Serving roughly 59,203 people in Santa Clara County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for CITY OF GILROY
1 water provider directly on file, serving roughly 59,203 people in Santa Clara County, California.
Quick answer: CITY OF GILROY has no violations on file. One reading is worth knowing about: Perfluorobutanesulfonicacid (PFBS) was measured at 5.3NG/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
PFPEA
PFHXA
PFBS
PFHPA
PFHXS
PFOS
PFOA
Lithium
Totalhaloaceticacids (HAA5)
TTHM
Bromoform
Dibromochloromethane
Bromodichloromethane
Dibromoaceticacid
Nitrate
Perfluorobutanesulfonicacid (PFBS)
Perfluoroctanoicacid (PFOA)
Perfluorohexanoicacid (PFHXA)
Perfluoropentanoicacid (PFPEA)
Perfluoroheptanoicacid (PFHPA)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluorobutanoicacid (PFBA)
Radium-228
Combined Radium (-226 & -228)
Chromium, Hex
Tetrachloroethylene
Perchlorate
Utility CITY OF GILROYPopulation served 59,203Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.002 mg/L (ppm)
12/31/2024
Chromium, Hex
Detected: 0.54 UG/L (ppb)
1/21/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 1.9 UG/L (ppb)
7/21/2025
TTHM
Detected: 7.79 UG/L (ppb)
7/21/2025
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.
Bromoform
Detected: 4.68 UG/L (ppb)
7/21/2025
Dibromochloromethane
Detected: 3.11 UG/L (ppb)
7/21/2025
Bromodichloromethane
Detected: 1 UG/L (ppb)
4/23/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 4.6 MG/L (ppm)
7/21/2025
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
PFPEA
Detected: 0.0045 µg/L (ppb)
6/25/2025
PFHXA
Detected: 0.0036 µg/L (ppb)
6/25/2025
PFBS
Detected: 0.004 µg/L (ppb)
6/25/2025
PFHPA
Detected: 0.0036 µg/L (ppb)
12/17/2024
PFHXS
Detected: 0.0035 µg/L (ppb)
12/17/2024
PFOS
Detected: 0.0058 µg/L (ppb)
12/17/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFOA
Detected: 0.0055 µg/L (ppb)
6/25/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Lithium
Detected: 11 µg/L (ppb)
6/25/2025
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Tetrachloroethylene
Detected: 0.85 UG/L (ppb)
9/29/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dibromoaceticacid
Detected: 1.9 UG/L (ppb)
7/21/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 5.3 NG/L (ppt)
10/22/2025
Perfluoroctanoicacid (PFOA)
Detected: 5.2 NG/L (ppt)
10/22/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 3.9 NG/L (ppt)
10/22/2025
Perfluoropentanoicacid (PFPEA)
Detected: 4 NG/L (ppt)
10/22/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 3.2 NG/L (ppt)
3/24/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 2.3 NG/L (ppt)
3/24/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 6.8 NG/L (ppt)
3/24/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorobutanoicacid (PFBA)
Detected: 4.5 NG/L (ppt)
3/24/2025
Radium-228
Detected: 0.828 PCI/L
9/3/2025
Combined Radium (-226 & -228)
Detected: 0.828 PCI/L
9/3/2025
A naturally occurring radioactive element found in some groundwater.
Perchlorate
Detected: 2.6 UG/L (ppb)
7/21/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
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.