What was found in ZIP 95422
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 | 678 µg/L 6.8% of the EPA limit 10000 µg/L Highest in the ZIP: KONOCTI COUNTY WATER DISTRICT · 5,928 people · 2019 | 2/3 | SYR4 |
| Fluoride | 200 µg/L 5% of the EPA limit 4000 µg/L Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019
Highest in the ZIP: 210 µg/L — KONOCTI COUNTY WATER DISTRICT · 5,928 people · 2019 | 3/3 | SYR4 |
| Barium | 110 µg/L 5.5% of the EPA limit 2000 µg/L Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019
Highest in the ZIP: 140 µg/L — KONOCTI COUNTY WATER DISTRICT · 5,928 people · 2019 | 3/3 | SYR4 |
| TTHM | 87.423 µg/L 109% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019
Highest in the ZIP: 88.8 µg/L — GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM · 4,644 people · 2019 | 3/3 | SYR4 |
| Chloroform | 70.409 µg/L No EPA limit set Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 68.36 µg/L 114% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 43.9 µg/L No EPA limit set Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019 | 3/3 | SYR4 |
| Bromate | 10.79 µg/L 108% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019
Highest in the ZIP: 36.2 µg/L — KONOCTI COUNTY WATER DISTRICT · 5,928 people · 2019 | 2/3 | SYR4 |
| Lithium | 25 µg/L No EPA limit set Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2024
Highest in the ZIP: 27.5 µg/L — GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM · 4,644 people · 2023 | 3/3 | UCMR-5 |
| Trichloroacetic Acid | 17.26 µg/L No EPA limit set Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019
Highest in the ZIP: 19.15 µg/L — GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM · 4,644 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 17.96 µg/L No EPA limit set Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019 | 3/3 | SYR4 |
| Monochloroacetic Acid | 8.05 µg/L No EPA limit set Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 4.6475 µg/L No EPA limit set Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019
Highest in the ZIP: 6.315 µg/L — KONOCTI COUNTY WATER DISTRICT · 5,928 people · 2019 | 3/3 | SYR4 |
| Arsenic | 2.57 µg/L 26% of the EPA limit 10 µg/L Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019
Highest in the ZIP: 6.045 µg/L — KONOCTI COUNTY WATER DISTRICT · 5,928 people · 2019 | 3/3 | SYR4 |
| Monobromoacetic Acid | 1.3 µg/L No EPA limit set Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019
Highest in the ZIP: 5.23 µg/L — GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM · 4,644 people · 2019 | 2/3 | SYR4 |
| Bromoform | 1.7775 µg/L No EPA limit set Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019
Highest in the ZIP: 2.8955 µg/L — KONOCTI COUNTY WATER DISTRICT · 5,928 people · 2019 | 2/3 | SYR4 |
| Dibromoacetic Acid | 2.34 µg/L No EPA limit set Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2019
Highest in the ZIP: 2.665 µg/L — KONOCTI COUNTY WATER DISTRICT · 5,928 people · 2019 | 3/3 | SYR4 |
| Pfba | 0.0082 µg/L No EPA limit set Highest in the ZIP: KONOCTI COUNTY WATER DISTRICT · 5,928 people · 2023 | 1/3 | UCMR-5 |
| Lead | 0.0046 mg/L 31% of the EPA limit 0.0150 mg/L Main supplier: HIGHLANDS MUTUAL WATER COMPANY · 7,772 people · 2023 | 3/3 | LCR |
| Pfpea | 0.0039 µg/L No EPA limit set Highest in the ZIP: KONOCTI COUNTY WATER DISTRICT · 5,928 people · 2023 | 1/3 | UCMR-5 |
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 95422
| Supplier | State | Population served |
|---|---|---|
| HIGHLANDS MUTUAL WATER COMPANY | CA | 7,772 |
| KONOCTI COUNTY WATER DISTRICT | CA | 5,928 |
| GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM | CA | 4,644 |
Frequently asked questions about ZIP 95422 tap water
Is the tap water in ZIP 95422 safe to drink?
EPA testing detected 20 contaminants across the water suppliers serving ZIP 95422. 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 95422?
3 public water suppliers report EPA drinking-water monitoring for ZIP 95422. Each is listed above with its population served.
What contaminants are in ZIP 95422's water?
EPA monitoring detected Nitrate, Fluoride, Barium, TTHM, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.