What was found in ZIP 92591
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 | 5100 µg/L 51% of the EPA limit 10000 µg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Fluoride | 3600 µg/L 90% of the EPA limit 4000 µg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Barium | 222 µg/L 11% of the EPA limit 2000 µg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Nitrite | 120 µg/L 12% of the EPA limit 1000 µg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| TTHM | 54 µg/L 68% of the EPA limit 80 µg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Lithium | 44 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2024 | 1/1 | UCMR-5 |
| Monochloroacetic Acid | 30 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Bromoform | 26.1 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 21 µg/L 35% of the EPA limit 60 µg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Arsenic | 18 µg/L 180% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 16.05 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 13 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Chloroform | 10 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 9.64402 µg/L 32% of the EPA limit 30 µg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Selenium | 6.82 µg/L 14% of the EPA limit 50 µg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 6.2 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 4.76 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 4.52 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Chromium | 3.86 µg/L 3.9% of the EPA limit 100 µg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 2.68 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Dichloromethane | 0.6900 µg/L 14% of the EPA limit 5 µg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| Pentachlorophenol | 0.3300 µg/L 33% of the EPA limit 1 µg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2019 | 1/1 | SYR4 |
| PFOS | 0.0160 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2024 | 1/1 | UCMR-5 |
| PFOA | 0.0110 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2024 | 1/1 | UCMR-5 |
| Pfba | 0.0078 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2024 | 1/1 | UCMR-5 |
| Pfpea | 0.0077 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2024 | 1/1 | UCMR-5 |
| PFBS | 0.0073 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2024 | 1/1 | UCMR-5 |
| PFHXS | 0.0067 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2024 | 1/1 | UCMR-5 |
| Pfhxa | 0.0066 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2024 | 1/1 | UCMR-5 |
| Pfhpa | 0.0033 µg/L No EPA limit set Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2024 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: RANCHO CALIFORNIA WATER DISTRICT · 146,147 people · 2025 | 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 92591
| Supplier | State | Population served |
|---|---|---|
| RANCHO CALIFORNIA WATER DISTRICT | CA | 146,147 |
Frequently asked questions about ZIP 92591 tap water
Is the tap water in ZIP 92591 safe to drink?
EPA testing detected 31 contaminants across the water suppliers serving ZIP 92591. 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 92591?
1 public water supplier report EPA drinking-water monitoring for ZIP 92591. Each is listed above with its population served.
What contaminants are in ZIP 92591's water?
EPA monitoring detected Nitrate, Fluoride, Barium, Nitrite, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.