What was found in ZIP 91741
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 | 12000 µg/L 120% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019 | 2/3 | SYR4 |
| Fluoride | 400 µg/L 10% of the EPA limit 4000 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 451.99999999999994 µg/L — GLENDORA-CITY, WATER DEPT. · 49,934 people · 2019 | 2/3 | SYR4 |
| Barium | 221.99999999999994 µg/L 11% of the EPA limit 2000 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 282 µg/L — GLENDORA-CITY, WATER DEPT. · 49,934 people · 2019 | 2/3 | SYR4 |
| TTHM | 68.39999999999998 µg/L 85% of the EPA limit 80 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 81.3 µg/L — SUBURBAN WATER SYSTEMS-GLENDORA · 5,249 people · 2019 | 3/3 | SYR4 |
| Chloroform | 29 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 48.4 µg/L — SUBURBAN WATER SYSTEMS-GLENDORA · 5,249 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 25.899999999999977 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 34.5 µg/L — SUBURBAN WATER SYSTEMS-GLENDORA · 5,249 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 21.349999999999994 µg/L 36% of the EPA limit 60 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 32.39999999999998 µg/L — SUBURBAN WATER SYSTEMS-GLENDORA · 5,249 people · 2019 | 3/3 | SYR4 |
| Bromoform | 21.5 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 25 µg/L — GLENDORA-CITY, WATER DEPT. · 49,934 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 18 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 24.25 µg/L — SUBURBAN WATER SYSTEMS-GLENDORA · 5,249 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 11.149999999999977 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 18 µg/L — SUBURBAN WATER SYSTEMS-GLENDORA · 5,249 people · 2019 | 3/3 | SYR4 |
| Arsenic | 16 µg/L 160% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019 | 2/3 | SYR4 |
| Trichloroacetic Acid | 9.734999999999996 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 15.699999999999996 µg/L — SUBURBAN WATER SYSTEMS-GLENDORA · 5,249 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 8.225 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 9.389999999999988 µg/L — SUBURBAN WATER SYSTEMS-GLENDORA · 5,249 people · 2019 | 3/3 | SYR4 |
| Combined Uranium | 5.438499999999998 µg/L 18% of the EPA limit 30 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2018 | 2/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 5.1 µg/L 85% of the EPA limit 6 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019 | 1/3 | SYR4 |
| Monobromoacetic Acid | 1.58 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019 | 2/3 | SYR4 |
| Tetrachloroethylene | 0.9975 µg/L 20% of the EPA limit 5 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019 | 1/3 | SYR4 |
| PFOA | 0.0077 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2024 | 1/3 | UCMR-5 |
| PFOS | 0.0058 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2024 | 1/3 | UCMR-5 |
| Pfhxa | 0.0035 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 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 91741
| Supplier | State | Population served |
|---|---|---|
| AZUSA LIGHT AND WATER | CA | 110,044 |
| GLENDORA-CITY, WATER DEPT. | CA | 49,934 |
| SUBURBAN WATER SYSTEMS-GLENDORA | CA | 5,249 |
Frequently asked questions about ZIP 91741 tap water
Is the tap water in ZIP 91741 safe to drink?
EPA testing detected 21 contaminants across the water suppliers serving ZIP 91741. 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 91741?
3 public water suppliers report EPA drinking-water monitoring for ZIP 91741. Each is listed above with its population served.
What contaminants are in ZIP 91741's water?
EPA monitoring detected Nitrate, Fluoride, Barium, TTHM, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.