What was found in ZIP 91792
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 | 5650 µg/L 56% of the EPA limit 10000 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| Nitrate-Nitrite | 5539.999999999999 µg/L 55% of the EPA limit 10000 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| Fluoride | 470 µg/L 12% of the EPA limit 4000 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| Barium | 150 µg/L 7.5% of the EPA limit 2000 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| TTHM | 50.75 µg/L 63% of the EPA limit 80 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019
Highest in the ZIP: 61.34999999999998 µg/L — ROWLAND WATER DISTRICT · 56,100 people · 2019 | 2/2 | SYR4 |
| Lithium | 54 µg/L No EPA limit set Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2025 | 2/2 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 18 µg/L 30% of the EPA limit 60 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019
Highest in the ZIP: 25.4 µg/L — ROWLAND WATER DISTRICT · 56,100 people · 2019 | 2/2 | SYR4 |
| Chloroform | 20.44999999999999 µg/L No EPA limit set Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019
Highest in the ZIP: 24.575 µg/L — ROWLAND WATER DISTRICT · 56,100 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 14 µg/L No EPA limit set Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019
Highest in the ZIP: 22.325 µg/L — ROWLAND WATER DISTRICT · 56,100 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 16 µg/L No EPA limit set Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019
Highest in the ZIP: 19.389999999999997 µg/L — ROWLAND WATER DISTRICT · 56,100 people · 2019 | 2/2 | SYR4 |
| Chromium | 16.7 µg/L 17% of the EPA limit 100 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 11 µg/L No EPA limit set Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019
Highest in the ZIP: 13.229999999999995 µg/L — ROWLAND WATER DISTRICT · 56,100 people · 2019 | 2/2 | SYR4 |
| Bromoform | 6.9750000000000005 µg/L No EPA limit set Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019
Highest in the ZIP: 8.459999999999992 µg/L — ROWLAND WATER DISTRICT · 56,100 people · 2019 | 2/2 | SYR4 |
| Trichloroethylene | 7.7 µg/L 154% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 7.499999999999991 µg/L No EPA limit set Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 4.6 µg/L No EPA limit set Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019
Highest in the ZIP: 7.2 µg/L — ROWLAND WATER DISTRICT · 56,100 people · 2019 | 2/2 | SYR4 |
| 1,1-Dichloroethylene | 3.7 µg/L 53% of the EPA limit 7 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 3.19 µg/L No EPA limit set Highest in the ZIP: ROWLAND WATER DISTRICT · 56,100 people · 2019 | 1/2 | SYR4 |
| Arsenic | 2.49 µg/L 25% of the EPA limit 10 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 2.21265 µg/L 7.4% of the EPA limit 30 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2016 | 1/2 | SYR4 |
| Tetrachloroethylene | 1.9 µg/L 38% of the EPA limit 5 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| Chlorobenzene | 1.3289999999999997 µg/L 1.3% of the EPA limit 100 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| trans-1,2-Dichloroethylene | 1.3 µg/L 1.3% of the EPA limit 100 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| cis-1,2-Dichloroethylene | 1.2 µg/L 1.7% of the EPA limit 70 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1 µg/L No EPA limit set Highest in the ZIP: ROWLAND WATER DISTRICT · 56,100 people · 2019 | 1/2 | SYR4 |
| Carbon Tetrachloride | 0.6590 µg/L 13% of the EPA limit 5 µg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0062 µg/L No EPA limit set Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2025
Highest in the ZIP: 0.0100 µg/L — ROWLAND WATER DISTRICT · 56,100 people · 2023 | 2/2 | UCMR-5 |
| PFBS | 0.0036 µg/L No EPA limit set Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2025 | 1/2 | UCMR-5 |
| Pfpea | 0.0035 µg/L No EPA limit set Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2025 | 1/2 | UCMR-5 |
| Pfhxa | 0.0033 µg/L No EPA limit set Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: SUBURBAN WATER SYSTEMS-SAN JOSE · 168,843 people · 2025 | 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 91792
| Supplier | State | Population served |
|---|---|---|
| SUBURBAN WATER SYSTEMS-SAN JOSE | CA | 168,843 |
| ROWLAND WATER DISTRICT | CA | 56,100 |
Frequently asked questions about ZIP 91792 tap water
Is the tap water in ZIP 91792 safe to drink?
EPA testing detected 31 contaminants across the water suppliers serving ZIP 91792. 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 91792?
2 public water suppliers report EPA drinking-water monitoring for ZIP 91792. Each is listed above with its population served.
What contaminants are in ZIP 91792's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.