What was found in ZIP 93423
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 | 900000 µg/L 9000% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Nitrate | 2300 µg/L 23% of the EPA limit 10000 µg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Fluoride | 245 µg/L 6.1% of the EPA limit 4000 µg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Barium | 105.2 µg/L 5.3% of the EPA limit 2000 µg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| TTHM | 31.54 µg/L 39% of the EPA limit 80 µg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 12.76 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 11.7 µg/L 19% of the EPA limit 60 µg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Selenium | 9 µg/L 18% of the EPA limit 50 µg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 8.8 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Bromoform | 8.3 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 7.4 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 7.23 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Chloroform | 4 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 3.9 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Chromium | 3 µg/L 3% of the EPA limit 100 µg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 2.8757 µg/L 9.6% of the EPA limit 30 µg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2017 | 1/1 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Lead | 1.2 µg/L 8% of the EPA limit 15 µg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Cadmium | 1 µg/L 20% of the EPA limit 5 µg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2019 | 1/1 | SYR4 |
| PFHXS | 0.0340 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2023 | 1/1 | UCMR-5 |
| PFOS | 0.0330 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2023 | 1/1 | UCMR-5 |
| Pfpes | 0.0061 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2023 | 1/1 | UCMR-5 |
| PFBS | 0.0055 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2023 | 1/1 | UCMR-5 |
| Pfhxa | 0.0036 µg/L No EPA limit set Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2023 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: ATASCADERO STATE HOSPITAL · 4,100 people · 2026 | 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 93423
| Supplier | State | Population served |
|---|---|---|
| ATASCADERO STATE HOSPITAL | CA | 4,100 |
Frequently asked questions about ZIP 93423 tap water
Is the tap water in ZIP 93423 safe to drink?
EPA testing detected 26 contaminants across the water suppliers serving ZIP 93423. 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 93423?
1 public water supplier report EPA drinking-water monitoring for ZIP 93423. Each is listed above with its population served.
What contaminants are in ZIP 93423'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.