What was found in ZIP 92321
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 | 700 µg/L 7% of the EPA limit 10000 µg/L Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 689.5 µg/L 6.9% of the EPA limit 10000 µg/L Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Fluoride | 220 µg/L 5.5% of the EPA limit 4000 µg/L Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 178.8 µg/L 596% of the EPA limit, at the 95th percentile of samples — 30 µg/L Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| TTHM | 75.59 µg/L 94% of the EPA limit 80 µg/L Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Chloroform | 46.07 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 31.29 µg/L 52% of the EPA limit 60 µg/L Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Bromoform | 27.015 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 17.26 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 17.2 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Xylenes, Total | 16 µg/L 0.2% of the EPA limit 10000 µg/L Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 15.08 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 13.075 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 7.955 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Arsenic | 5.3 µg/L 53% of the EPA limit 10 µg/L Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 3.1 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Ethylbenzene | 2.5 µg/L 0.4% of the EPA limit 700 µg/L Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1.1 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2019 | 1/1 | SYR4 |
| PFOA | 0.0140 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2024 | 1/1 | UCMR-5 |
| PFOS | 0.0072 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2024 | 1/1 | UCMR-5 |
| Pfhxa | 0.0067 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2024 | 1/1 | UCMR-5 |
| Pfhpa | 0.0057 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2024 | 1/1 | UCMR-5 |
| PFNA | 0.0046 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2024 | 1/1 | UCMR-5 |
| Pfpea | 0.0045 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2024 | 1/1 | UCMR-5 |
| Pfda | 0.0039 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2024 | 1/1 | UCMR-5 |
| PFHXS | 0.0033 µg/L No EPA limit set Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2024 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: LAKE ARROWHEAD CSD · 7,038 people · 2023 | 1/1 | 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 92321
| Supplier | State | Population served |
|---|---|---|
| LAKE ARROWHEAD CSD | CA | 7,038 |
Frequently asked questions about ZIP 92321 tap water
Is the tap water in ZIP 92321 safe to drink?
EPA testing detected 27 contaminants across the water suppliers serving ZIP 92321. 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 92321?
1 public water supplier report EPA drinking-water monitoring for ZIP 92321. Each is listed above with its population served.
What contaminants are in ZIP 92321's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Combined Uranium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.