What was found in ZIP 94928
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 | 700000 µg/L 7000% of the EPA limit, in the worst sample — 10000 µg/L | 2/3 | SYR4 |
| Nitrate | 9944 µg/L 99% of the EPA limit 10000 µg/L | 3/3 | SYR4 |
| Fluoride | 1020 µg/L 26% 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 | 170 µg/L 8.5% of the EPA limit 2000 µg/L | 2/3 | SYR4 |
| Copper | 121 µg/L 9.3% of the EPA limit 1300 µg/L | 2/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 99.2 µg/L 165% of the EPA limit, in the worst sample — 60 µg/L | 3/3 | SYR4 |
| TTHM | 86.2 µg/L 108% of the EPA limit, in the worst sample — 80 µg/L | 3/3 | SYR4 |
| Chloroform | 68.4 µg/L No EPA limit set | 3/3 | SYR4 |
| Dichloroacetic Acid | 57.4 µg/L No EPA limit set | 2/3 | SYR4 |
| Trichloroacetic Acid | 40.6 µg/L No EPA limit set | 2/3 | SYR4 |
| Lithium | 39 µg/L No EPA limit set | 2/3 | UCMR-5 |
| Bromodichloromethane | 16.2 µg/L No EPA limit set | 3/3 | SYR4 |
| Combined Uranium | 12.6948 µg/L 42% of the EPA limit 30 µg/L | 1/3 | SYR4 |
| Dibromochloromethane | 10.8 µg/L No EPA limit set | 3/3 | SYR4 |
| Chromium | 10 µg/L 10% of the EPA limit 100 µg/L | 1/3 | SYR4 |
| Arsenic | 9.9 µg/L 99% of the EPA limit 10 µg/L | 2/3 | SYR4 |
| Lead | 8.6 µg/L 57% of the EPA limit 15 µg/L | 1/3 | SYR4 |
| Dibromoacetic Acid | 6.4 µg/L No EPA limit set | 3/3 | SYR4 |
| Selenium | 5.1 µg/L 10% of the EPA limit 50 µg/L | 1/3 | SYR4 |
| Bromoform | 4.06 µg/L No EPA limit set | 3/3 | SYR4 |
| Monochloroacetic Acid | 3.7 µg/L No EPA limit set | 1/3 | SYR4 |
| Xylenes, Total | 3.3 µg/L 0% of the EPA limit 10000 µg/L | 1/3 | SYR4 |
| Toluene | 1 µg/L 0.1% of the EPA limit 1000 µg/L | 1/3 | SYR4 |
| 6:2 Fts | 0.0071 µg/L No EPA limit set | 1/3 | UCMR-5 |
| PFHXS | 0.0057 µg/L No EPA limit set | 1/3 | UCMR-5 |
| PFOS | 0.0045 µg/L No EPA limit set | 1/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% 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 94928
| Supplier | State | Population served |
|---|---|---|
| MARIN MUNICIPAL WATER DISTRICT | CA | 186,895 |
| ROHNERT PARK, CITY OF | CA | 43,821 |
| SONOMA STATE UNIVERSITY | CA | 10,986 |
Frequently asked questions about ZIP 94928 tap water
Is the tap water in ZIP 94928 safe to drink?
EPA testing detected 28 contaminants across the water suppliers serving ZIP 94928. 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 94928?
3 public water suppliers report EPA drinking-water monitoring for ZIP 94928. Each is listed above with its population served.
What contaminants are in ZIP 94928'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.