Is Sunnyvale, CA Tap Water Safe? Quality & Contaminants

What was found in Sunnyvale'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.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	6300 µg/L 63% of the EPA limit 10000 µg/L Main supplier: CITY OF SUNNYVALE · 157,566 people · 2019	1/1	SYR4
Fluoride	212.99999999999994 µg/L 5.3% of the EPA limit 4000 µg/L Main supplier: CITY OF SUNNYVALE · 157,566 people · 2018	1/1	SYR4
Barium	130 µg/L 6.5% of the EPA limit 2000 µg/L Main supplier: CITY OF SUNNYVALE · 157,566 people · 2018	1/1	SYR4
TTHM	60.37 µg/L 75% of the EPA limit 80 µg/L Main supplier: CITY OF SUNNYVALE · 157,566 people · 2019	1/1	SYR4
Chloroform	46.925 µg/L No EPA limit set Main supplier: CITY OF SUNNYVALE · 157,566 people · 2019	1/1	SYR4
Total Haloacetic Acids (HAA5)	42.44999999999999 µg/L 71% of the EPA limit 60 µg/L Main supplier: CITY OF SUNNYVALE · 157,566 people · 2019	1/1	SYR4
Dibromochloromethane	26.335 µg/L No EPA limit set Main supplier: CITY OF SUNNYVALE · 157,566 people · 2019	1/1	SYR4
Dichloroacetic Acid	22 µg/L No EPA limit set Main supplier: CITY OF SUNNYVALE · 157,566 people · 2019	1/1	SYR4
Bromoform	20.259999999999998 µg/L No EPA limit set Main supplier: CITY OF SUNNYVALE · 157,566 people · 2019	1/1	SYR4
Trichloroacetic Acid	19 µg/L No EPA limit set Main supplier: CITY OF SUNNYVALE · 157,566 people · 2019	1/1	SYR4
Bromodichloromethane	18.479999999999997 µg/L No EPA limit set Main supplier: CITY OF SUNNYVALE · 157,566 people · 2019	1/1	SYR4
Dibromoacetic Acid	12 µg/L No EPA limit set Main supplier: CITY OF SUNNYVALE · 157,566 people · 2019	1/1	SYR4
Monochloroacetic Acid	4.879999999999999 µg/L No EPA limit set Main supplier: CITY OF SUNNYVALE · 157,566 people · 2019	1/1	SYR4
Monobromoacetic Acid	2.075 µg/L No EPA limit set Main supplier: CITY OF SUNNYVALE · 157,566 people · 2019	1/1	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CITY OF SUNNYVALE · 157,566 people · 2025	1/1	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 Sunnyvale

Supplier	Population served
CITY OF SUNNYVALE	157,566

Frequently asked questions about Sunnyvale tap water

Is Sunnyvale tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Sunnyvale. 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 Sunnyvale?

1 public water supplier report drinking-water monitoring for Sunnyvale, California to the EPA. Each is listed above with its population served.

What contaminants are in Sunnyvale's water?

The contaminants EPA monitoring detected in Sunnyvale include Nitrate, Fluoride, Barium, TTHM, Chloroform. 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.