What was found in ZIP 93551
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 | 925900 µg/L 9259% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019 | 3/3 | SYR4 |
| Nitrate | 4113.2 µg/L 41% of the EPA limit 10000 µg/L Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019
Highest in the ZIP: 10170 µg/L — PALM RANCH IRRIGATION DIST. · 5,507 people · 2019 | 3/3 | SYR4 |
| Fluoride | 378.6 µg/L 9.5% of the EPA limit 4000 µg/L Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019
Highest in the ZIP: 816.5 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 3/3 | SYR4 |
| Barium | 120 µg/L 6% of the EPA limit 2000 µg/L Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019 | 2/3 | SYR4 |
| TTHM | 76 µg/L 95% of the EPA limit 80 µg/L Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019
Highest in the ZIP: 84.185 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 29 µg/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019
Highest in the ZIP: 37.57 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 3/3 | SYR4 |
| Arsenic | 6.26 µg/L 63% of the EPA limit 10 µg/L Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019
Highest in the ZIP: 30 µg/L — PALM RANCH IRRIGATION DIST. · 5,507 people · 2019 | 3/3 | SYR4 |
| Bromoform | 22 µg/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019
Highest in the ZIP: 28.895 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 3/3 | SYR4 |
| Lithium | 28.1 µg/L No EPA limit set Highest in the ZIP: QUARTZ HILL WATER DIST. · 19,100 people · 2025 | 2/3 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 12 µg/L 20% of the EPA limit 60 µg/L Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019
Highest in the ZIP: 20.125 µg/L — PALM RANCH IRRIGATION DIST. · 5,507 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 19 µg/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019
Highest in the ZIP: 19.815 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 3/3 | SYR4 |
| Chloroform | 12 µg/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019
Highest in the ZIP: 17.41 µg/L — PALM RANCH IRRIGATION DIST. · 5,507 people · 2019 | 3/3 | SYR4 |
| Chromium | 10 µg/L 10% of the EPA limit 100 µg/L Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019
Highest in the ZIP: 15.4 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 2/3 | SYR4 |
| Dibromoacetic Acid | 7.1 µg/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019
Highest in the ZIP: 13.84 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 13 µg/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019 | 3/3 | SYR4 |
| Combined Uranium | 6.17725 µg/L 21% of the EPA limit 30 µg/L Main supplier: PALMDALE WATER DIST. · 126,804 people · 2016
Highest in the ZIP: 11.0037 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 3/3 | SYR4 |
| Lead | 9.79 µg/L 65% of the EPA limit 15 µg/L Highest in the ZIP: QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 1/3 | SYR4 |
| Gross Beta Particle Activity | 9.46 pCi/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019 | 1/3 | SYR4 |
| Dichloroacetic Acid | 3.4 µg/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019
Highest in the ZIP: 6.07 µg/L — PALM RANCH IRRIGATION DIST. · 5,507 people · 2019 | 3/3 | SYR4 |
| Monochloroacetic Acid | 2.7 µg/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019 | 1/3 | SYR4 |
| Monobromoacetic Acid | 1.9 µg/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2019 | 3/3 | SYR4 |
| Pfhxa | 0.0063 µg/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2025 | 1/3 | UCMR-5 |
| Pfpea | 0.0046 µg/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2025 | 1/3 | UCMR-5 |
| PFBS | 0.0045 µg/L No EPA limit set Main supplier: PALMDALE WATER DIST. · 126,804 people · 2025 | 1/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: PALMDALE WATER DIST. · 126,804 people · 2024 | 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 93551
| Supplier | State | Population served |
|---|---|---|
| PALMDALE WATER DIST. | CA | 126,804 |
| QUARTZ HILL WATER DIST. | CA | 19,100 |
| PALM RANCH IRRIGATION DIST. | CA | 5,507 |
Frequently asked questions about ZIP 93551 tap water
Is the tap water in ZIP 93551 safe to drink?
EPA testing detected 25 contaminants across the water suppliers serving ZIP 93551. 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 93551?
3 public water suppliers report EPA drinking-water monitoring for ZIP 93551. Each is listed above with its population served.
What contaminants are in ZIP 93551'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.