What was found in ZIP 91740
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 | 2/3 | SYR4 |
| Fluoride | 460 µg/L 12% of the EPA limit 4000 µg/L | 2/3 | SYR4 |
| Barium | 290 µg/L 14% of the EPA limit 2000 µg/L | 2/3 | SYR4 |
| TTHM | 120 µg/L 150% of the EPA limit, in the worst sample — 80 µg/L | 3/3 | SYR4 |
| Bromoform | 66 µg/L No EPA limit set | 3/3 | SYR4 |
| Chloroform | 58 µg/L No EPA limit set | 3/3 | SYR4 |
| Lithium | 57 µg/L No EPA limit set | 1/3 | UCMR-5 |
| Dibromochloromethane | 47 µg/L No EPA limit set | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 42 µg/L 70% of the EPA limit 60 µg/L | 3/3 | SYR4 |
| Arsenic | 34 µg/L 340% of the EPA limit, in the worst sample — 10 µg/L | 2/3 | SYR4 |
| Bromodichloromethane | 34 µg/L No EPA limit set | 3/3 | SYR4 |
| Dichloroacetic Acid | 21 µg/L No EPA limit set | 3/3 | SYR4 |
| Trichloroacetic Acid | 21 µg/L No EPA limit set | 3/3 | SYR4 |
| Dibromoacetic Acid | 17 µg/L No EPA limit set | 3/3 | SYR4 |
| Combined Uranium | 6.556 µg/L 22% of the EPA limit 30 µg/L | 2/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 5.1 µg/L 85% of the EPA limit 6 µg/L | 1/3 | SYR4 |
| Monobromoacetic Acid | 1.6 µg/L No EPA limit set | 2/3 | SYR4 |
| Tetrachloroethylene | 1 µg/L 20% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| PFOA | 0.0077 µg/L No EPA limit set | 1/3 | UCMR-5 |
| PFOS | 0.0058 µg/L No EPA limit set | 2/3 | UCMR-5 |
| Pfhxa | 0.0035 µg/L No EPA limit set | 1/3 | UCMR-5 |
| Lead | 0.0021 mg/L 14% of the EPA limit 0.0150 mg/L | 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 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 91740
| Supplier | State | Population served |
|---|---|---|
| AZUSA LIGHT AND WATER | CA | 110,044 |
| GSWC-SAN DIMAS | CA | 56,538 |
| GLENDORA-CITY, WATER DEPT. | CA | 49,934 |
Frequently asked questions about ZIP 91740 tap water
Is the tap water in ZIP 91740 safe to drink?
EPA testing detected 22 contaminants across the water suppliers serving ZIP 91740. 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 91740?
3 public water suppliers report EPA drinking-water monitoring for ZIP 91740. Each is listed above with its population served.
What contaminants are in ZIP 91740's water?
EPA monitoring detected Nitrate, Fluoride, Barium, TTHM, Bromoform, and others across this ZIP's suppliers. The full list with levels and sources is above.