Serving roughly 29,519 people in San Mateo County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for CITY OF EAST PALO ALTO
1 water provider directly on file, serving roughly 29,519 people in San Mateo County, California.
Quick answer: CITY OF EAST PALO ALTO has no violations on file. One reading is worth knowing about: Chloride was measured at 310MG/L, among the highest of the 113 providers on file in this area. It's the most notable figure in this system's record among its 113 local peers.
Lead Summary
TDS
Chloride
Iron
Manganese
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Utility CITY OF EAST PALO ALTOPopulation served 29,519Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2023
Iron
Detected: 250 UG/L (ppb)
10/6/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 160 UG/L (ppb)
10/6/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 50.2 UG/L (ppb)
10/7/2025
TTHM
Detected: 58.74 UG/L (ppb)
10/7/2025
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: 57.72 UG/L (ppb)
10/7/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 1.02 UG/L (ppb)
10/7/2025
Dibromochloromethane
Detected: 1.32 UG/L (ppb)
1/13/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 310 MG/L (ppm)
10/6/2025
Other
Additional substances tested that don't fit neatly into the categories above
TDS
Detected: 780 MG/L (ppm)
10/6/2025
Dichloroaceticacid
Detected: 27.9 UG/L (ppb)
10/7/2025
Trichloroaceticacid
Detected: 22.3 UG/L (ppb)
10/7/2025
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.