What was found in ZIP 92870
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-Nitrite | 7364 µg/L 74% of the EPA limit 10000 µg/L Highest in the ZIP: GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2019 | 1/3 | SYR4 |
| Nitrate | 7297 µg/L 73% of the EPA limit 10000 µg/L Highest in the ZIP: GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2019 | 1/3 | SYR4 |
| Fluoride | 610.5 µg/L 15% of the EPA limit 4000 µg/L Highest in the ZIP: GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2019 | 1/3 | SYR4 |
| TTHM | 30.05 µg/L 38% of the EPA limit 80 µg/L Main supplier: WESTERN MWD · 86,062 people · 2019
Highest in the ZIP: 61.62 µg/L — YORBA LINDA WATER DISTRICT · 84,292 people · 2019 | 3/3 | SYR4 |
| Lithium | 16 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2023
Highest in the ZIP: 36.3779 µg/L — YORBA LINDA WATER DISTRICT · 84,292 people · 2024 | 3/3 | UCMR-5 |
| Monochloroacetic Acid | 32.7 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2019 | 2/3 | SYR4 |
| Dibromochloromethane | 11 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2019
Highest in the ZIP: 24.78 µg/L — YORBA LINDA WATER DISTRICT · 84,292 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 23.6 µg/L 39% of the EPA limit 60 µg/L Main supplier: WESTERN MWD · 86,062 people · 2019 | 3/3 | SYR4 |
| Bromoform | 12 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2019
Highest in the ZIP: 19.47 µg/L — YORBA LINDA WATER DISTRICT · 84,292 people · 2019 | 3/3 | SYR4 |
| Chloroform | 13 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2019
Highest in the ZIP: 18.32 µg/L — YORBA LINDA WATER DISTRICT · 84,292 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 8.35 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2019
Highest in the ZIP: 17 µg/L — GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 6.185 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2019
Highest in the ZIP: 11.28 µg/L — YORBA LINDA WATER DISTRICT · 84,292 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 4.9 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2019
Highest in the ZIP: 9.26 µg/L — YORBA LINDA WATER DISTRICT · 84,292 people · 2019 | 3/3 | SYR4 |
| Combined Uranium | 9.00556 µg/L 30% of the EPA limit 30 µg/L Highest in the ZIP: GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2017 | 1/3 | SYR4 |
| Selenium | 7.57 µg/L 15% of the EPA limit 50 µg/L Highest in the ZIP: GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2019 | 1/3 | SYR4 |
| Trichloroacetic Acid | 3.37 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2019
Highest in the ZIP: 7.02 µg/L — GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2019 | 3/3 | SYR4 |
| Monobromoacetic Acid | 3.195 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2019
Highest in the ZIP: 3.58 µg/L — GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2019 | 3/3 | SYR4 |
| Gross Beta Particle Activity | 2.19 pCi/L No EPA limit set Highest in the ZIP: GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2014 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 0.5002 pCi/L 10% of the EPA limit 5 pCi/L Highest in the ZIP: GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2013 | 1/3 | SYR4 |
| Pfba | 0.0206 µg/L No EPA limit set Highest in the ZIP: YORBA LINDA WATER DISTRICT · 84,292 people · 2024 | 2/3 | UCMR-5 |
| Pfpea | 0.0047 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2023
Highest in the ZIP: 0.0109 µg/L — GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2025 | 3/3 | UCMR-5 |
| Pfhxa | 0.0077 µg/L No EPA limit set Highest in the ZIP: GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2025 | 1/3 | UCMR-5 |
| PFOS | 0.0065 µg/L No EPA limit set Highest in the ZIP: GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2025 | 1/3 | UCMR-5 |
| PFOA | 0.0060 µg/L No EPA limit set Highest in the ZIP: GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2025 | 1/3 | UCMR-5 |
| PFBS | 0.0030 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2023
Highest in the ZIP: 0.0056 µg/L — GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2025 | 2/3 | UCMR-5 |
| PFHXS | 0.0034 µg/L No EPA limit set Main supplier: WESTERN MWD · 86,062 people · 2023
Highest in the ZIP: 0.0036 µg/L — GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2025 | 2/3 | UCMR-5 |
| Lead | 0.0013 mg/L 8.7% of the EPA limit 0.0150 mg/L Main supplier: WESTERN MWD · 86,062 people · 2025
Highest in the ZIP: 0.0025 mg/L — GOLDEN STATE WC - PLACENTIA/YORBA LINDA · 50,381 people · 2025 | 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 92870
| Supplier | State | Population served |
|---|---|---|
| WESTERN MWD | CA | 86,062 |
| YORBA LINDA WATER DISTRICT | CA | 84,292 |
| GOLDEN STATE WC - PLACENTIA/YORBA LINDA | CA | 50,381 |
Frequently asked questions about ZIP 92870 tap water
Is the tap water in ZIP 92870 safe to drink?
EPA testing detected 27 contaminants across the water suppliers serving ZIP 92870. 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 92870?
3 public water suppliers report EPA drinking-water monitoring for ZIP 92870. Each is listed above with its population served.
What contaminants are in ZIP 92870's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, TTHM, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.