What was found in ZIP 94539
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 | 781580 µg/L 7816% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019 | 3/3 | SYR4 |
| Nitrate | 2534 µg/L 25% of the EPA limit 10000 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019
Highest in the ZIP: 21400 µg/L — SAN FRANCISCO REGIONAL WATER SYSTEM · 600 people · 2019 | 2/3 | SYR4 |
| Fluoride | 977 µg/L 24% of the EPA limit 4000 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019 | 2/3 | SYR4 |
| Nitrite | 400 µg/L 40% of the EPA limit 1000 µg/L Highest in the ZIP: SAN FRANCISCO REGIONAL WATER SYSTEM · 600 people · 2019 | 1/3 | SYR4 |
| Copper | 59.3 µg/L 4.6% of the EPA limit 1300 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019
Highest in the ZIP: 288.5 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2018 | 2/3 | SYR4 |
| Barium | 172.273 µg/L 8.6% of the EPA limit 2000 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019 | 3/3 | SYR4 |
| TTHM | 46.6 µg/L 58% of the EPA limit 80 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019
Highest in the ZIP: 122.275 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 3/3 | SYR4 |
| Chloroform | 39.314 µg/L No EPA limit set Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019
Highest in the ZIP: 94.645 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 28 µg/L 47% of the EPA limit 60 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019
Highest in the ZIP: 62.71 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 2/3 | SYR4 |
| Trichloroacetic Acid | 13.1 µg/L No EPA limit set Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019
Highest in the ZIP: 36.03 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 2/3 | SYR4 |
| Dichloroacetic Acid | 16.85 µg/L No EPA limit set Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019
Highest in the ZIP: 30.355 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 2/3 | SYR4 |
| Chromium | 10 µg/L 10% of the EPA limit 100 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019
Highest in the ZIP: 25.78 µg/L — SAN FRANCISCO REGIONAL WATER SYSTEM · 600 people · 2019 | 2/3 | SYR4 |
| Bromoform | 24.3955 µg/L No EPA limit set Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019 | 2/3 | SYR4 |
| Bromodichloromethane | 16.345 µg/L No EPA limit set Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019
Highest in the ZIP: 24.055 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 3/3 | SYR4 |
| Lead | 18.392 µg/L 123% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the ZIP: BRYAN CO. RWS & SWMD #2 · 6,270 people · 2018 | 1/3 | SYR4 |
| Dibromochloromethane | 13.1 µg/L No EPA limit set Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019 | 2/3 | SYR4 |
| Selenium | 11.2 µg/L 22% of the EPA limit 50 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019 | 1/3 | SYR4 |
| Monochloroacetic Acid | 2 µg/L No EPA limit set Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019
Highest in the ZIP: 8.368 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 2/3 | SYR4 |
| Dibromoacetic Acid | 7.25 µg/L No EPA limit set Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019 | 2/3 | SYR4 |
| Arsenic | 4.6 µg/L 46% of the EPA limit 10 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019 | 2/3 | SYR4 |
| Combined Radium (-226 And -228) | 3.8 pCi/L 76% of the EPA limit 5 pCi/L Highest in the ZIP: SAN FRANCISCO REGIONAL WATER SYSTEM · 600 people · 2019 | 2/3 | SYR4 |
| Monobromoacetic Acid | 1.1 µg/L No EPA limit set Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019
Highest in the ZIP: 3.6495 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 2/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 3.3 µg/L 55% of the EPA limit 6 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019 | 1/3 | SYR4 |
| Combined Uranium | 3.2035 µg/L 11% of the EPA limit 30 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019 | 1/3 | SYR4 |
| Gross Beta Particle Activity | 2.054 pCi/L No EPA limit set Highest in the ZIP: BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 1/3 | SYR4 |
| Bromate | 1.1 µg/L 11% of the EPA limit 10 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2014 | 1/3 | SYR4 |
| Asbestos | 0.9600 MFL 14% of the EPA limit 7 MFL Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019 | 1/3 | SYR4 |
| 2,4-D | 0.9000 µg/L 1.3% of the EPA limit 70 µg/L Highest in the ZIP: BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 1/3 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0320 µg/L 16% of the EPA limit 0.2000 µg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2019 | 1/3 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: ALAMEDA COUNTY WATER DISTRICT · 344,000 people · 2024
Highest in the ZIP: 0.00056 mg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2024 | 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 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 94539
| Supplier | State | Population served |
|---|---|---|
| ALAMEDA COUNTY WATER DISTRICT | CA | 344,000 |
| BRYAN CO. RWS & SWMD #2 | OK | 6,270 |
| SAN FRANCISCO REGIONAL WATER SYSTEM | CA | 600 |
Frequently asked questions about ZIP 94539 tap water
Is the tap water in ZIP 94539 safe to drink?
EPA testing detected 30 contaminants across the water suppliers serving ZIP 94539. 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 94539?
3 public water suppliers report EPA drinking-water monitoring for ZIP 94539. Each is listed above with its population served.
What contaminants are in ZIP 94539's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Nitrite, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.