What was found in ZIP 91108
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 | 15000 µg/L 150% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 1/2 | SYR4 |
| Nitrate | 10353.1 µg/L 104% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Fluoride | 990 µg/L 25% of the EPA limit 4000 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Copper | 153.3 µg/L 12% of the EPA limit 1300 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 1/2 | SYR4 |
| Lithium | 91.9 µg/L No EPA limit set Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2025 | 1/2 | UCMR-5 |
| Combined Uranium | 14.2444 µg/L 47% of the EPA limit 30 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019
Highest in the ZIP: 25.926 µg/L — SUNNY SLOPE WATER CO. · 25,252 people · 2019 | 2/2 | SYR4 |
| TTHM | 24.6 µg/L 31% of the EPA limit 80 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 20 µg/L 33% of the EPA limit 60 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Chromium | 18.4 µg/L 18% of the EPA limit 100 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Chloroform | 12.88 µg/L No EPA limit set Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 12.645 µg/L No EPA limit set Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 11.46 µg/L No EPA limit set Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 9.95 µg/L No EPA limit set Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 9.855 µg/L No EPA limit set Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Tetrachloroethylene | 6.5 µg/L 130% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Bromoform | 4.89 µg/L No EPA limit set Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 4.41 µg/L No EPA limit set Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| Arsenic | 2.9 µg/L 29% of the EPA limit 10 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019
Highest in the ZIP: 3.2 µg/L — SUNNY SLOPE WATER CO. · 25,252 people · 2018 | 2/2 | SYR4 |
| Monochloroacetic Acid | 3 µg/L No EPA limit set Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 1/2 | SYR4 |
| Trichloroethylene | 2.8 µg/L 56% of the EPA limit 5 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 2/2 | SYR4 |
| 1,2-Dichloropropane | 2.77 µg/L 55% of the EPA limit 5 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 1/2 | SYR4 |
| Mercury | 2.01 µg/L 100% of the EPA limit, at the 95th percentile of samples — 2 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 1/2 | SYR4 |
| Carbon Tetrachloride | 0.8000 µg/L 16% of the EPA limit 5 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019
Highest in the ZIP: 1.8 µg/L — SUNNY SLOPE WATER CO. · 25,252 people · 2019 | 2/2 | SYR4 |
| cis-1,2-Dichloroethylene | 1.04 µg/L 1.5% of the EPA limit 70 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 1/2 | SYR4 |
| Lead | 1 µg/L 6.7% of the EPA limit 15 µg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0053 µg/L No EPA limit set Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CAL/AM WATER COMPANY - SAN MARINO · 47,995 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 91108
| Supplier | State | Population served |
|---|---|---|
| CAL/AM WATER COMPANY - SAN MARINO | CA | 47,995 |
| SUNNY SLOPE WATER CO. | CA | 25,252 |
Frequently asked questions about ZIP 91108 tap water
Is the tap water in ZIP 91108 safe to drink?
EPA testing detected 27 contaminants across the water suppliers serving ZIP 91108. 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 91108?
2 public water suppliers report EPA drinking-water monitoring for ZIP 91108. Each is listed above with its population served.
What contaminants are in ZIP 91108's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Copper, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.