What was found in ZIP 94066
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 | 400000 µg/L 4000% of the EPA limit, in the worst sample — 10000 µg/L | 3/3 | SYR4 |
| Nitrate | 21400 µg/L 214% of the EPA limit, in the worst sample — 10000 µg/L | 3/3 | SYR4 |
| Fluoride | 900 µg/L 23% of the EPA limit 4000 µg/L | 3/3 | SYR4 |
| Nitrite | 400 µg/L 40% of the EPA limit 1000 µg/L | 1/3 | SYR4 |
| Barium | 190 µg/L 9.5% of the EPA limit 2000 µg/L | 2/3 | SYR4 |
| TTHM | 100 µg/L 125% of the EPA limit, in the worst sample — 80 µg/L | 3/3 | SYR4 |
| Chloroform | 77 µg/L No EPA limit set | 3/3 | SYR4 |
| Copper | 73.33 µg/L 5.6% of the EPA limit 1300 µg/L | 1/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 56 µg/L 93% of the EPA limit 60 µg/L | 2/3 | SYR4 |
| Lithium | 40 µg/L No EPA limit set | 2/3 | UCMR-5 |
| Dichloroacetic Acid | 34 µg/L No EPA limit set | 2/3 | SYR4 |
| Chromium | 26.2 µg/L 26% of the EPA limit 100 µg/L | 3/3 | SYR4 |
| Trichloroacetic Acid | 24.9 µg/L No EPA limit set | 2/3 | SYR4 |
| Bromodichloromethane | 18 µg/L No EPA limit set | 3/3 | SYR4 |
| Arsenic | 16.211 µg/L 162% of the EPA limit, in the worst sample — 10 µg/L | 2/3 | SYR4 |
| Bromoform | 5.67 µg/L No EPA limit set | 2/3 | SYR4 |
| Lead | 5.359 µg/L 36% of the EPA limit 15 µg/L | 1/3 | SYR4 |
| Dibromochloromethane | 5.3 µg/L No EPA limit set | 2/3 | SYR4 |
| Monochloroacetic Acid | 4 µg/L No EPA limit set | 2/3 | SYR4 |
| Combined Radium (-226 And -228) | 3.8 pCi/L 76% of the EPA limit 5 pCi/L | 1/3 | SYR4 |
| Dibromoacetic Acid | 3.4 µg/L No EPA limit set | 2/3 | SYR4 |
| Combined Uranium | 2.57472 µg/L 8.6% of the EPA limit 30 µg/L | 1/3 | SYR4 |
| Selenium | 2.23 µg/L 4.5% of the EPA limit 50 µg/L | 1/3 | SYR4 |
| Monobromoacetic Acid | 1.2 µg/L No EPA limit set | 1/3 | SYR4 |
| 1,2-Dichloropropane | 1.04 µg/L 21% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Toluene | 0.7800 µg/L 0.1% of the EPA limit 1000 µg/L | 1/3 | SYR4 |
| Trichloroethylene | 0.7500 µg/L 15% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Antimony, Total | 0.1320 µg/L 2.2% of the EPA limit 6 µg/L | 1/3 | SYR4 |
| Cadmium | 0.0270 µg/L 0.5% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Thallium, Total | 0.0230 µg/L 1.2% of the EPA limit 2 µg/L | 1/3 | SYR4 |
| Mercury | 0.0130 µg/L 0.7% of the EPA limit 2 µg/L | 1/3 | SYR4 |
| Beryllium, Total | 0.0100 µg/L 0.3% of the EPA limit 4 µg/L | 1/3 | SYR4 |
| Lead | 0.0041 mg/L 27% of the EPA limit 0.0150 mg/L | 3/3 | 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 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 94066
| Supplier | State | Population served |
|---|---|---|
| CALIFORNIA WATER SERVICE-S SAN FRANCISCO | CA | 64,146 |
| CITY OF SAN BRUNO | CA | 42,631 |
| SAN FRANCISCO REGIONAL WATER SYSTEM | CA | 600 |
Frequently asked questions about ZIP 94066 tap water
Is the tap water in ZIP 94066 safe to drink?
EPA testing detected 33 contaminants across the water suppliers serving ZIP 94066. 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 94066?
3 public water suppliers report EPA drinking-water monitoring for ZIP 94066. Each is listed above with its population served.
What contaminants are in ZIP 94066's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Nitrite, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.