Tap WaterIndex

← California

Tap water quality report

Arcata, CA

EPA monitoring detected 10 contaminants across the 3 water suppliers serving Arcata. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

3
water suppliers
22,549
people served
10
contaminants found
California rankings Lead in California PFAS in California

What was found in Arcata's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Barium
130 µg/L 6.5%
of the EPA limit 2000 µg/L
 1/3 SYR4
Total Haloacetic Acids (HAA5)
22 µg/L 37%
of the EPA limit 60 µg/L
 3/3 SYR4
TTHM
20 µg/L 25%
of the EPA limit 80 µg/L
 3/3 SYR4
Chloroform
13 µg/L
No EPA limit set
 3/3 SYR4
Monochloroacetic Acid
10 µg/L
No EPA limit set
 1/3 SYR4
Trichloroacetic Acid
6.4 µg/L
No EPA limit set
 3/3 SYR4
Bromodichloromethane
6.2 µg/L
No EPA limit set
 3/3 SYR4
Dichloroacetic Acid
5.2 µg/L
No EPA limit set
 3/3 SYR4
Dibromochloromethane
2.9 µg/L
No EPA limit set
 3/3 SYR4
Lead
0.0036 mg/L 24%
of the EPA limit 0.0150 mg/L
 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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Arcata

SupplierPopulation served
ARCATA, CITY OF 20,875
JACOBY CREEK CWD 924
MANILA COMMUNITY SERVICES DIST. 750

Frequently asked questions about Arcata tap water

Is Arcata tap water safe to drink?

EPA testing detected 10 contaminants in the water serving Arcata. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Arcata?

3 public water suppliers report drinking-water monitoring for Arcata, California to the EPA. Each is listed above with its population served.

What contaminants are in Arcata's water?

The contaminants EPA monitoring detected in Arcata include Barium, Total Haloacetic Acids (HAA5), TTHM, Chloroform, Monochloroacetic Acid. The full list, with the highest level found and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.