What was found in ZIP 91722
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 | 1/2 | SYR4 |
| Fluoride | 400 µg/L 10% of the EPA limit 4000 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019 | 1/2 | SYR4 |
| Barium | 222 µg/L 11% of the EPA limit 2000 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019 | 1/2 | SYR4 |
| TTHM | 68.4 µg/L 86% of the EPA limit 80 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 81.35 µg/L — COVINA-CITY, WATER DEPT. · 33,300 people · 2019 | 2/2 | SYR4 |
| Lithium | 47 µg/L No EPA limit set Highest in the ZIP: COVINA-CITY, WATER DEPT. · 33,300 people · 2025 | 1/2 | UCMR-5 |
| Chloroform | 29 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 42 µg/L — COVINA-CITY, WATER DEPT. · 33,300 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 21.35 µg/L 36% of the EPA limit 60 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 35.4 µg/L — COVINA-CITY, WATER DEPT. · 33,300 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 25.9 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 29.8 µg/L — COVINA-CITY, WATER DEPT. · 33,300 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 11.15 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 23 µg/L — COVINA-CITY, WATER DEPT. · 33,300 people · 2019 | 2/2 | SYR4 |
| Bromoform | 21.5 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 18 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 20 µg/L — COVINA-CITY, WATER DEPT. · 33,300 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 9.735 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 17.4 µg/L — COVINA-CITY, WATER DEPT. · 33,300 people · 2019 | 2/2 | 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 | 1/2 | 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: 10.2 µg/L — COVINA-CITY, WATER DEPT. · 33,300 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 1.58 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
Highest in the ZIP: 6.7 µg/L — COVINA-CITY, WATER DEPT. · 33,300 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 5.4385 µg/L 18% of the EPA limit 30 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2018 | 1/2 | 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 | 1/2 | SYR4 |
| Tetrachloroethylene | 0.9975 µg/L 20% of the EPA limit 5 µg/L Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019 | 1/2 | SYR4 |
| PFOA | 0.0077 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2024 | 1/2 | UCMR-5 |
| PFOS | 0.0058 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2024 | 1/2 | UCMR-5 |
| Pfhxa | 0.0035 µg/L No EPA limit set Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2024 | 1/2 | 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 | 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 91722
| Supplier | State | Population served |
|---|---|---|
| AZUSA LIGHT AND WATER | CA | 110,044 |
| COVINA-CITY, WATER DEPT. | CA | 33,300 |
Frequently asked questions about ZIP 91722 tap water
Is the tap water in ZIP 91722 safe to drink?
EPA testing detected 22 contaminants across the water suppliers serving ZIP 91722. 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 91722?
2 public water suppliers report EPA drinking-water monitoring for ZIP 91722. Each is listed above with its population served.
What contaminants are in ZIP 91722's water?
EPA monitoring detected Nitrate, Fluoride, Barium, TTHM, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.