What was found in ZIP 93402
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 521250 µg/L 5213% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2017
Highest in the ZIP: 705000 µg/L — GOLDEN STATE WATER COMPANY - LOS OSOS · 5,924 people · 2019 | 2/2 | SYR4 |
| Nitrate | 14300 µg/L 143% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2019
Highest in the ZIP: 17402 µg/L — GOLDEN STATE WATER COMPANY - LOS OSOS · 5,924 people · 2019 | 2/2 | SYR4 |
| Fluoride | 213.5 µg/L 5.3% of the EPA limit 4000 µg/L Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2019
Highest in the ZIP: 226 µg/L — GOLDEN STATE WATER COMPANY - LOS OSOS · 5,924 people · 2019 | 2/2 | SYR4 |
| Barium | 185 µg/L 9.3% of the EPA limit 2000 µg/L Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2019 | 2/2 | SYR4 |
| Copper | 41 µg/L 3.2% of the EPA limit 1300 µg/L Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2019 | 1/2 | SYR4 |
| Chromium | 33.31 µg/L 33% of the EPA limit 100 µg/L Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2019 | 2/2 | SYR4 |
| Lithium | 16.1 µg/L No EPA limit set Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2024 | 2/2 | UCMR-5 |
| TTHM | 7.6 µg/L 9.5% of the EPA limit 80 µg/L Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2019 | 2/2 | SYR4 |
| Lead | 6.4 µg/L 43% of the EPA limit 15 µg/L Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2019 | 1/2 | SYR4 |
| Bromoform | 5.66 µg/L No EPA limit set Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 4.6 µg/L No EPA limit set Highest in the ZIP: GOLDEN STATE WATER COMPANY - LOS OSOS · 5,924 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.77 µg/L 3% of the EPA limit 60 µg/L Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2019
Highest in the ZIP: 4.6 µg/L — GOLDEN STATE WATER COMPANY - LOS OSOS · 5,924 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 2.475 µg/L No EPA limit set Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 1.77 µg/L No EPA limit set Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 0.6200 pCi/L 12% of the EPA limit 5 pCi/L Highest in the ZIP: GOLDEN STATE WATER COMPANY - LOS OSOS · 5,924 people · 2018 | 1/2 | SYR4 |
| Dichloromethane | 0.5000 µg/L 10% of the EPA limit 5 µg/L Highest in the ZIP: GOLDEN STATE WATER COMPANY - LOS OSOS · 5,924 people · 2019 | 1/2 | SYR4 |
| PFBS | 0.0180 µg/L No EPA limit set Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2024 | 2/2 | UCMR-5 |
| Pfpea | 0.0168 µg/L No EPA limit set Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2024 | 2/2 | UCMR-5 |
| Pfhxa | 0.0166 µg/L No EPA limit set Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2024 | 2/2 | UCMR-5 |
| PFOA | 0.0147 µg/L No EPA limit set Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2024 | 1/2 | UCMR-5 |
| PFOS | 0.0117 µg/L No EPA limit set Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2024 | 1/2 | UCMR-5 |
| PFHXS | 0.0084 µg/L No EPA limit set Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2024
Highest in the ZIP: 0.0088 µg/L — GOLDEN STATE WATER COMPANY - LOS OSOS · 5,924 people · 2024 | 2/2 | UCMR-5 |
| Pfba | 0.0060 µg/L No EPA limit set Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2024 | 1/2 | UCMR-5 |
| Pfhpa | 0.0054 µg/L No EPA limit set Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0011 mg/L 7.3% of the EPA limit 0.0150 mg/L Main supplier: LOS OSOS COMMUNITY SERVICES DISTRICT · 7,086 people · 2026 | 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.
Water suppliers serving ZIP 93402
| Supplier | State | Population served |
|---|---|---|
| LOS OSOS COMMUNITY SERVICES DISTRICT | CA | 7,086 |
| GOLDEN STATE WATER COMPANY - LOS OSOS | CA | 5,924 |
Frequently asked questions about ZIP 93402 tap water
Is the tap water in ZIP 93402 safe to drink?
EPA testing detected 25 contaminants across the water suppliers serving ZIP 93402. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 93402?
2 public water suppliers report EPA drinking-water monitoring for ZIP 93402. Each is listed above with its population served.
What contaminants are in ZIP 93402's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Barium, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.