SAN MARINO is served by 1 water provider on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for SAN MARINO, CA
1 water provider on file serving this city.
Quick answer: SAN MARINO's water has no violations on file and no single reading stands out against its peers (1 other providers in this area). It serves roughly 47,995 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Lithium
PFBA
TTHM
Chloroform
Dibromochloromethane
Bromoform
Bromodichloromethane
Dichloroaceticacid
Dibromoaceticacid
Trichloroaceticacid
Nitrate
Fluoride
Combined Uranium
1, 2, 3-Trichloropropane
Chromium, Hex
Trichloroethylene
Tetrachloroethylene
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2023
Combined Uranium
Detected: 2.1 PCI/L
5/20/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Chromium, Hex
Detected: 8.6 UG/L (ppb)
8/26/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 28 UG/L (ppb)
8/22/2025
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: 8.7 UG/L (ppb)
8/22/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Dibromochloromethane
Detected: 8.7 UG/L (ppb)
8/22/2025
Bromoform
Detected: 2.9 UG/L (ppb)
8/22/2025
Bromodichloromethane
Detected: 9.2 UG/L (ppb)
8/22/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 3.19 MG/L (ppm)
10/27/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Fluoride
Detected: 0.92 MG/L (ppm)
5/20/2025
Often added deliberately for dental health; can also occur naturally.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 91.9 µg/L (ppb)
2/7/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFBA
Detected: 0.0053 µg/L (ppb)
2/7/2024
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
1, 2, 3-Trichloropropane
Detected: 0.0074 UG/L (ppb)
8/6/2025
Trichloroethylene
Detected: 3.6 UG/L (ppb)
8/26/2025
Tetrachloroethylene
Detected: 1.8 UG/L (ppb)
8/26/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 2.1 UG/L (ppb)
8/22/2025
Dibromoaceticacid
Detected: 1.3 UG/L (ppb)
5/23/2025
Trichloroaceticacid
Detected: 3.3 UG/L (ppb)
8/22/2025
Filtration considerations: General system types, not a specific product recommendation.