What was found in ZIP 95521
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 |
|---|---|---|---|
| Barium | 130 µg/L 6.5% of the EPA limit 2000 µg/L Main supplier: ARCATA, CITY OF · 20,875 people · 2014 | 1/2 | SYR4 |
| TTHM | 18.95 µg/L 24% of the EPA limit 80 µg/L Main supplier: ARCATA, CITY OF · 20,875 people · 2019
Highest in the ZIP: 36 µg/L — MCKINLEYVILLE C.S.D. · 16,900 people · 2019 | 2/2 | SYR4 |
| Chloroform | 11 µg/L No EPA limit set Main supplier: ARCATA, CITY OF · 20,875 people · 2019
Highest in the ZIP: 28 µg/L — MCKINLEYVILLE C.S.D. · 16,900 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 11.2 µg/L 19% of the EPA limit 60 µg/L Main supplier: ARCATA, CITY OF · 20,875 people · 2019
Highest in the ZIP: 20.8 µg/L — MCKINLEYVILLE C.S.D. · 16,900 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 5.84 µg/L No EPA limit set Main supplier: ARCATA, CITY OF · 20,875 people · 2019
Highest in the ZIP: 10.8 µg/L — MCKINLEYVILLE C.S.D. · 16,900 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 9.605 µg/L No EPA limit set Main supplier: ARCATA, CITY OF · 20,875 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 4.57 µg/L No EPA limit set Main supplier: ARCATA, CITY OF · 20,875 people · 2019
Highest in the ZIP: 8.1 µg/L — MCKINLEYVILLE C.S.D. · 16,900 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 5.695 µg/L No EPA limit set Main supplier: ARCATA, CITY OF · 20,875 people · 2019
Highest in the ZIP: 6.66 µg/L — MCKINLEYVILLE C.S.D. · 16,900 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 2.9 µg/L No EPA limit set Main supplier: ARCATA, CITY OF · 20,875 people · 2019 | 2/2 | SYR4 |
| Lead | 0.0036 mg/L 24% of the EPA limit 0.0150 mg/L Main supplier: ARCATA, CITY OF · 20,875 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 95521
| Supplier | State | Population served |
|---|---|---|
| ARCATA, CITY OF | CA | 20,875 |
| MCKINLEYVILLE C.S.D. | CA | 16,900 |
Frequently asked questions about ZIP 95521 tap water
Is the tap water in ZIP 95521 safe to drink?
EPA testing detected 10 contaminants across the water suppliers serving ZIP 95521. 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 95521?
2 public water suppliers report EPA drinking-water monitoring for ZIP 95521. Each is listed above with its population served.
What contaminants are in ZIP 95521's water?
EPA monitoring detected Barium, TTHM, Chloroform, Total Haloacetic Acids (HAA5), Trichloroacetic Acid, and others across this ZIP's suppliers. The full list with levels and sources is above.