What was found in ZIP 93536
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 | 4539.999999999999 µg/L 45% of the EPA limit 10000 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the ZIP: 736000 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 4/4 | SYR4 |
| Nitrate | 4102.5 µg/L 41% of the EPA limit 10000 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the ZIP: 10170 µg/L — PALM RANCH IRRIGATION DIST. · 5,507 people · 2019 | 4/4 | SYR4 |
| Fluoride | 685.1 µg/L 17% of the EPA limit 4000 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the ZIP: 816.4999999999999 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 4/4 | SYR4 |
| Barium | 100 µg/L 5% of the EPA limit 2000 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the ZIP: 109 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 2/4 | SYR4 |
| TTHM | 80.29999999999998 µg/L 100% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the ZIP: 84.185 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 25 µg/L 42% of the EPA limit 60 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2017
Highest in the ZIP: 44.8 µg/L — CALIFORNIA WATER SERVICE CO.-LANCASTER · 1,387 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 34.925 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the ZIP: 37.56999999999999 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 4/4 | SYR4 |
| Bromoform | 31.27 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 4/4 | SYR4 |
| Arsenic | 28.769999999999982 µg/L 288% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the ZIP: 30 µg/L — PALM RANCH IRRIGATION DIST. · 5,507 people · 2019 | 4/4 | SYR4 |
| Lithium | 17.1 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2024
Highest in the ZIP: 28.1 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2025 | 4/4 | UCMR-5 |
| Dichloroacetic Acid | 8.724 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2017
Highest in the ZIP: 24.85 µg/L — CALIFORNIA WATER SERVICE CO.-LANCASTER · 1,387 people · 2019 | 4/4 | SYR4 |
| Bromodichloromethane | 18.564999999999994 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the ZIP: 19.81499999999999 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 4/4 | SYR4 |
| Chloroform | 9.15 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the ZIP: 17.41 µg/L — PALM RANCH IRRIGATION DIST. · 5,507 people · 2019 | 4/4 | SYR4 |
| Dibromoacetic Acid | 17.07 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2017 | 4/4 | SYR4 |
| Trichloroacetic Acid | 4.679999999999998 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2017
Highest in the ZIP: 16.85 µg/L — CALIFORNIA WATER SERVICE CO.-LANCASTER · 1,387 people · 2019 | 4/4 | SYR4 |
| Chromium | 16.099999999999994 µg/L 16% of the EPA limit 100 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 3/4 | SYR4 |
| Combined Uranium | 7.673500000000003 µg/L 26% of the EPA limit 30 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the ZIP: 11.00365 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 4/4 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 10.61 µg/L 177% of the EPA limit, at the 95th percentile of samples — 6 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 1/4 | SYR4 |
| Lead | 6.17 µg/L 41% of the EPA limit 15 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the ZIP: 9.79 µg/L — QUARTZ HILL WATER DIST. · 19,100 people · 2019 | 2/4 | SYR4 |
| Selenium | 7.02 µg/L 14% of the EPA limit 50 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 1/4 | SYR4 |
| Monochloroacetic Acid | 3.775 µg/L No EPA limit set Highest in the ZIP: CALIFORNIA WATER SERVICE CO.-LANCASTER · 1,387 people · 2019 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 2.9 pCi/L 58% of the EPA limit 5 pCi/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 1/4 | SYR4 |
| Monobromoacetic Acid | 2.6889999999999996 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2017 | 4/4 | SYR4 |
| Toluene | 0.5710 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0018 mg/L 12% of the EPA limit 0.0150 mg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2025 | 4/4 | 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 93536
| Supplier | State | Population served |
|---|---|---|
| LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER | CA | 208,129 |
| QUARTZ HILL WATER DIST. | CA | 19,100 |
| PALM RANCH IRRIGATION DIST. | CA | 5,507 |
| CALIFORNIA WATER SERVICE CO.-LANCASTER | CA | 1,387 |
Frequently asked questions about ZIP 93536 tap water
Is the tap water in ZIP 93536 safe to drink?
EPA testing detected 25 contaminants across the water suppliers serving ZIP 93536. 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 93536?
4 public water suppliers report EPA drinking-water monitoring for ZIP 93536. Each is listed above with its population served.
What contaminants are in ZIP 93536'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.