What was found in ZIP 93422
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 | 671000 µg/L 6710% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Nitrate | 2938 µg/L 29% of the EPA limit 10000 µg/L Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Fluoride | 331.5 µg/L 8.3% of the EPA limit 4000 µg/L Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Barium | 130 µg/L 6.5% of the EPA limit 2000 µg/L Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| TTHM | 60.85 µg/L 76% of the EPA limit 80 µg/L Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Lithium | 20.7 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2023 | 1/1 | UCMR-5 |
| Dibromochloromethane | 20.26 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 19.1 µg/L 32% of the EPA limit 60 µg/L Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 18.9 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 16.688 µg/L 56% of the EPA limit 30 µg/L Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Chloroform | 15.51 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Selenium | 9.48 µg/L 19% of the EPA limit 50 µg/L Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 9.365 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 8.6 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Bromoform | 8.25 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 3.85 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Arsenic | 3.28 µg/L 33% of the EPA limit 10 µg/L Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 2.68 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Cadmium | 2.51 µg/L 50% of the EPA limit 5 µg/L Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2019 | 1/1 | SYR4 |
| PFOS | 0.0223 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2023 | 1/1 | UCMR-5 |
| Pfba | 0.0100 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2023 | 1/1 | UCMR-5 |
| PFBS | 0.0094 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2023 | 1/1 | UCMR-5 |
| PFOA | 0.0084 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2023 | 1/1 | UCMR-5 |
| PFHXS | 0.0076 µg/L No EPA limit set Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2023 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: ATASCADERO MUTUAL WATER CO · 30,618 people · 2025 | 1/1 | 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 93422
| Supplier | State | Population served |
|---|---|---|
| ATASCADERO MUTUAL WATER CO | CA | 30,618 |
Frequently asked questions about ZIP 93422 tap water
Is the tap water in ZIP 93422 safe to drink?
EPA testing detected 26 contaminants across the water suppliers serving ZIP 93422. 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 93422?
1 public water supplier report EPA drinking-water monitoring for ZIP 93422. Each is listed above with its population served.
What contaminants are in ZIP 93422's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.