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Tap water quality report

Riverdale, CA

EPA monitoring detected 22 contaminants across the 3 water suppliers serving Riverdale. 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.

3
water suppliers
3,376
people served
22
contaminants found
California rankings Lead in California PFAS in California

What was found in Riverdale'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
Fluoride
2365 µg/L 59%
of the EPA limit 4000 µg/L
Main supplier: RIVERDALE PUBLIC UTILITY DISTRICT · 2,756 people · 2018
3/3 SYR4
Nitrate
519.8 µg/L 5.2%
of the EPA limit 10000 µg/L
Highest in the city: TERRA LINDA FARMS · 80 people · 2019
1/3 SYR4
TTHM
190 µg/L 238%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
Highest in the city: TERRA LINDA FARMS · 80 people · 2019
1/3 SYR4
Copper
110 µg/L 8.5%
of the EPA limit 1300 µg/L
Highest in the city: LANARE COMMUNITY SERVICES DIST · 540 people · 2018
1/3 SYR4
Total Haloacetic Acids (HAA5)
95.05 µg/L 158%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
Highest in the city: TERRA LINDA FARMS · 80 people · 2019
1/3 SYR4
Chloroform
74.55 µg/L
No EPA limit set
Highest in the city: TERRA LINDA FARMS · 80 people · 2019
1/3 SYR4
Dibromochloromethane
56.2 µg/L
No EPA limit set
Highest in the city: TERRA LINDA FARMS · 80 people · 2019
1/3 SYR4
Bromodichloromethane
55 µg/L
No EPA limit set
Highest in the city: TERRA LINDA FARMS · 80 people · 2019
1/3 SYR4
Trichloroacetic Acid
49.3 µg/L
No EPA limit set
Highest in the city: TERRA LINDA FARMS · 80 people · 2019
1/3 SYR4
Arsenic
40.08 µg/L 401%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Main supplier: RIVERDALE PUBLIC UTILITY DISTRICT · 2,756 people · 2018
3/3 SYR4
Dichloroacetic Acid
36.55 µg/L
No EPA limit set
Highest in the city: TERRA LINDA FARMS · 80 people · 2019
1/3 SYR4
Bromoform
31.8 µg/L
No EPA limit set
Highest in the city: TERRA LINDA FARMS · 80 people · 2019
1/3 SYR4
Dibromoacetic Acid
21.2 µg/L
No EPA limit set
Highest in the city: TERRA LINDA FARMS · 80 people · 2019
1/3 SYR4
Lead
9.125 µg/L 61%
of the EPA limit 15 µg/L
Highest in the city: LANARE COMMUNITY SERVICES DIST · 540 people · 2018
1/3 SYR4
Selenium
5.8 µg/L 12%
of the EPA limit 50 µg/L
Main supplier: RIVERDALE PUBLIC UTILITY DISTRICT · 2,756 people · 2018
1/3 SYR4
Monochloroacetic Acid
4.47 µg/L
No EPA limit set
Highest in the city: TERRA LINDA FARMS · 80 people · 2019
1/3 SYR4
Benzene
2.605 µg/L 52%
of the EPA limit 5 µg/L
Highest in the city: LANARE COMMUNITY SERVICES DIST · 540 people · 2019
1/3 SYR4
Monobromoacetic Acid
2.6 µg/L
No EPA limit set
Highest in the city: TERRA LINDA FARMS · 80 people · 2019
1/3 SYR4
Styrene
2 µg/L 2%
of the EPA limit 100 µg/L
Highest in the city: TERRA LINDA FARMS · 80 people · 2016
1/3 SYR4
Combined Uranium
1.937 µg/L 6.5%
of the EPA limit 30 µg/L
Highest in the city: LANARE COMMUNITY SERVICES DIST · 540 people · 2014
1/3 SYR4
Xylenes, Total
1.262 µg/L 0%
of the EPA limit 10000 µg/L
Highest in the city: LANARE COMMUNITY SERVICES DIST · 540 people · 2019
2/3 SYR4
Lead
0.0057 mg/L 38%
of the EPA limit 0.0150 mg/L
Main supplier: RIVERDALE PUBLIC UTILITY DISTRICT · 2,756 people · 2024
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 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 Riverdale

SupplierPopulation served
RIVERDALE PUBLIC UTILITY DISTRICT 2,756
LANARE COMMUNITY SERVICES DIST 540
TERRA LINDA FARMS 80

Frequently asked questions about Riverdale tap water

Is Riverdale tap water safe to drink?

EPA testing detected 22 contaminants in the water serving Riverdale. 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 Riverdale?

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

What contaminants are in Riverdale's water?

The contaminants EPA monitoring detected in Riverdale include Fluoride, Nitrate, TTHM, Copper, Total Haloacetic Acids (HAA5). 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.