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Tap water quality report

Ferndale, CA

EPA monitoring detected 6 contaminants across the 2 water suppliers serving Ferndale. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

2
water suppliers
408
people served
6
contaminants found
California rankings Lead in California PFAS in California

What was found in Ferndale'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
Nitrate-Nitrite
1000000 µg/L 10000%
of the EPA limit, in the worst sample — 10000 µg/L
 2/2 SYR4
Nitrate
1700 µg/L 17%
of the EPA limit 10000 µg/L
 2/2 SYR4
Barium
420 µg/L 21%
of the EPA limit 2000 µg/L
 1/2 SYR4
Fluoride
350 µg/L 8.8%
of the EPA limit 4000 µg/L
 1/2 SYR4
Thallium, Total
1 µg/L 50%
of the EPA limit 2 µg/L
 1/2 SYR4
Lead
0.00078 mg/L 5.2%
of the EPA limit 0.0150 mg/L
 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 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 Ferndale

SupplierPopulation served
RIVERSIDE CSD 333
WADDINGTON W.W. 75

Frequently asked questions about Ferndale tap water

Is Ferndale tap water safe to drink?

EPA testing detected 6 contaminants in the water serving Ferndale. 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 Ferndale?

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

What contaminants are in Ferndale's water?

The contaminants EPA monitoring detected in Ferndale include Nitrate-Nitrite, Nitrate, Barium, Fluoride, Thallium, Total. 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.