What was found in ZIP 94070
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 |
|---|---|---|---|
| TTHM | 61.946 µg/L 77% of the EPA limit 80 µg/L Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019 | 2/2 | SYR4 |
| Chloroform | 61.30849999999998 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 53.42999999999999 µg/L 89% of the EPA limit 60 µg/L Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019
Highest in the ZIP: 54.29999999999998 µg/L — CALIFORNIA WATER SERVICE - SAN CARLOS · 35,344 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 30.165 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 24.175 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 3.6699999999999995 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019
Highest in the ZIP: 9.259999999999964 µg/L — CALIFORNIA WATER SERVICE - SAN CARLOS · 35,344 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 3.9660000000000006 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019
Highest in the ZIP: 7.522999999999997 µg/L — CALIFORNIA WATER SERVICE - SAN CARLOS · 35,344 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 1.7 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 1.25 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019
Highest in the ZIP: 1.5104999999999997 µg/L — CALIFORNIA WATER SERVICE - SAN CARLOS · 35,344 people · 2019 | 2/2 | SYR4 |
| Bromoform | 1.4 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 1.1 µg/L No EPA limit set Highest in the ZIP: CALIFORNIA WATER SERVICE - SAN CARLOS · 35,344 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2024
Highest in the ZIP: 0.0058 mg/L — CALIFORNIA WATER SERVICE - SAN CARLOS · 35,344 people · 2024 | 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 94070
| Supplier | State | Population served |
|---|---|---|
| CITY OF REDWOOD CITY | CA | 92,819 |
| CALIFORNIA WATER SERVICE - SAN CARLOS | CA | 35,344 |
Frequently asked questions about ZIP 94070 tap water
Is the tap water in ZIP 94070 safe to drink?
EPA testing detected 12 contaminants across the water suppliers serving ZIP 94070. 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 94070?
2 public water suppliers report EPA drinking-water monitoring for ZIP 94070. Each is listed above with its population served.
What contaminants are in ZIP 94070's water?
EPA monitoring detected TTHM, Chloroform, Total Haloacetic Acids (HAA5), Dichloroacetic Acid, Trichloroacetic Acid, and others across this ZIP's suppliers. The full list with levels and sources is above.