What was found in ZIP 91723
The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 13108 µg/L 131% of the EPA limit, in the worst sample — 10000 µg/L | 3/5 | SYR4 |
| Nitrate-Nitrite | 11000 µg/L 110% of the EPA limit, in the worst sample — 10000 µg/L | 2/5 | SYR4 |
| Fluoride | 500 µg/L 13% of the EPA limit 4000 µg/L | 3/5 | SYR4 |
| Barium | 230 µg/L 12% of the EPA limit 2000 µg/L | 3/5 | SYR4 |
| TTHM | 120 µg/L 150% of the EPA limit, in the worst sample — 80 µg/L | 5/5 | SYR4 |
| Chloroform | 72 µg/L No EPA limit set | 5/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 62 µg/L 103% of the EPA limit, in the worst sample — 60 µg/L | 5/5 | SYR4 |
| Lithium | 54 µg/L No EPA limit set | 4/5 | UCMR-5 |
| Dibromochloromethane | 47 µg/L No EPA limit set | 5/5 | SYR4 |
| Bromodichloromethane | 38 µg/L No EPA limit set | 5/5 | SYR4 |
| Bromoform | 36 µg/L No EPA limit set | 5/5 | SYR4 |
| Dichloroacetic Acid | 35 µg/L No EPA limit set | 5/5 | SYR4 |
| Arsenic | 34 µg/L 340% of the EPA limit, in the worst sample — 10 µg/L | 2/5 | SYR4 |
| Combined Uranium | 31.29 µg/L 104% of the EPA limit, in the worst sample — 30 µg/L | 3/5 | SYR4 |
| Dibromoacetic Acid | 28 µg/L No EPA limit set | 5/5 | SYR4 |
| Trichloroacetic Acid | 27 µg/L No EPA limit set | 5/5 | SYR4 |
| Monochloroacetic Acid | 25.3 µg/L No EPA limit set | 1/5 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 22 µg/L 367% of the EPA limit, in the worst sample — 6 µg/L | 2/5 | SYR4 |
| Chromium | 17 µg/L 17% of the EPA limit 100 µg/L | 1/5 | SYR4 |
| 1,1-Dichloroethylene | 16 µg/L 229% of the EPA limit, in the worst sample — 7 µg/L | 1/5 | SYR4 |
| Trichloroethylene | 14 µg/L 280% of the EPA limit, in the worst sample — 5 µg/L | 1/5 | SYR4 |
| Tetrachloroethylene | 7.8 µg/L 156% of the EPA limit, in the worst sample — 5 µg/L | 2/5 | SYR4 |
| Monobromoacetic Acid | 6.7 µg/L No EPA limit set | 3/5 | SYR4 |
| Selenium | 5.2 µg/L 10% of the EPA limit 50 µg/L | 1/5 | SYR4 |
| Chlorobenzene | 1.4 µg/L 1.4% of the EPA limit 100 µg/L | 1/5 | SYR4 |
| trans-1,2-Dichloroethylene | 1.3 µg/L 1.3% of the EPA limit 100 µg/L | 1/5 | SYR4 |
| cis-1,2-Dichloroethylene | 1.2 µg/L 1.7% of the EPA limit 70 µg/L | 1/5 | SYR4 |
| Carbon Tetrachloride | 0.6700 µg/L 13% of the EPA limit 5 µg/L | 1/5 | SYR4 |
| PFOA | 0.0077 µg/L No EPA limit set | 2/5 | UCMR-5 |
| Pfba | 0.0062 µg/L No EPA limit set | 1/5 | UCMR-5 |
| PFOS | 0.0058 µg/L No EPA limit set | 2/5 | UCMR-5 |
| PFBS | 0.0044 µg/L No EPA limit set | 2/5 | UCMR-5 |
| Pfhxa | 0.0043 µg/L No EPA limit set | 3/5 | UCMR-5 |
| Pfpea | 0.0040 µg/L No EPA limit set | 2/5 | UCMR-5 |
| PFHXS | 0.0036 µg/L No EPA limit set | 1/5 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 5/5 | 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 single worst sample on
record — over 100% is worth reading, but is not by itself a violation.
Formal violations are listed separately.
Water suppliers serving ZIP 91723
| Supplier | State | Population served |
|---|---|---|
| SUBURBAN WATER SYSTEMS-SAN JOSE | CA | 168,843 |
| AZUSA LIGHT AND WATER | CA | 110,044 |
| WALNUT VALLEY WATER DISTRICT | CA | 100,941 |
| COVINA-CITY, WATER DEPT. | CA | 33,300 |
| VALENCIA HEIGHTS WATER CO. | CA | 7,775 |
Frequently asked questions about ZIP 91723 tap water
Is the tap water in ZIP 91723 safe to drink?
EPA testing detected 36 contaminants across the water suppliers serving ZIP 91723. 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 91723?
5 public water suppliers report EPA drinking-water monitoring for ZIP 91723. Each is listed above with its population served.
What contaminants are in ZIP 91723'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.