Serving roughly 76,689 people in Alameda County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for CITY OF PLEASANTON
1 water provider directly on file, serving roughly 76,689 people in Alameda County, California.
Quick answer: CITY OF PLEASANTON has no violations on file and no single reading stands out against its peers (50 other providers in this area). It serves roughly 76,689 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Copper Summary
Lithium
PFHXS
PFOS
Pfpes
PFBA
PFHXA
PFOA
PFBS
PFPEA
Totalhaloaceticacids (HAA5)
TTHM
Lead
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Monobromoaceticacid
Dibromoaceticacid
Copper, Free
Nitrate
Radium-228
Chromium, Hex
Utility CITY OF PLEASANTONPopulation served 76,689Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Copper Summary
Detected: 1.7 mg/L (ppm)
06/30/1992
Lead
Detected: 5.5 UG/L (ppb)
9/13/2025
A metal that can leach from old pipes, solder, and fixtures. Current medical guidance holds there is no truly safe level of lead exposure, especially for children and pregnant women.
Copper, Free
Detected: 75 UG/L (ppb)
9/19/2025
Chromium, Hex
Detected: 1.7 UG/L (ppb)
6/10/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 25.9 UG/L (ppb)
9/18/2025
TTHM
Detected: 67.43 UG/L (ppb)
9/18/2025
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: 2.8 UG/L (ppb)
9/18/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 31.45 UG/L (ppb)
9/18/2025
Bromodichloromethane
Detected: 7.47 UG/L (ppb)
9/18/2025
Dibromochloromethane
Detected: 25.71 UG/L (ppb)
9/18/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 2.1 MG/L (ppm)
9/24/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 9.62 µg/L (ppb)
5/15/2025
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFHXS
Detected: 0.018 µg/L (ppb)
2/5/2025
PFOS
Detected: 0.026 µg/L (ppb)
2/5/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Pfpes
Detected: 0.0043 µg/L (ppb)
8/20/2024
PFBA
Detected: 0.006 µg/L (ppb)
2/5/2025
PFHXA
Detected: 0.0036 µg/L (ppb)
2/5/2025
PFOA
Detected: 0.0042 µg/L (ppb)
2/5/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFBS
Detected: 0.0061 µg/L (ppb)
2/5/2025
PFPEA
Detected: 0.0032 µg/L (ppb)
2/5/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 11.9 UG/L (ppb)
9/18/2025
Trichloroaceticacid
Detected: 2.8 UG/L (ppb)
9/18/2025
Monobromoaceticacid
Detected: 1.5 UG/L (ppb)
9/18/2025
Dibromoaceticacid
Detected: 9.7 UG/L (ppb)
9/18/2025
Radium-228
Detected: 0.958 PCI/L
8/12/2025
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.