What was found in ZIP 94301
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 | 3300 µg/L 33% of the EPA limit 10000 µg/L Main supplier: CITY OF PALO ALTO · 67,231 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 3000 µg/L 30% of the EPA limit 10000 µg/L Main supplier: CITY OF PALO ALTO · 67,231 people · 2018 | 1/2 | SYR4 |
| Barium | 614 µg/L 31% of the EPA limit 2000 µg/L Main supplier: CITY OF PALO ALTO · 67,231 people · 2018 | 2/2 | SYR4 |
| Fluoride | 232.5 µg/L 5.8% of the EPA limit 4000 µg/L Main supplier: CITY OF PALO ALTO · 67,231 people · 2018
Highest in the ZIP: 377.5 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 2/2 | SYR4 |
| TTHM | 52.04999999999998 µg/L 65% of the EPA limit 80 µg/L Main supplier: CITY OF PALO ALTO · 67,231 people · 2019
Highest in the ZIP: 71.02 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 2/2 | SYR4 |
| Chloroform | 50 µg/L No EPA limit set Main supplier: CITY OF PALO ALTO · 67,231 people · 2019
Highest in the ZIP: 58.279999999999994 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 51.64999999999998 µg/L 86% of the EPA limit 60 µg/L Main supplier: CITY OF PALO ALTO · 67,231 people · 2019
Highest in the ZIP: 54 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 2/2 | SYR4 |
| Bromoform | 33.73199999999997 µg/L No EPA limit set Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 29 µg/L No EPA limit set Main supplier: CITY OF PALO ALTO · 67,231 people · 2019
Highest in the ZIP: 32 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 2/2 | 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 | 1/2 | SYR4 |
| Trichloroacetic Acid | 23 µg/L No EPA limit set Main supplier: CITY OF PALO ALTO · 67,231 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 4.354999999999999 µg/L No EPA limit set Main supplier: CITY OF PALO ALTO · 67,231 people · 2019
Highest in the ZIP: 15.930999999999989 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 2/2 | 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 | 1/2 | SYR4 |
| Dibromoacetic Acid | 6.2 µg/L No EPA limit set Highest in the ZIP: CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 5.4235999999999995 µg/L 18% of the EPA limit 30 µg/L Main supplier: CITY OF PALO ALTO · 67,231 people · 2016 | 2/2 | SYR4 |
| Monochloroacetic Acid | 5.3500000000000005 µg/L No EPA limit set Main supplier: CITY OF PALO ALTO · 67,231 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 1.7 µg/L No EPA limit set Main supplier: CITY OF PALO ALTO · 67,231 people · 2019
Highest in the ZIP: 4.609999999999999 µg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 4.059999999999999 µg/L No EPA limit set Main supplier: CITY OF PALO ALTO · 67,231 people · 2019 | 2/2 | 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 | 1/2 | SYR4 |
| Arsenic | 2.1 µg/L 21% of the EPA limit 10 µg/L Main supplier: CITY OF PALO ALTO · 67,231 people · 2018 | 2/2 | 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 | 1/2 | 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 | 1/2 | 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 | 1/2 | 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 | 1/2 | 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 | 1/2 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CITY OF PALO ALTO · 67,231 people · 2023
Highest in the ZIP: 0.0040 mg/L — CALIFORNIA WATER SERVICE - BEAR GULCH · 61,431 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 94301
| Supplier | State | Population served |
|---|---|---|
| CITY OF PALO ALTO | CA | 67,231 |
| CALIFORNIA WATER SERVICE - BEAR GULCH | CA | 61,431 |
Frequently asked questions about ZIP 94301 tap water
Is the tap water in ZIP 94301 safe to drink?
EPA testing detected 26 contaminants across the water suppliers serving ZIP 94301. 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 94301?
2 public water suppliers report EPA drinking-water monitoring for ZIP 94301. Each is listed above with its population served.
What contaminants are in ZIP 94301's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Barium, Fluoride, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.