What was found in ZIP 92704
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 | 788000 µg/L 7880% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
Highest in the ZIP: 865500 µg/L — MESA WATER DISTRICT · 110,000 people · 2019 | 2/2 | SYR4 |
| Nitrate | 7141.6 µg/L 71% of the EPA limit 10000 µg/L Main supplier: CITY OF SANTA ANA · 310,539 people · 2019 | 2/2 | SYR4 |
| Fluoride | 470 µg/L 12% of the EPA limit 4000 µg/L Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
Highest in the ZIP: 850 µg/L — MESA WATER DISTRICT · 110,000 people · 2019 | 2/2 | SYR4 |
| Barium | 160.9 µg/L 8% of the EPA limit 2000 µg/L Main supplier: CITY OF SANTA ANA · 310,539 people · 2019 | 1/2 | SYR4 |
| TTHM | 45.88 µg/L 57% of the EPA limit 80 µg/L Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
Highest in the ZIP: 47.9 µg/L — MESA WATER DISTRICT · 110,000 people · 2019 | 2/2 | SYR4 |
| Lithium | 38.456 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2025 | 2/2 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 18.89 µg/L 31% of the EPA limit 60 µg/L Main supplier: CITY OF SANTA ANA · 310,539 people · 2019 | 2/2 | SYR4 |
| Bromoform | 7.35 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
Highest in the ZIP: 18 µg/L — MESA WATER DISTRICT · 110,000 people · 2019 | 2/2 | SYR4 |
| Chloroform | 17.11 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 14.2 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 13.29 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
Highest in the ZIP: 14 µg/L — MESA WATER DISTRICT · 110,000 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 9.54 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 7.9566 µg/L 27% of the EPA limit 30 µg/L Main supplier: CITY OF SANTA ANA · 310,539 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 6.22 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 4.21 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
Highest in the ZIP: 5.6 µg/L — MESA WATER DISTRICT · 110,000 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 3.09 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
Highest in the ZIP: 4.055 µg/L — MESA WATER DISTRICT · 110,000 people · 2019 | 2/2 | SYR4 |
| Arsenic | 3.45 µg/L 35% of the EPA limit 10 µg/L Main supplier: CITY OF SANTA ANA · 310,539 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 2.875 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2019 | 1/2 | SYR4 |
| Gross Beta Particle Activity | 1.87 pCi/L No EPA limit set Highest in the ZIP: MESA WATER DISTRICT · 110,000 people · 2013 | 1/2 | SYR4 |
| 1,1-Dichloroethylene | 0.7850 µg/L 11% of the EPA limit 7 µg/L Main supplier: CITY OF SANTA ANA · 310,539 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 0.5463 pCi/L 11% of the EPA limit 5 pCi/L Highest in the ZIP: MESA WATER DISTRICT · 110,000 people · 2013 | 1/2 | SYR4 |
| PFOS | 0.0142 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2025 | 1/2 | UCMR-5 |
| PFOA | 0.0089 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2025 | 1/2 | UCMR-5 |
| PFHXS | 0.0084 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2025 | 1/2 | UCMR-5 |
| Pfpea | 0.0059 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2025 | 1/2 | UCMR-5 |
| Pfhxa | 0.0040 µg/L No EPA limit set Main supplier: CITY OF SANTA ANA · 310,539 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CITY OF SANTA ANA · 310,539 people · 2024 | 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 92704
| Supplier | State | Population served |
|---|---|---|
| CITY OF SANTA ANA | CA | 310,539 |
| MESA WATER DISTRICT | CA | 110,000 |
Frequently asked questions about ZIP 92704 tap water
Is the tap water in ZIP 92704 safe to drink?
EPA testing detected 27 contaminants across the water suppliers serving ZIP 92704. 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 92704?
2 public water suppliers report EPA drinking-water monitoring for ZIP 92704. Each is listed above with its population served.
What contaminants are in ZIP 92704's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.