What was found in ZIP 91107
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-Nitrite | 1600 µg/L 16% of the EPA limit 10000 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2016
Highest in the ZIP: 15000 µg/L — CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/3 | SYR4 |
| Nitrate | 10100 µg/L 101% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019
Highest in the ZIP: 10353.1 µg/L — CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 3/3 | SYR4 |
| Fluoride | 1376 µg/L 34% of the EPA limit 4000 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 3/3 | SYR4 |
| Barium | 163.5 µg/L 8.2% of the EPA limit 2000 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 1/3 | SYR4 |
| Copper | 153.3 µg/L 12% of the EPA limit 1300 µg/L Highest in the ZIP: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 1/3 | SYR4 |
| Lithium | 64.2 µg/L No EPA limit set Main supplier: PASADENA WATER AND POWER · 164,344 people · 2024
Highest in the ZIP: 91.9 µg/L — CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2025 | 2/3 | UCMR-5 |
| TTHM | 51.64 µg/L 65% of the EPA limit 80 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 3/3 | SYR4 |
| Combined Uranium | 21.9775 µg/L 73% of the EPA limit 30 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2018
Highest in the ZIP: 25.926 µg/L — SUNNY SLOPE WATER CO. · 25,252 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 22 µg/L 37% of the EPA limit 60 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 3/3 | SYR4 |
| Chromium | 18.4 µg/L 18% of the EPA limit 100 µg/L Highest in the ZIP: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/3 | SYR4 |
| Dibromochloromethane | 18.1 µg/L No EPA limit set Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 3/3 | SYR4 |
| Chloroform | 17.765 µg/L No EPA limit set Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 16.1 µg/L No EPA limit set Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 12 µg/L No EPA limit set Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 3/3 | SYR4 |
| cis-1,2-Dichloroethylene | 10.65 µg/L 15% of the EPA limit 70 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 2/3 | SYR4 |
| Trichloroacetic Acid | 7.4 µg/L No EPA limit set Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019
Highest in the ZIP: 9.855 µg/L — CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 3/3 | SYR4 |
| Bromoform | 7.182 µg/L No EPA limit set Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 3/3 | SYR4 |
| Tetrachloroethylene | 3.9955 µg/L 80% of the EPA limit 5 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019
Highest in the ZIP: 6.5 µg/L — CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 5.83 µg/L No EPA limit set Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 3/3 | SYR4 |
| Trichloroethylene | 4.6005 µg/L 92% of the EPA limit 5 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 3/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 3.7 µg/L 62% of the EPA limit 6 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2018 | 1/3 | SYR4 |
| trans-1,2-Dichloroethylene | 3.648 µg/L 3.6% of the EPA limit 100 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 1/3 | SYR4 |
| Arsenic | 2.88 µg/L 29% of the EPA limit 10 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019
Highest in the ZIP: 3.2 µg/L — SUNNY SLOPE WATER CO. · 25,252 people · 2018 | 3/3 | SYR4 |
| Monochloroacetic Acid | 3.13 µg/L No EPA limit set Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 2/3 | SYR4 |
| Carbon Tetrachloride | 2.7985 µg/L 56% of the EPA limit 5 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 3/3 | SYR4 |
| 1,2-Dichloropropane | 2.77 µg/L 55% of the EPA limit 5 µg/L Highest in the ZIP: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 1/3 | SYR4 |
| Mercury | 2.01 µg/L 100% of the EPA limit, at the 95th percentile of samples — 2 µg/L Highest in the ZIP: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 1/3 | SYR4 |
| Monobromoacetic Acid | 1.265 µg/L No EPA limit set Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 1/3 | SYR4 |
| Lead | 1 µg/L 6.7% of the EPA limit 15 µg/L Highest in the ZIP: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 1/3 | SYR4 |
| 1,1-Dichloroethylene | 0.9020 µg/L 13% of the EPA limit 7 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 1/3 | SYR4 |
| Toluene | 0.6000 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 1/3 | SYR4 |
| Dichloromethane | 0.5400 µg/L 11% of the EPA limit 5 µg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2019 | 1/3 | SYR4 |
| Pfba | 0.0053 µg/L No EPA limit set Highest in the ZIP: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2025 | 1/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: PASADENA WATER AND POWER · 164,344 people · 2023 | 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 91107
| Supplier | State | Population served |
|---|---|---|
| PASADENA WATER AND POWER | CA | 164,344 |
| CAL/AM WATER COMPANY - SAN MARINO | CA | 47,995 |
| SUNNY SLOPE WATER CO. | CA | 25,252 |
Frequently asked questions about ZIP 91107 tap water
Is the tap water in ZIP 91107 safe to drink?
EPA testing detected 34 contaminants across the water suppliers serving ZIP 91107. 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 91107?
3 public water suppliers report EPA drinking-water monitoring for ZIP 91107. Each is listed above with its population served.
What contaminants are in ZIP 91107's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Barium, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.