What was found in ZIP 94063
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 |
|---|---|---|---|
| Fluoride | 377.5 µg/L 9.4% of the EPA limit 4000 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | SYR4 |
| Barium | 107 µg/L 5.4% of the EPA limit 2000 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | SYR4 |
| Nitrate | 91.756 µg/L 0.9% of the EPA limit 10000 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | SYR4 |
| TTHM | 61.946 µg/L 77% of the EPA limit 80 µg/L Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019
Highest in the ZIP: 71.02 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 3/3 | SYR4 |
| Chloroform | 61.30849999999998 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019 | 3/3 | 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 | 3/3 | SYR4 |
| Bromoform | 1.4 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019
Highest in the ZIP: 33.73199999999997 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 30.165 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019
Highest in the ZIP: 32 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 3/3 | SYR4 |
| Copper | 27.98395 µg/L 2.2% of the EPA limit 1300 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | SYR4 |
| Trichloroacetic Acid | 24.175 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 3.9660000000000006 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019
Highest in the ZIP: 15.930999999999989 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 3/3 | 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 | 3/3 | SYR4 |
| Chromium | 7.2164999999999955 µg/L 7.2% of the EPA limit 100 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | SYR4 |
| Dibromoacetic Acid | 1.7 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019
Highest in the ZIP: 6.2 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 1.25 µg/L No EPA limit set Main supplier: CITY OF REDWOOD CITY · 92,819 people · 2019
Highest in the ZIP: 4.609999999999999 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 3/3 | SYR4 |
| Selenium | 3.8644 µg/L 7.7% of the EPA limit 50 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | SYR4 |
| Arsenic | 1.7318500000000001 µg/L 17% of the EPA limit 10 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | SYR4 |
| Monobromoacetic Acid | 1.3 µg/L No EPA limit set Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 2/3 | SYR4 |
| Combined Uranium | 1.033315 µg/L 3.4% of the EPA limit 30 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | SYR4 |
| Lead | 0.4694 µg/L 3.1% of the EPA limit 15 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | SYR4 |
| Antimony, Total | 0.2215 µg/L 3.7% of the EPA limit 6 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | SYR4 |
| Cadmium | 0.0280 µg/L 0.6% of the EPA limit 5 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | SYR4 |
| Mercury | 0.0195 µg/L 1% of the EPA limit 2 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | SYR4 |
| Beryllium, Total | 0.0118 µg/L 0.3% of the EPA limit 4 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/3 | 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 | 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 94063
| Supplier | State | Population served |
|---|---|---|
| CITY OF REDWOOD CITY | CA | 92,819 |
| CALIFORNIA WATER SERVICE - BEAR GULCH | CA | 61,431 |
| CALIFORNIA WATER SERVICE - SAN CARLOS | CA | 35,344 |
Frequently asked questions about ZIP 94063 tap water
Is the tap water in ZIP 94063 safe to drink?
EPA testing detected 25 contaminants across the water suppliers serving ZIP 94063. 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 94063?
3 public water suppliers report EPA drinking-water monitoring for ZIP 94063. Each is listed above with its population served.
What contaminants are in ZIP 94063's water?
EPA monitoring detected Fluoride, Barium, Nitrate, TTHM, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.