/L — DEVILS GATE WATER SYSTEM GID 2 · 132 people · 2019 | 2/4 | SYR4 |
| Chloroform | 0.1900 µg/L No EPA limit set Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2017 | 1/4 | SYR4 |
| Styrene | 0.0740 µg/L 0.1% of the EPA limit 100 µg/L Main supplier: EUREKA WATER ASSOCIATION · 450 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0050 mg/L 33% of the EPA limit 0.0150 mg/L Main supplier: EUREKA WATER ASSOCIATION · 450 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 Eureka
| Supplier | Population served |
|---|---|
| EUREKA WATER ASSOCIATION | 450 |
| CRESCENT VALLEY WATER SYSTEM | 340 |
| DEVILS GATE WATER SYSTEM GID 2 | 132 |
| DEVILS GATE GID DISTRICT 1 | 65 |
Frequently asked questions about Eureka tap water
Is Eureka tap water safe to drink?
EPA testing detected 22 contaminants in the water serving Eureka. 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 Eureka?
4 public water suppliers report drinking-water monitoring for Eureka, Nevada to the EPA. Each is listed above with its population served.
What contaminants are in Eureka's water?
The contaminants EPA monitoring detected in Eureka include Nitrate, Nitrate-Nitrite, Fluoride, Barium, Cyanide. 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.