COLUSA is served by 2 water providers on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for COLUSA, CA
2 water providers on file serving this city.
Quick answer: COLUSA's water has no violations on file and no single reading stands out against its peers (2 other providers in this area). It serves roughly 6,447 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Lithium
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Odor
Iron
Manganese
Chromium, Hex
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0068 mg/L (ppm)
12/31/2024
Iron
Detected: 59.7 UG/L (ppb)
10/15/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 60.7 UG/L (ppb)
10/15/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Chromium, Hex
Detected: 0.17 UG/L (ppb)
1/15/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 12 UG/L (ppb)
1/15/2025
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: 1.3 UG/L (ppb)
1/15/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 4.6 UG/L (ppb)
1/15/2025
Bromodichloromethane
Detected: 2.5 UG/L (ppb)
1/15/2025
Dibromochloromethane
Detected: 4.1 UG/L (ppb)
1/15/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 41.9 µg/L (ppb)
5/6/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Other
Additional substances tested that don't fit neatly into the categories above
Odor
Detected: 7 TON
9/4/2025
Filtration considerations: General system types, not a specific product recommendation.