What was found in Castaic'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 | 1253.22 µg/L 13% of the EPA limit 10000 µg/L Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 821 µg/L 8.2% of the EPA limit 10000 µg/L Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2019 | 1/1 | SYR4 |
| Fluoride | 746.5 µg/L 19% of the EPA limit 4000 µg/L Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2019 | 1/1 | SYR4 |
| Lithium | 46.1 µg/L No EPA limit set Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2023 | 1/1 | UCMR-5 |
| TTHM | 23.56 µg/L 29% of the EPA limit 80 µg/L Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2017 | 1/1 | SYR4 |
| Bromoform | 14.9725 µg/L No EPA limit set Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2017 | 1/1 | SYR4 |
| Dibromochloromethane | 6.952 µg/L No EPA limit set Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2017 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 4.997 µg/L 8.3% of the EPA limit 60 µg/L Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2017 | 1/1 | SYR4 |
| Dibromoacetic Acid | 4.829 µg/L No EPA limit set Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2017 | 1/1 | SYR4 |
| Combined Uranium | 4.46106 µg/L 15% of the EPA limit 30 µg/L Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2019 | 1/1 | SYR4 |
| Dichloromethane | 1.705 µg/L 34% of the EPA limit 5 µg/L Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 1.373 µg/L No EPA limit set Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2017 | 1/1 | SYR4 |
| Trichloroacetic Acid | 1.12 µg/L No EPA limit set Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2017 | 1/1 | SYR4 |
| PFOS | 0.0065 µg/L No EPA limit set Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2024 | 1/1 | UCMR-5 |
| PFOA | 0.0050 µg/L No EPA limit set Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2024 | 1/1 | UCMR-5 |
| PFHXS | 0.0031 µg/L No EPA limit set Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2024 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: PETER PITCHESS HONOR RANCHO DETN. CTR · 7,000 people · 2024 | 1/1 | LCR |
Water suppliers serving Castaic
| Supplier | Population served |
|---|---|
| PETER PITCHESS HONOR RANCHO DETN. CTR | 7,000 |
Frequently asked questions about Castaic tap water
Is Castaic tap water safe to drink?
EPA testing detected 17 contaminants in the water serving Castaic. 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 Castaic?
1 public water supplier report drinking-water monitoring for Castaic, California to the EPA. Each is listed above with its population served.
What contaminants are in Castaic's water?
The contaminants EPA monitoring detected in Castaic include Nitrate, Nitrate-Nitrite, Fluoride, Lithium, 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.