What was found in Perris'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 | 871000 µg/L 8710% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2017 | 1/1 | SYR4 |
| Nitrate | 9800 µg/L 98% of the EPA limit 10000 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Barium | 1018 µg/L 51% of the EPA limit 2000 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Fluoride | 380 µg/L 9.5% of the EPA limit 4000 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| TTHM | 60 µg/L 75% of the EPA limit 80 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Lithium | 39 µg/L No EPA limit set Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2024 | 1/1 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 38 µg/L 63% of the EPA limit 60 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 33.3 µg/L No EPA limit set Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Copper | 30.915 µg/L 2.4% of the EPA limit 1300 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 23 µg/L No EPA limit set Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 18 µg/L No EPA limit set Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Bromoform | 15 µg/L No EPA limit set Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Chloroform | 15 µg/L No EPA limit set Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 14.8285 µg/L 49% of the EPA limit 30 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Selenium | 12 µg/L 24% of the EPA limit 50 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Cyanide | 10.05 µg/L 5% of the EPA limit 200 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Arsenic | 10 µg/L 100% of the EPA limit 10 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 9.6 µg/L No EPA limit set Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 9.135 µg/L No EPA limit set Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 8.43 pCi/L No EPA limit set Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 7.345 µg/L No EPA limit set Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Lead | 5.721 µg/L 38% of the EPA limit 15 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 4.98 µg/L No EPA limit set Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Tetrachloroethylene | 2.495 µg/L 50% of the EPA limit 5 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Trichloroethylene | 1.13 µg/L 23% of the EPA limit 5 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Nitrite | 0.4750 µg/L 0% of the EPA limit 1000 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Cadmium | 0.3800 µg/L 7.6% of the EPA limit 5 µg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0028 mg/L 19% of the EPA limit 0.0150 mg/L Main supplier: EASTERN MUNICIPAL WD · 666,581 people · 2025 | 1/1 | 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 Perris
| Supplier | Population served |
|---|---|
| EASTERN MUNICIPAL WD | 666,581 |
Frequently asked questions about Perris tap water
Is Perris tap water safe to drink?
EPA testing detected 28 contaminants in the water serving Perris. 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 Perris?
1 public water supplier report drinking-water monitoring for Perris, California to the EPA. Each is listed above with its population served.
What contaminants are in Perris's water?
The contaminants EPA monitoring detected in Perris include Nitrate-Nitrite, Nitrate, Barium, Fluoride, TTHM. 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.