What was found in Corona'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 | 17000 µg/L 170% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 3/4 | SYR4 |
| Nitrate-Nitrite | 15600 µg/L 156% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 3/4 | SYR4 |
| Fluoride | 820 µg/L 21% of the EPA limit 4000 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019
Highest in the city: 1085 µg/L — GLEN IVY HOT SPRINGS · 1,087 people · 2019 | 3/4 | SYR4 |
| Barium | 364.5 µg/L 18% of the EPA limit 2000 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 1/4 | SYR4 |
| Lithium | 55.1 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2024 | 1/4 | UCMR-5 |
| TTHM | 36 µg/L 45% of the EPA limit 80 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 4/4 | SYR4 |
| Combined Uranium | 30.0235 µg/L 100% of the EPA limit, at the 95th percentile of samples — 30 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 1/4 | SYR4 |
| Selenium | 29.3 µg/L 59% of the EPA limit 50 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 1/4 | SYR4 |
| Arsenic | 14.1 µg/L 141% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 3/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 14 µg/L 23% of the EPA limit 60 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 3/4 | SYR4 |
| Bromoform | 11.55 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 4/4 | SYR4 |
| Chloroform | 11 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 11 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 4/4 | SYR4 |
| Bromodichloromethane | 10 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 4/4 | SYR4 |
| Monochloroacetic Acid | 6.985 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 1/4 | SYR4 |
| Dichloroacetic Acid | 5.765 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 3/4 | SYR4 |
| Lead | 5.7 µg/L 38% of the EPA limit 15 µg/L Highest in the city: GLEN EDEN SUN CLUB · 566 people · 2019 | 1/4 | SYR4 |
| Trichloroacetic Acid | 4.5 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 2/4 | SYR4 |
| Dibromoacetic Acid | 4.3 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 3/4 | SYR4 |
| Chromium | 3.8 µg/L 3.8% of the EPA limit 100 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 1/4 | SYR4 |
| Monobromoacetic Acid | 1.845 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 1/4 | SYR4 |
| Trichloroethylene | 1.765 µg/L 35% of the EPA limit 5 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 1/4 | SYR4 |
| Tetrachloroethylene | 0.9460 µg/L 19% of the EPA limit 5 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 1/4 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0420 µg/L 21% of the EPA limit 0.2000 µg/L Main supplier: CORONA, CITY OF · 168,575 people · 2019 | 1/4 | SYR4 |
| Pfba | 0.0076 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2024 | 1/4 | UCMR-5 |
| Pfpea | 0.0061 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2024 | 1/4 | UCMR-5 |
| Pfhxa | 0.0038 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2024 | 1/4 | UCMR-5 |
| Lead | 0.0037 mg/L 25% of the EPA limit 0.0150 mg/L Main supplier: CORONA, CITY OF · 168,575 people · 2023 | 4/4 | LCR |
| PFHXS | 0.0033 µg/L No EPA limit set Main supplier: CORONA, CITY OF · 168,575 people · 2024 | 1/4 | UCMR-5 |
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 Corona
| Supplier | Population served |
|---|---|
| CORONA, CITY OF | 168,575 |
| HOME GARDENS COUNTY WD | 3,095 |
| GLEN IVY HOT SPRINGS | 1,087 |
| GLEN EDEN SUN CLUB | 566 |
Frequently asked questions about Corona tap water
Is Corona tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Corona. 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 Corona?
4 public water suppliers report drinking-water monitoring for Corona, California to the EPA. Each is listed above with its population served.
What contaminants are in Corona's water?
The contaminants EPA monitoring detected in Corona include Nitrate, Nitrate-Nitrite, Fluoride, Barium, Lithium. 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.