Serving roughly 54,453 people in San Bernardino County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for RIALTO, CITY OF
1 water provider directly on file, serving roughly 54,453 people in San Bernardino County, California.
Quick answer: RIALTO, CITY OF has no violations on file. One reading is worth knowing about: PFHXA was measured at 0.017µg/L, among the highest of the 669 providers on file in this area. It's the most notable figure in this system's record among its 669 local peers.
Lead Summary
PFHXA
PFOA
PFBS
PFHPA
PFHXS
PFPEA
PFBA
Chloride
Sulfate
Nitrate
Perchlorate
Trichloroethylene
1, 1-Dichloroethane
1, 2-Dichloropropane
Tetrachloroethylene
Chloroform
Conductivity (at 25°C)
Alkalinity, Total
Utility RIALTO, CITY OFPopulation served 54,453Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2024
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Chloroform
Detected: 0.62 UG/L (ppb)
10/8/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 5.6 MG/L (ppm)
10/30/2025
Sulfate
Detected: 17 MG/L (ppm)
10/30/2025
Nitrate
Detected: 8.3 MG/L (ppm)
1/7/2025
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
PFHXA
Detected: 0.017 µg/L (ppb)
1/4/2024
PFOA
Detected: 0.0073 µg/L (ppb)
7/19/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFBS
Detected: 0.0039 µg/L (ppb)
1/4/2024
PFHPA
Detected: 0.0035 µg/L (ppb)
7/19/2023
PFHXS
Detected: 0.0034 µg/L (ppb)
1/4/2024
PFPEA
Detected: 0.018 µg/L (ppb)
1/4/2024
PFBA
Detected: 0.0057 µg/L (ppb)
1/4/2024
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Trichloroethylene
Detected: 0.54 UG/L (ppb)
10/8/2025
1, 1-Dichloroethane
Detected: 0.5 UG/L (ppb)
10/8/2025
1, 2-Dichloropropane
Detected: 3.4 UG/L (ppb)
10/8/2025
Tetrachloroethylene
Detected: 0.6 UG/L (ppb)
10/8/2025
Other
Additional substances tested that don't fit neatly into the categories above
Perchlorate
Detected: 2 UG/L (ppb)
10/8/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Conductivity (at 25°C)
Detected: 370 UMHO/CM
1/14/2025
Alkalinity, Total
Detected: 140 MG/L (ppm)
10/26/2025
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.