What was found in ZIP 93420
The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 630000 µg/L 6300% of the EPA limit, in the worst sample — 10000 µg/L | 3/3 | SYR4 |
| Nitrate | 13000 µg/L 130% of the EPA limit, in the worst sample — 10000 µg/L | 3/3 | SYR4 |
| Fluoride | 390 µg/L 9.8% of the EPA limit 4000 µg/L | 3/3 | SYR4 |
| TTHM | 171.6 µg/L 215% of the EPA limit, in the worst sample — 80 µg/L | 3/3 | SYR4 |
| Selenium | 150 µg/L 300% of the EPA limit, in the worst sample — 50 µg/L | 2/3 | SYR4 |
| Chloroform | 124.6 µg/L No EPA limit set | 2/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 97.1 µg/L 162% of the EPA limit, in the worst sample — 60 µg/L | 3/3 | SYR4 |
| Copper | 89 µg/L 6.8% of the EPA limit 1300 µg/L | 1/3 | SYR4 |
| Lithium | 60 µg/L No EPA limit set | 2/3 | UCMR-5 |
| Dichloroacetic Acid | 51.1 µg/L No EPA limit set | 2/3 | SYR4 |
| Bromodichloromethane | 50.3 µg/L No EPA limit set | 3/3 | SYR4 |
| Dibromochloromethane | 38.7 µg/L No EPA limit set | 3/3 | SYR4 |
| Trichloroacetic Acid | 37.7 µg/L No EPA limit set | 2/3 | SYR4 |
| Arsenic | 24 µg/L 240% of the EPA limit, in the worst sample — 10 µg/L | 2/3 | SYR4 |
| Dibromoacetic Acid | 13.2 µg/L No EPA limit set | 3/3 | SYR4 |
| Bromoform | 12.9 µg/L No EPA limit set | 3/3 | SYR4 |
| Combined Uranium | 12.367 µg/L 41% of the EPA limit 30 µg/L | 2/3 | SYR4 |
| Lead | 6.9 µg/L 46% of the EPA limit 15 µg/L | 1/3 | SYR4 |
| Monochloroacetic Acid | 5.6 µg/L No EPA limit set | 3/3 | SYR4 |
| Cadmium | 2 µg/L 40% of the EPA limit 5 µg/L | 2/3 | SYR4 |
| Monobromoacetic Acid | 1.6 µg/L No EPA limit set | 1/3 | SYR4 |
| PFBS | 0.0110 µg/L No EPA limit set | 1/3 | UCMR-5 |
| PFOS | 0.0068 µg/L No EPA limit set | 1/3 | UCMR-5 |
| PFOA | 0.0058 µg/L No EPA limit set | 1/3 | UCMR-5 |
| PFHXS | 0.0055 µg/L No EPA limit set | 1/3 | UCMR-5 |
| Lead | 0.0052 mg/L 35% of the EPA limit 0.0150 mg/L | 3/3 | LCR |
| Pfpea | 0.0045 µg/L No EPA limit set | 2/3 | UCMR-5 |
| Pfhxa | 0.0035 µg/L No EPA limit set | 1/3 | UCMR-5 |
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 single worst sample on
record — over 100% is worth reading, but is not by itself a violation.
Formal violations are listed separately.
Water suppliers serving ZIP 93420
| Supplier | State | Population served |
|---|---|---|
| CITY OF ARROYO GRANDE UTILITIES DIVISION | CA | 17,963 |
| OCEANO COMM SERVICES DIST. | CA | 7,601 |
| GOLDEN STATE WATER COMPANY - NIPOMO | CA | 4,506 |
Frequently asked questions about ZIP 93420 tap water
Is the tap water in ZIP 93420 safe to drink?
EPA testing detected 28 contaminants across the water suppliers serving ZIP 93420. 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 93420?
3 public water suppliers report EPA drinking-water monitoring for ZIP 93420. Each is listed above with its population served.
What contaminants are in ZIP 93420's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, TTHM, Selenium, and others across this ZIP's suppliers. The full list with levels and sources is above.