What was found in Norco'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 | 9718 µg/L 97% of the EPA limit 10000 µg/L Main supplier: NORCO, CITY OF · 25,068 people · 2019 | 1/2 | SYR4 |
| Fluoride | 3100 µg/L 78% of the EPA limit 4000 µg/L Main supplier: NORCO, CITY OF · 25,068 people · 2019 | 1/2 | SYR4 |
| Nitrate-Nitrite | 2690 µg/L 27% of the EPA limit 10000 µg/L Main supplier: NORCO, CITY OF · 25,068 people · 2017 | 1/2 | SYR4 |
| Barium | 168 µg/L 8.4% of the EPA limit 2000 µg/L Main supplier: NORCO, CITY OF · 25,068 people · 2017 | 1/2 | SYR4 |
| TTHM | 49.69 µg/L 62% of the EPA limit 80 µg/L Main supplier: NORCO, CITY OF · 25,068 people · 2019
Highest in the city: 109.94 µg/L — CALIFORNIA REHABILITATION CENTER - NORCO · 4,300 people · 2019 | 2/2 | SYR4 |
| Bromoform | 31.04 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2019
Highest in the city: 80.5 µg/L — CALIFORNIA REHABILITATION CENTER - NORCO · 4,300 people · 2019 | 2/2 | SYR4 |
| Lithium | 35.9 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2024 | 1/2 | UCMR-5 |
| Dibromochloromethane | 13.98 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2019
Highest in the city: 23.595 µg/L — CALIFORNIA REHABILITATION CENTER - NORCO · 4,300 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 18.774 µg/L 63% of the EPA limit 30 µg/L Main supplier: NORCO, CITY OF · 25,068 people · 2017 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 9.9 µg/L 17% of the EPA limit 60 µg/L Main supplier: NORCO, CITY OF · 25,068 people · 2019
Highest in the city: 15.385 µg/L — CALIFORNIA REHABILITATION CENTER - NORCO · 4,300 people · 2019 | 2/2 | SYR4 |
| Arsenic | 15 µg/L 150% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: NORCO, CITY OF · 25,068 people · 2019 | 1/2 | SYR4 |
| Gross Beta Particle Activity | 12 pCi/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2012 | 1/2 | SYR4 |
| Dibromoacetic Acid | 9.18 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2019
Highest in the city: 11.985 µg/L — CALIFORNIA REHABILITATION CENTER - NORCO · 4,300 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 4.58 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2019
Highest in the city: 6.6 µg/L — CALIFORNIA REHABILITATION CENTER - NORCO · 4,300 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 5.355 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2019
Highest in the city: 5.75 µg/L — CALIFORNIA REHABILITATION CENTER - NORCO · 4,300 people · 2019 | 2/2 | SYR4 |
| Chloroform | 5.115 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 2.95 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 2.48 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1.5 µg/L No EPA limit set Highest in the city: CALIFORNIA REHABILITATION CENTER - NORCO · 4,300 people · 2019 | 1/2 | SYR4 |
| Benzene | 0.9520 µg/L 19% of the EPA limit 5 µg/L Main supplier: NORCO, CITY OF · 25,068 people · 2018 | 1/2 | SYR4 |
| PFOS | 0.0314 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2024 | 1/2 | UCMR-5 |
| Pfba | 0.0179 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2024 | 1/2 | UCMR-5 |
| PFHXS | 0.0138 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2024 | 2/2 | UCMR-5 |
| PFOA | 0.0137 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2024 | 1/2 | UCMR-5 |
| PFBS | 0.0122 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2024 | 1/2 | UCMR-5 |
| Pfpea | 0.0119 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2024 | 1/2 | UCMR-5 |
| Pfhxa | 0.0073 µg/L No EPA limit set Main supplier: NORCO, CITY OF · 25,068 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: NORCO, CITY OF · 25,068 people · 2024 | 2/2 | 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 Norco
| Supplier | Population served |
|---|---|
| NORCO, CITY OF | 25,068 |
| CALIFORNIA REHABILITATION CENTER - NORCO | 4,300 |
Frequently asked questions about Norco tap water
Is Norco tap water safe to drink?
EPA testing detected 28 contaminants in the water serving Norco. 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 Norco?
2 public water suppliers report drinking-water monitoring for Norco, California to the EPA. Each is listed above with its population served.
What contaminants are in Norco's water?
The contaminants EPA monitoring detected in Norco include Nitrate, Fluoride, Nitrate-Nitrite, Barium, 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.