What was found in ZIP 94109
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 | 11715 µg/L 117% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: SFPUC CITY DISTRIBUTION DIVISION · 848,019 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 10900 µg/L 109% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: SFPUC CITY DISTRIBUTION DIVISION · 848,019 people · 2019 | 2/2 | SYR4 |
| Fluoride | 674.45 µg/L 17% of the EPA limit 4000 µg/L Main supplier: SFPUC CITY DISTRIBUTION DIVISION · 848,019 people · 2019
Highest in the ZIP: 1700 µg/L — MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 2/2 | SYR4 |
| Copper | 269 µg/L 21% of the EPA limit 1300 µg/L Main supplier: SFPUC CITY DISTRIBUTION DIVISION · 848,019 people · 2019 | 1/2 | SYR4 |
| Toluene | 120.035 µg/L 12% of the EPA limit 1000 µg/L Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| TTHM | 51.3 µg/L 64% of the EPA limit 80 µg/L Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Bromoform | 36.9 µg/L No EPA limit set Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Chromium | 20.69 µg/L 21% of the EPA limit 100 µg/L Main supplier: SFPUC CITY DISTRIBUTION DIVISION · 848,019 people · 2019
Highest in the ZIP: 22.95 µg/L — MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 12.9 µg/L No EPA limit set Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Selenium | 8.345 µg/L 17% of the EPA limit 50 µg/L Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 7.88 µg/L 13% of the EPA limit 60 µg/L Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Arsenic | 2.5835 µg/L 26% of the EPA limit 10 µg/L Main supplier: SFPUC CITY DISTRIBUTION DIVISION · 848,019 people · 2019
Highest in the ZIP: 7.7 µg/L — MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 7.49 µg/L No EPA limit set Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Lead | 6.73 µg/L 45% of the EPA limit 15 µg/L Main supplier: SFPUC CITY DISTRIBUTION DIVISION · 848,019 people · 2019 | 1/2 | SYR4 |
| Chloroform | 5.28 µg/L No EPA limit set Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| cis-1,2-Dichloroethylene | 5 µg/L 7.1% of the EPA limit 70 µg/L Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 4.1 µg/L No EPA limit set Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 3.575 µg/L No EPA limit set Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Trichloroethylene | 3.095 µg/L 62% of the EPA limit 5 µg/L Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Tetrachloroethylene | 2.28 µg/L 46% of the EPA limit 5 µg/L Main supplier: SFPUC CITY DISTRIBUTION DIVISION · 848,019 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 1.75 µg/L No EPA limit set Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| trans-1,2-Dichloroethylene | 1.74 µg/L 1.7% of the EPA limit 100 µg/L Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Carbon Tetrachloride | 0.9750 µg/L 20% of the EPA limit 5 µg/L Main supplier: SFPUC CITY DISTRIBUTION DIVISION · 848,019 people · 2019
Highest in the ZIP: 1.1 µg/L — MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 2/2 | SYR4 |
| 1,2-Dichloropropane | 0.5880 µg/L 12% of the EPA limit 5 µg/L Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Xylenes, Total | 0.5200 µg/L 0% of the EPA limit 10000 µg/L Highest in the ZIP: MONTARA WATER AND SANITARY DISTRICT · 6,078 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: SFPUC CITY DISTRIBUTION DIVISION · 848,019 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 94109
| Supplier | State | Population served |
|---|---|---|
| SFPUC CITY DISTRIBUTION DIVISION | CA | 848,019 |
| MONTARA WATER AND SANITARY DISTRICT | CA | 6,078 |
Frequently asked questions about ZIP 94109 tap water
Is the tap water in ZIP 94109 safe to drink?
EPA testing detected 26 contaminants across the water suppliers serving ZIP 94109. 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 94109?
2 public water suppliers report EPA drinking-water monitoring for ZIP 94109. Each is listed above with its population served.
What contaminants are in ZIP 94109's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Copper, Toluene, and others across this ZIP's suppliers. The full list with levels and sources is above.