What was found in ZIP 93446
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 | 910000 µg/L 9100% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 2/2 | SYR4 |
| Nitrate | 3845 µg/L 38% of the EPA limit 10000 µg/L Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 2/2 | SYR4 |
| Fluoride | 494 µg/L 12% of the EPA limit 4000 µg/L Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 2/2 | SYR4 |
| Barium | 246 µg/L 12% of the EPA limit 2000 µg/L Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 2/2 | SYR4 |
| TTHM | 60.52 µg/L 76% of the EPA limit 80 µg/L Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019
Highest in the ZIP: 73.3 µg/L — HERITAGE RANCH CSD · 2,956 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 18.85 µg/L 31% of the EPA limit 60 µg/L Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019
Highest in the ZIP: 72.6 µg/L — HERITAGE RANCH CSD · 2,956 people · 2019 | 2/2 | SYR4 |
| Chloroform | 19.51 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019
Highest in the ZIP: 56.9 µg/L — HERITAGE RANCH CSD · 2,956 people · 2019 | 2/2 | SYR4 |
| Lithium | 46.2 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2025 | 1/2 | UCMR-5 |
| Trichloroacetic Acid | 9.55 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019
Highest in the ZIP: 41.4 µg/L — HERITAGE RANCH CSD · 2,956 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 8.67 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019
Highest in the ZIP: 35 µg/L — HERITAGE RANCH CSD · 2,956 people · 2019 | 2/2 | SYR4 |
| Selenium | 28.1 µg/L 56% of the EPA limit 50 µg/L Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 2/2 | SYR4 |
| Copper | 28 µg/L 2.2% of the EPA limit 1300 µg/L Highest in the ZIP: HERITAGE RANCH CSD · 2,956 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 24.97 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 2/2 | SYR4 |
| Bromoform | 24.44 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 2/2 | SYR4 |
| Arsenic | 21 µg/L 210% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 13.725 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019
Highest in the ZIP: 14.29 µg/L — HERITAGE RANCH CSD · 2,956 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 10.72 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 8.5526 µg/L 29% of the EPA limit 30 µg/L Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 1/2 | SYR4 |
| Lead | 7.1 µg/L 47% of the EPA limit 15 µg/L Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 3.38 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 2.05 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2019 | 2/2 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Highest in the ZIP: HERITAGE RANCH CSD · 2,956 people · 2019 | 1/2 | SYR4 |
| Thallium, Total | 0.2000 µg/L 10% of the EPA limit 2 µg/L Highest in the ZIP: HERITAGE RANCH CSD · 2,956 people · 2019 | 1/2 | SYR4 |
| Pfpea | 0.0220 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2025 | 1/2 | UCMR-5 |
| Pfhxa | 0.0200 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2025 | 1/2 | UCMR-5 |
| PFBS | 0.0081 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2025 | 1/2 | UCMR-5 |
| Pfhpa | 0.0063 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2025 | 1/2 | UCMR-5 |
| PFOA | 0.0063 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2025 | 1/2 | UCMR-5 |
| Pfba | 0.0061 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2025 | 1/2 | UCMR-5 |
| PFHXS | 0.0052 µg/L No EPA limit set Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CITY OF PASO ROBLES WATER DIVISION · 31,176 people · 2025 | 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 93446
| Supplier | State | Population served |
|---|---|---|
| CITY OF PASO ROBLES WATER DIVISION | CA | 31,176 |
| HERITAGE RANCH CSD | CA | 2,956 |
Frequently asked questions about ZIP 93446 tap water
Is the tap water in ZIP 93446 safe to drink?
EPA testing detected 31 contaminants across the water suppliers serving ZIP 93446. 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 93446?
2 public water suppliers report EPA drinking-water monitoring for ZIP 93446. Each is listed above with its population served.
What contaminants are in ZIP 93446'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.