Serving roughly 7,269 people in Butte County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for CITY OF GRIDLEY
1 water provider directly on file, serving roughly 7,269 people in Butte County, California.
Quick answer: CITY OF GRIDLEY currently has an open health-based violation on file: Lead And Copper Rule Revisions, a compliance issue since 10/17/2024. This is active, not historical — see the violation detail below for what EPA's enforcement record shows.
Lead Summary
PFPEA
PFOS
PFHXA
PFNA
PFHXS
PFHPA
Dibromochloromethane
Nitrate
Radium-228
Chromium, Hex
Arsenic
Utility CITY OF GRIDLEYPopulation served 7,269Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2023
Chromium, Hex
Detected: 11.1 UG/L (ppb)
10/8/2025
Arsenic
Detected: 8 UG/L (ppb)
10/8/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Dibromochloromethane
Detected: 1 UG/L (ppb)
8/13/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 1.7 MG/L (ppm)
4/9/2025
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: 0.0062 µg/L (ppb)
12/2/2024
PFOS
Detected: 0.009 µg/L (ppb)
12/2/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXA
Detected: 0.0052 µg/L (ppb)
12/2/2024
PFNA
Detected: 0.0096 µg/L (ppb)
12/2/2024
PFHXS
Detected: 0.0123 µg/L (ppb)
12/2/2024
PFHPA
Detected: 0.0032 µg/L (ppb)
12/2/2024
Other
Additional substances tested that don't fit neatly into the categories above
Radium-228
Detected: 0.764 PCI/L
5/14/2025
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.