What was found in Castroville'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 | 555000 µg/L 5550% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 3/3 | SYR4 |
| Nitrate | 1130 µg/L 11% of the EPA limit 10000 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019
Highest in the city: 2800 µg/L — GREEN ACRES WA · 56 people · 2019 | 3/3 | SYR4 |
| Fluoride | 900 µg/L 23% of the EPA limit 4000 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 3/3 | SYR4 |
| Barium | 258 µg/L 13% of the EPA limit 2000 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 3/3 | SYR4 |
| Lithium | 40.2 µg/L No EPA limit set Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2025 | 1/3 | UCMR-5 |
| TTHM | 39.36 µg/L 49% of the EPA limit 80 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Bromoform | 32.7 µg/L No EPA limit set Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Arsenic | 23.925 µg/L 239% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 3/3 | SYR4 |
| Chromium | 13 µg/L 13% of the EPA limit 100 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019
Highest in the city: 22 µg/L — GREEN ACRES WA · 56 people · 2014 | 3/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 16.38 µg/L 273% of the EPA limit, at the 95th percentile of samples — 6 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2018 | 1/3 | SYR4 |
| Chloroform | 14.3 µg/L No EPA limit set Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 11.46 µg/L 19% of the EPA limit 60 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Lead | 10.93 µg/L 73% of the EPA limit 15 µg/L Highest in the city: DEL MONTE FARMS RD WS #03 · 55 people · 2018 | 1/3 | SYR4 |
| Dibromoacetic Acid | 8.84 µg/L No EPA limit set Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Copper | 7.95 µg/L 0.6% of the EPA limit 1300 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Dibromochloromethane | 6 µg/L No EPA limit set Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Selenium | 5.455 µg/L 11% of the EPA limit 50 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 2/3 | SYR4 |
| Combined Uranium | 4.917 µg/L 16% of the EPA limit 30 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Toluene | 3.4 µg/L 0.3% of the EPA limit 1000 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Monobromoacetic Acid | 1.955 µg/L No EPA limit set Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Bromodichloromethane | 1.95 µg/L No EPA limit set Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Dichloroacetic Acid | 1 µg/L No EPA limit set Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Nitrite | 0.3850 µg/L 0% of the EPA limit 1000 µg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2019 | 1/3 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CASTROVILLE COMMUNITY SERVICES DISTRICT · 7,515 people · 2025
Highest in the city: 0.0084 mg/L — GREEN ACRES WA · 56 people · 2024 | 3/3 | 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 Castroville
| Supplier | Population served |
|---|---|
| CASTROVILLE COMMUNITY SERVICES DISTRICT | 7,515 |
| GREEN ACRES WA | 56 |
| DEL MONTE FARMS RD WS #03 | 55 |
Frequently asked questions about Castroville tap water
Is Castroville tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Castroville. 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 Castroville?
3 public water suppliers report drinking-water monitoring for Castroville, California to the EPA. Each is listed above with its population served.
What contaminants are in Castroville's water?
The contaminants EPA monitoring detected in Castroville include Nitrate-Nitrite, Nitrate, 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.