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Tap water quality report

Mckinleyville, CA

EPA monitoring detected 9 contaminants across the 2 water suppliers serving Mckinleyville. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
18,745
people served
9
contaminants found
California rankings Lead in California PFAS in California

What was found in Mckinleyville's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
TTHM
36 µg/L 45%
of the EPA limit 80 µg/L
Main supplier: MCKINLEYVILLE C.S.D. · 16,900 people · 2019
2/2 SYR4
Chloroform
27.999999999999996 µg/L
No EPA limit set
Main supplier: MCKINLEYVILLE C.S.D. · 16,900 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
20.799999999999997 µg/L 35%
of the EPA limit 60 µg/L
Main supplier: MCKINLEYVILLE C.S.D. · 16,900 people · 2019
2/2 SYR4
Trichloroacetic Acid
10.8 µg/L
No EPA limit set
Main supplier: MCKINLEYVILLE C.S.D. · 16,900 people · 2019
2/2 SYR4
Dichloroacetic Acid
8.1 µg/L
No EPA limit set
Main supplier: MCKINLEYVILLE C.S.D. · 16,900 people · 2019
2/2 SYR4
Bromodichloromethane
6.659999999999999 µg/L
No EPA limit set
Main supplier: MCKINLEYVILLE C.S.D. · 16,900 people · 2019
2/2 SYR4
Monochloroacetic Acid
2.5 µg/L
No EPA limit set
Main supplier: MCKINLEYVILLE C.S.D. · 16,900 people · 2019
1/2 SYR4
Dibromochloromethane
1.59 µg/L
No EPA limit set
Main supplier: MCKINLEYVILLE C.S.D. · 16,900 people · 2019
Highest in the city: 1.8 µg/L — FIELDBROOK GLENDALE C.S.D. · 1,845 people · 2016
2/2 SYR4
Lead
0.0018 mg/L 12%
of the EPA limit 0.0150 mg/L
Main supplier: MCKINLEYVILLE C.S.D. · 16,900 people · 2026
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. 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 Mckinleyville

SupplierPopulation served
MCKINLEYVILLE C.S.D. 16,900
FIELDBROOK GLENDALE C.S.D. 1,845

Frequently asked questions about Mckinleyville tap water

Is Mckinleyville tap water safe to drink?

EPA testing detected 9 contaminants in the water serving Mckinleyville. 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 Mckinleyville?

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

What contaminants are in Mckinleyville's water?

The contaminants EPA monitoring detected in Mckinleyville include TTHM, Chloroform, Total Haloacetic Acids (HAA5), Trichloroacetic Acid, Dichloroacetic Acid. The full list, with the level at the main supplier 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.