SAN BERNARDIN0 is served by 3 water providers on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for SAN BERNARDIN0, CA
3 water providers on file serving this city.
Quick answer: SAN BERNARDIN0's water has no violations on file and no single reading stands out against its peers (3 other providers in this area). It serves roughly 214,665 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Lithium
PFBS
PFHXS
PFHXA
PFPEA
Magnesium
Sodium
Calcium
Sulfate
Chloride
Hardness, Total (ASCACO3)
TDS
Nitrate
Copper, Free
Chromium
Arsenic
Selenium
Copper Summary
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
Found at 3 providers
Copper, Free
Detected: 860 UG/L (ppb)
Found at 2 providers
Chromium
Detected: 8.4 UG/L (ppb)
Found at 2 providers
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Arsenic
Detected: 13 UG/L (ppb)
Found at 2 providers
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Selenium
Detected: 3.3 UG/L (ppb)
Found at 2 providers
Copper Summary
Detected: 1.5 mg/L (ppm)
12/31/2024
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 37 MG/L (ppm)
8/12/2025
Chloride
Detected: 28 MG/L (ppm)
8/12/2025
Nitrate
Detected: 4.9 MG/L (ppm)
Found at 3 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 8.6 MG/L (ppm)
8/12/2025
Sodium
Detected: 34 MG/L (ppm)
8/12/2025
Calcium
Detected: 53 MG/L (ppm)
8/12/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 170 MG/L (ppm)
8/12/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 9.11 µg/L (ppb)
4/18/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFBS
Detected: 0.0044 µg/L (ppb)
10/17/2024
PFHXS
Detected: 0.004 µg/L (ppb)
10/17/2024
PFHXA
Detected: 0.004 µg/L (ppb)
10/17/2024
PFPEA
Detected: 0.0034 µg/L (ppb)
10/17/2024
Other
Additional substances tested that don't fit neatly into the categories above
TDS
Detected: 280 MG/L (ppm)
Found at 3 providers
Filtration considerations: General system types, not a specific product recommendation.