What was found in ZIP 94553
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 | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L | 3/3 | SYR4 |
| Nitrate | 4859 µg/L 49% of the EPA limit 10000 µg/L | 3/3 | SYR4 |
| Fluoride | 1000 µg/L 25% of the EPA limit 4000 µg/L | 3/3 | SYR4 |
| Nitrite | 520 µg/L 52% of the EPA limit 1000 µg/L | 1/3 | SYR4 |
| Copper | 320 µg/L 25% of the EPA limit 1300 µg/L | 2/3 | SYR4 |
| Barium | 160 µg/L 8% of the EPA limit 2000 µg/L | 2/3 | SYR4 |
| Gross Beta Particle Activity | 65 pCi/L No EPA limit set | 3/3 | SYR4 |
| TTHM | 44 µg/L 55% of the EPA limit 80 µg/L | 2/3 | SYR4 |
| Selenium | 38 µg/L 76% of the EPA limit 50 µg/L | 2/3 | SYR4 |
| Chromium | 30 µg/L 30% of the EPA limit 100 µg/L | 3/3 | SYR4 |
| Bromate | 18 µg/L 180% of the EPA limit, in the worst sample — 10 µg/L | 2/3 | SYR4 |
| Dibromochloromethane | 18 µg/L No EPA limit set | 2/3 | SYR4 |
| Arsenic | 17 µg/L 170% of the EPA limit, in the worst sample — 10 µg/L | 3/3 | SYR4 |
| Bromoform | 16 µg/L No EPA limit set | 2/3 | SYR4 |
| Bromodichloromethane | 14 µg/L No EPA limit set | 1/3 | SYR4 |
| Chloroform | 13 µg/L No EPA limit set | 1/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 12 µg/L 20% of the EPA limit 60 µg/L | 1/3 | SYR4 |
| Dichloroacetic Acid | 7.9 µg/L No EPA limit set | 1/3 | SYR4 |
| Lead | 6.6 µg/L 44% of the EPA limit 15 µg/L | 3/3 | SYR4 |
| Dibromoacetic Acid | 5 µg/L No EPA limit set | 1/3 | SYR4 |
| Trichloroacetic Acid | 4.2 µg/L No EPA limit set | 1/3 | SYR4 |
| Dichloromethane | 3.4 µg/L 68% of the EPA limit 5 µg/L | 2/3 | SYR4 |
| Monobromoacetic Acid | 2.6 µg/L No EPA limit set | 1/3 | SYR4 |
| Cyanide | 1.6 µg/L 0.8% of the EPA limit 200 µg/L | 2/3 | SYR4 |
| Cadmium | 1.6 µg/L 32% of the EPA limit 5 µg/L | 2/3 | SYR4 |
| Combined Uranium | 1.49 µg/L 5% of the EPA limit 30 µg/L | 2/3 | SYR4 |
| Asbestos | 1.2 MFL 17% of the EPA limit 7 MFL | 3/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.3900 µg/L 6.5% of the EPA limit 6 µg/L | 2/3 | SYR4 |
| Di(2-ethylhexyl) Adipate | 0.2100 µg/L 0.1% of the EPA limit 400 µg/L | 2/3 | SYR4 |
| Combined Radium (-226 And -228) | 0.1600 pCi/L 3.2% of the EPA limit 5 pCi/L | 1/3 | SYR4 |
| Pfba | 0.0052 µg/L No EPA limit set | 1/3 | UCMR-5 |
| Lead | 0.0031 mg/L 21% 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 94553
| Supplier | State | Population served |
|---|---|---|
| EAST BAY MUD | CA | 1,442,800 |
| CONTRA COSTA WATER DISTRICT | CA | 198,000 |
| CITY OF MARTINEZ | CA | 30,997 |
Frequently asked questions about ZIP 94553 tap water
Is the tap water in ZIP 94553 safe to drink?
EPA testing detected 32 contaminants across the water suppliers serving ZIP 94553. 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 94553?
3 public water suppliers report EPA drinking-water monitoring for ZIP 94553. Each is listed above with its population served.
What contaminants are in ZIP 94553'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.