What was found in Anza'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-Nitrite | 11700 µg/L 117% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: RAMONA WATER COMPANY · 250 people · 2018
Highest in the city: 774000 µg/L — ANZA PINES MOBILE HOME PARK · 90 people · 2018 | 3/5 | SYR4 |
| Nitrate | 12000 µg/L 120% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: RAMONA WATER COMPANY · 250 people · 2019 | 4/5 | SYR4 |
| Fluoride | 566.5 µg/L 14% of the EPA limit 4000 µg/L Main supplier: RAMONA WATER COMPANY · 250 people · 2018
Highest in the city: 1800 µg/L — Santa Rosa Reservation · 185 people · 2017 | 5/5 | SYR4 |
| Barium | 836 µg/L 42% of the EPA limit 2000 µg/L Highest in the city: ANZA PINES MOBILE HOME PARK · 90 people · 2018 | 1/5 | SYR4 |
| Copper | 430 µg/L 33% of the EPA limit 1300 µg/L Highest in the city: ANZA PINES MOBILE HOME PARK · 90 people · 2018 | 1/5 | SYR4 |
| Chromium | 140 µg/L 140% of the EPA limit, at the 95th percentile of samples — 100 µg/L Main supplier: RAMONA WATER COMPANY · 250 people · 2018 | 1/5 | SYR4 |
| TTHM | 27.145 µg/L 34% of the EPA limit 80 µg/L Highest in the city: OLIVET UNIVERSITY · 212 people · 2018 | 2/5 | SYR4 |
| Combined Uranium | 23.84 µg/L 79% of the EPA limit 30 µg/L Main supplier: RAMONA WATER COMPANY · 250 people · 2019 | 2/5 | SYR4 |
| Bromoform | 19.295 µg/L No EPA limit set Highest in the city: OLIVET UNIVERSITY · 212 people · 2018 | 1/5 | SYR4 |
| Selenium | 13.64 µg/L 27% of the EPA limit 50 µg/L Main supplier: RAMONA WATER COMPANY · 250 people · 2018 | 2/5 | SYR4 |
| Arsenic | 12.3 µg/L 123% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the city: Santa Rosa Reservation · 185 people · 2019 | 1/5 | SYR4 |
| Lead | 9.91 µg/L 66% of the EPA limit 15 µg/L Highest in the city: ANZA PINES MOBILE HOME PARK · 90 people · 2018 | 1/5 | SYR4 |
| 1,1-Dichloroethylene | 8.375 µg/L 120% of the EPA limit, at the 95th percentile of samples — 7 µg/L Main supplier: RAMONA WATER COMPANY · 250 people · 2019 | 1/5 | SYR4 |
| Dibromoacetic Acid | 5.73 µg/L No EPA limit set Highest in the city: OLIVET UNIVERSITY · 212 people · 2018 | 1/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 5.73 µg/L 9.6% of the EPA limit 60 µg/L Highest in the city: OLIVET UNIVERSITY · 212 people · 2018 | 1/5 | SYR4 |
| Toluene | 4.7 µg/L 0.5% of the EPA limit 1000 µg/L Main supplier: RAMONA WATER COMPANY · 250 people · 2019
Highest in the city: 5.68 µg/L — OLIVET UNIVERSITY · 212 people · 2019 | 2/5 | SYR4 |
| Bromodichloromethane | 3.97 µg/L No EPA limit set Highest in the city: OLIVET UNIVERSITY · 212 people · 2018 | 1/5 | SYR4 |
| Dibromochloromethane | 3.88 µg/L No EPA limit set Highest in the city: OLIVET UNIVERSITY · 212 people · 2018 | 1/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.81 pCi/L 19% of the EPA limit 15 pCi/L Highest in the city: Santa Rosa Reservation · 185 people · 2017 | 1/5 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: RAMONA WATER COMPANY · 250 people · 2022
Highest in the city: 0.0100 mg/L — Santa Rosa Reservation · 185 people · 2025 | 5/5 | 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 Anza
| Supplier | Population served |
|---|---|
| RAMONA WATER COMPANY | 250 |
| ANZA MUTUAL WATER COMPANY | 224 |
| OLIVET UNIVERSITY | 212 |
| Santa Rosa Reservation | 185 |
| ANZA PINES MOBILE HOME PARK | 90 |
Frequently asked questions about Anza tap water
Is Anza tap water safe to drink?
EPA testing detected 20 contaminants in the water serving Anza. 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 Anza?
5 public water suppliers report drinking-water monitoring for Anza, California to the EPA. Each is listed above with its population served.
What contaminants are in Anza's water?
The contaminants EPA monitoring detected in Anza include Nitrate-Nitrite, Nitrate, Fluoride, Barium, Copper. 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.