Tap WaterIndex

← California

Tap water quality report

Fair Oaks, CA

EPA monitoring detected 13 contaminants across the 2 water suppliers serving Fair Oaks. 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
36,676
people served
13
contaminants found
California rankings Lead in California PFAS in California

What was found in Fair Oaks'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
Nitrate-Nitrite
582500 µg/L 5825%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: FAIR OAKS WATER DISTRICT · 36,226 people · 2019
1/2 SYR4
Nitrate
1935.8 µg/L 19%
of the EPA limit 10000 µg/L
Main supplier: FAIR OAKS WATER DISTRICT · 36,226 people · 2019
Highest in the city: 7853.5 µg/L — OLYMPIA MOBILODGE · 450 people · 2019
2/2 SYR4
Fluoride
110 µg/L 2.8%
of the EPA limit 4000 µg/L
Main supplier: FAIR OAKS WATER DISTRICT · 36,226 people · 2019
Highest in the city: 130 µg/L — OLYMPIA MOBILODGE · 450 people · 2017
2/2 SYR4
Barium
110 µg/L 5.5%
of the EPA limit 2000 µg/L
Highest in the city: OLYMPIA MOBILODGE · 450 people · 2017
1/2 SYR4
Chromium
10 µg/L 10%
of the EPA limit 100 µg/L
Highest in the city: OLYMPIA MOBILODGE · 450 people · 2017
1/2 SYR4
Arsenic
4.48 µg/L 45%
of the EPA limit 10 µg/L
Main supplier: FAIR OAKS WATER DISTRICT · 36,226 people · 2019
Highest in the city: 5.285 µg/L — OLYMPIA MOBILODGE · 450 people · 2017
2/2 SYR4
Combined Uranium
4.8574 µg/L 16%
of the EPA limit 30 µg/L
Main supplier: FAIR OAKS WATER DISTRICT · 36,226 people · 2018
1/2 SYR4
PFOA
0.0042 µg/L
No EPA limit set
Highest in the city: OLYMPIA MOBILODGE · 450 people · 2025
1/2 UCMR-5
PFHXS
0.0040 µg/L
No EPA limit set
Highest in the city: OLYMPIA MOBILODGE · 450 people · 2025
1/2 UCMR-5
Pfhpa
0.0038 µg/L
No EPA limit set
Highest in the city: OLYMPIA MOBILODGE · 450 people · 2025
1/2 UCMR-5
Pfpea
0.0038 µg/L
No EPA limit set
Highest in the city: OLYMPIA MOBILODGE · 450 people · 2025
1/2 UCMR-5
Pfhxa
0.0036 µg/L
No EPA limit set
Highest in the city: OLYMPIA MOBILODGE · 450 people · 2025
1/2 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: FAIR OAKS WATER DISTRICT · 36,226 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. 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 Fair Oaks

SupplierPopulation served
FAIR OAKS WATER DISTRICT 36,226
OLYMPIA MOBILODGE 450

Frequently asked questions about Fair Oaks tap water

Is Fair Oaks tap water safe to drink?

EPA testing detected 13 contaminants in the water serving Fair Oaks. 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 Fair Oaks?

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

What contaminants are in Fair Oaks's water?

The contaminants EPA monitoring detected in Fair Oaks include Nitrate-Nitrite, Nitrate, Fluoride, Barium, Chromium. 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.