What was found in ZIP 90723
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 | 610.2 µg/L 6.1% of the EPA limit 10000 µg/L Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019
Highest in the ZIP: 2486 µg/L — GSWC - HOLLYDALE · 8,099 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 1900 µg/L 19% of the EPA limit 10000 µg/L Highest in the ZIP: GSWC - HOLLYDALE · 8,099 people · 2018 | 1/2 | SYR4 |
| Fluoride | 380 µg/L 9.5% of the EPA limit 4000 µg/L Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019
Highest in the ZIP: 494 µg/L — GSWC - HOLLYDALE · 8,099 people · 2019 | 2/2 | SYR4 |
| Barium | 163.5 µg/L 8.2% of the EPA limit 2000 µg/L Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019
Highest in the ZIP: 252.5 µg/L — GSWC - HOLLYDALE · 8,099 people · 2018 | 2/2 | SYR4 |
| Lithium | 56 µg/L No EPA limit set Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2025 | 1/2 | UCMR-5 |
| TTHM | 33.92 µg/L 42% of the EPA limit 80 µg/L Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 20.33 µg/L 34% of the EPA limit 60 µg/L Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 2/2 | SYR4 |
| Arsenic | 19.2 µg/L 192% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 2/2 | SYR4 |
| Chloroform | 13.67 µg/L No EPA limit set Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 11.1 µg/L No EPA limit set Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 10.025 µg/L No EPA limit set Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 9.749 µg/L No EPA limit set Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 6.167 µg/L No EPA limit set Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 6.137 µg/L No EPA limit set Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 5.805 µg/L No EPA limit set Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 2/2 | SYR4 |
| Bromoform | 4.1285 µg/L No EPA limit set Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 3.10665 µg/L 10% of the EPA limit 30 µg/L Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019
Highest in the ZIP: 3.9932 µg/L — GSWC - HOLLYDALE · 8,099 people · 2018 | 2/2 | SYR4 |
| Copper | 3 µg/L 0.2% of the EPA limit 1300 µg/L Highest in the ZIP: GSWC - HOLLYDALE · 8,099 people · 2018 | 1/2 | SYR4 |
| Monobromoacetic Acid | 2.0415 µg/L No EPA limit set Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 2/2 | SYR4 |
| Dichloromethane | 1.1 µg/L 22% of the EPA limit 5 µg/L Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2019 | 1/2 | SYR4 |
| Ethylene Dibromide | 0.0250 µg/L 50% of the EPA limit 0.0500 µg/L Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2017 | 1/2 | SYR4 |
| Pfba | 0.0055 µg/L No EPA limit set Highest in the ZIP: GSWC - HOLLYDALE · 8,099 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: PARAMOUNT - CITY, WATER DEPT. · 55,200 people · 2025 | 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 90723
| Supplier | State | Population served |
|---|---|---|
| PARAMOUNT - CITY, WATER DEPT. | CA | 55,200 |
| GSWC - HOLLYDALE | CA | 8,099 |
Frequently asked questions about ZIP 90723 tap water
Is the tap water in ZIP 90723 safe to drink?
EPA testing detected 23 contaminants across the water suppliers serving ZIP 90723. 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 90723?
2 public water suppliers report EPA drinking-water monitoring for ZIP 90723. Each is listed above with its population served.
What contaminants are in ZIP 90723's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Barium, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.