What was found in Inyokern'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 | 3553.6 µg/L 36% of the EPA limit 10000 µg/L Main supplier: INYOKERN CSD · 878 people · 2019
Highest in the city: 9130 µg/L — SIERRA BREEZE MUTUAL WATER COMPANY · 150 people · 2019 | 9/10 | SYR4 |
| Nitrate-Nitrite | 2900 µg/L 29% of the EPA limit 10000 µg/L Main supplier: INYOKERN CSD · 878 people · 2018
Highest in the city: 8100 µg/L — SIERRA BREEZE MUTUAL WATER COMPANY · 150 people · 2017 | 4/10 | SYR4 |
| Fluoride | 715.5 µg/L 18% of the EPA limit 4000 µg/L Main supplier: INYOKERN CSD · 878 people · 2018
Highest in the city: 1580 µg/L — WEST VALLEY MUTUAL WATER COMPANY · 70 people · 2018 | 10/10 | SYR4 |
| Barium | 37 µg/L 1.9% of the EPA limit 2000 µg/L Main supplier: INYOKERN CSD · 878 people · 2018
Highest in the city: 136 µg/L — SIERRA BREEZE MUTUAL WATER COMPANY · 150 people · 2019 | 10/10 | SYR4 |
| Cadmium | 60 µg/L 1200% of the EPA limit, at the 95th percentile of samples — 5 µg/L Highest in the city: CHINA LAKE ACRES MUTUAL WATER COMPANY · 198 people · 2018 | 1/10 | SYR4 |
| TTHM | 6.66 µg/L 8.3% of the EPA limit 80 µg/L Main supplier: INYOKERN CSD · 878 people · 2019
Highest in the city: 35.05 µg/L — WEST VALLEY MUTUAL WATER COMPANY · 70 people · 2017 | 2/10 | SYR4 |
| Total Haloacetic Acids (HAA5) | 26.95 µg/L 45% of the EPA limit 60 µg/L Highest in the city: WEST VALLEY MUTUAL WATER COMPANY · 70 people · 2017 | 1/10 | SYR4 |
| Chromium | 26 µg/L 26% of the EPA limit 100 µg/L Highest in the city: EAST INYOKERN MUTUAL WATER · 87 people · 2018 | 2/10 | SYR4 |
| Copper | 17 µg/L 1.3% of the EPA limit 1300 µg/L Highest in the city: EAST INYOKERN MUTUAL WATER · 87 people · 2018 | 1/10 | SYR4 |
| Lead | 15.455 µg/L 103% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the city: CHINA LAKE ACRES MUTUAL WATER COMPANY · 198 people · 2018 | 3/10 | SYR4 |
| Trichloroacetic Acid | 14.525 µg/L No EPA limit set Highest in the city: WEST VALLEY MUTUAL WATER COMPANY · 70 people · 2017 | 1/10 | SYR4 |
| Dibromochloromethane | 1.765 µg/L No EPA limit set Main supplier: INYOKERN CSD · 878 people · 2019
Highest in the city: 12.41 µg/L — WEST VALLEY MUTUAL WATER COMPANY · 70 people · 2017 | 2/10 | SYR4 |
| Bromodichloromethane | 11.365 µg/L No EPA limit set Highest in the city: WEST VALLEY MUTUAL WATER COMPANY · 70 people · 2017 | 1/10 | SYR4 |
| Chloroform | 9.86 µg/L No EPA limit set Highest in the city: WEST VALLEY MUTUAL WATER COMPANY · 70 people · 2017 | 1/10 | SYR4 |
| Combined Uranium | 8.68774 µg/L 29% of the EPA limit 30 µg/L Highest in the city: OWENS PEAK WEST · 79 people · 2019 | 5/10 | SYR4 |
| Bromoform | 5 µg/L No EPA limit set Main supplier: INYOKERN CSD · 878 people · 2019 | 2/10 | SYR4 |
| Dibromoacetic Acid | 4.5 µg/L No EPA limit set Highest in the city: WEST VALLEY MUTUAL WATER COMPANY · 70 people · 2017 | 1/10 | SYR4 |
| Arsenic | 2.1 µg/L 21% of the EPA limit 10 µg/L Main supplier: INYOKERN CSD · 878 people · 2018
Highest in the city: 2.94 µg/L — CHINA LAKE ACRES MUTUAL WATER COMPANY · 198 people · 2018 | 10/10 | SYR4 |
| Dichloroacetic Acid | 2.9 µg/L No EPA limit set Highest in the city: WEST VALLEY MUTUAL WATER COMPANY · 70 people · 2017 | 1/10 | SYR4 |
| Selenium | 2.9 µg/L 5.8% of the EPA limit 50 µg/L Highest in the city: CHINA LAKE ACRES MUTUAL WATER COMPANY · 198 people · 2018 | 1/10 | SYR4 |
| Beryllium, Total | 1.5 µg/L 38% of the EPA limit 4 µg/L Highest in the city: 148 EAST WATER SYSTEM · 36 people · 2018 | 1/10 | SYR4 |
| Nitrite | 1.5 µg/L 0.2% of the EPA limit 1000 µg/L Highest in the city: EAST INYOKERN MUTUAL WATER · 87 people · 2019 | 1/10 | SYR4 |
| Monochloroacetic Acid | 1.4 µg/L No EPA limit set Highest in the city: WEST VALLEY MUTUAL WATER COMPANY · 70 people · 2017 | 1/10 | SYR4 |
| Mercury | 0.6500 µg/L 33% of the EPA limit 2 µg/L Highest in the city: EAST INYOKERN MUTUAL WATER · 87 people · 2018 | 2/10 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: INYOKERN CSD · 878 people · 2025
Highest in the city: 0.0042 mg/L — WEST VALLEY MUTUAL WATER COMPANY · 70 people · 2025 | 10/10 | 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 Inyokern
| Supplier | Population served |
|---|---|
| INYOKERN CSD | 878 |
| CHINA LAKE ACRES MUTUAL WATER COMPANY | 198 |
| SIERRA BREEZE MUTUAL WATER COMPANY | 150 |
| EAST INYOKERN MUTUAL WATER | 87 |
| OWENS PEAK WEST | 79 |
| WEST VALLEY MUTUAL WATER COMPANY | 70 |
| SWEET WATER CO-OP | 47 |
| 148 EAST WATER SYSTEM | 36 |
| LIFE WATER CO-OP | 35 |
| SOUTH DESERT MUTUAL WATER COMPANY | 28 |
Frequently asked questions about Inyokern tap water
Is Inyokern tap water safe to drink?
EPA testing detected 25 contaminants in the water serving Inyokern. 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 Inyokern?
10 public water suppliers report drinking-water monitoring for Inyokern, California to the EPA. Each is listed above with its population served.
What contaminants are in Inyokern's water?
The contaminants EPA monitoring detected in Inyokern include Nitrate, Nitrate-Nitrite, Fluoride, Barium, Cadmium. 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.