What was found in ZIP 94303
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 | 1/2 | 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 | 2/2 | SYR4 |
| Cyanide | 220 µg/L 110% of the EPA limit, at the 95th percentile of samples — 200 µg/L Highest in the ZIP: CITY OF EAST PALO ALTO · 29,519 people · 2019 | 1/2 | 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: 63.01 µg/L — CITY OF EAST PALO ALTO · 29,519 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: 62.25 µg/L — CITY OF EAST PALO ALTO · 29,519 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: 51.69999999999999 µg/L — CITY OF EAST PALO ALTO · 29,519 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 29 µg/L No EPA limit set Main supplier: CITY OF PALO ALTO · 67,231 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 23 µg/L No EPA limit set Main supplier: CITY OF PALO ALTO · 67,231 people · 2019
Highest in the ZIP: 26.959999999999994 µg/L — CITY OF EAST PALO ALTO · 29,519 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: 6.1 µg/L — CITY OF EAST PALO ALTO · 29,519 people · 2019 | 2/2 | 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 | 1/2 | SYR4 |
| Monochloroacetic Acid | 5.3500000000000005 µg/L No EPA limit set Main supplier: CITY OF PALO ALTO · 67,231 people · 2019 | 2/2 | SYR4 |
| Selenium | 5.3 µg/L 11% of the EPA limit 50 µg/L Highest in the ZIP: CITY OF EAST PALO ALTO · 29,519 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 4.059999999999999 µg/L No EPA limit set Main supplier: CITY OF PALO ALTO · 67,231 people · 2019 | 2/2 | SYR4 |
| Arsenic | 2.1 µg/L 21% of the EPA limit 10 µg/L Main supplier: CITY OF PALO ALTO · 67,231 people · 2018
Highest in the ZIP: 3.3 µg/L — CITY OF EAST PALO ALTO · 29,519 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 1.7 µg/L No EPA limit set Main supplier: CITY OF PALO ALTO · 67,231 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 1 µg/L No EPA limit set Highest in the ZIP: CITY OF EAST PALO ALTO · 29,519 people · 2019 | 1/2 | SYR4 |
| Bromoform | 0.5000 µg/L No EPA limit set Highest in the ZIP: CITY OF EAST PALO ALTO · 29,519 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 | 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 94303
| Supplier | State | Population served |
|---|---|---|
| CITY OF PALO ALTO | CA | 67,231 |
| CITY OF EAST PALO ALTO | CA | 29,519 |
Frequently asked questions about ZIP 94303 tap water
Is the tap water in ZIP 94303 safe to drink?
EPA testing detected 20 contaminants across the water suppliers serving ZIP 94303. 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 94303?
2 public water suppliers report EPA drinking-water monitoring for ZIP 94303. Each is listed above with its population served.
What contaminants are in ZIP 94303's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Barium, Fluoride, Cyanide, and others across this ZIP's suppliers. The full list with levels and sources is above.