Serving roughly 157,566 people in Santa Clara County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for CITY OF SUNNYVALE
1 water provider directly on file, serving roughly 157,566 people in Santa Clara County, California.
Quick answer: CITY OF SUNNYVALE has no violations on file. One reading is worth knowing about: Chromium, Hex was measured at 2.9UG/L, among the highest of the 320 providers on file in this area. It's the most notable figure in this system's record among its 320 local peers.
Lead Summary
Nitrate
Chromium, Hex
Totalhaloaceticacids (HAA5)
TTHM
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Monobromoaceticacid
Monochloroaceticacid
Copper, Free
Utility CITY OF SUNNYVALEPopulation served 157,566Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Chromium, Hex
Detected: 2.9 UG/L (ppb)
9/3/2025
Copper, Free
Detected: 138 UG/L (ppb)
8/25/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 16 UG/L (ppb)
8/20/2025
TTHM
Detected: 45.5 UG/L (ppb)
8/20/2025
A group of disinfection byproducts formed when chlorine reacts with organic matter. Long-term exposure above the legal limit has been linked to increased cancer risk in some studies.
Chloroform
Detected: 7.92 UG/L (ppb)
8/20/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 5.51 UG/L (ppb)
8/20/2025
Bromodichloromethane
Detected: 14.9 UG/L (ppb)
8/20/2025
Dibromochloromethane
Detected: 17.1 UG/L (ppb)
8/20/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 2.3 MG/L (ppm)
3/4/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 5.4 UG/L (ppb)
8/20/2025
Trichloroaceticacid
Detected: 3.2 UG/L (ppb)
8/20/2025
Dibromoaceticacid
Detected: 7.5 UG/L (ppb)
8/20/2025
Monobromoaceticacid
Detected: 1.1 UG/L (ppb)
8/20/2025
Monochloroaceticacid
Detected: 2.4 UG/L (ppb)
8/20/2025
Filtration considerations: See the table below for how whole-house carbon, under-sink reverse osmosis, and under-sink carbon systems compare against what's actually on file here. These are general system types, not a specific product recommendation.