Serving roughly 298,398 people in Riverside County, California.
Data current as of July 2026
🔍Straight from EPA
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Results for RIVERSIDE, CITY OF
1 water provider directly on file, serving roughly 298,398 people in Riverside County, California.
Quick answer: RIVERSIDE, CITY OF has no violation currently counted toward its compliance status. EPA's record shows a Nitrate violation dating to 06/01/1981 (45 years ago) — because it's more than five years past its deadline, EPA's policy no longer treats it as part of this system's current standing, though it remains on the public record.
Lead Summary
PFHXA
PFPEA
Lithium
PFOS
Nitrate
Perfluorobutanesulfonicacid (PFBS)
Perfluoroheptanoicacid (PFHPA)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorodecanoicacid (PFDA)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Chromium, Hex
Perchlorate
Arsenic
Temperature (CENTIGRADE)
Langelier Index (Source Temp.)
Magnesium
Potassium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Sulfate
Chloride
Silica
Foamingagents (SURFACTANTS)
Fluoride
Utility RIVERSIDE, CITY OFPopulation served 298,398Owner Local government
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.001 mg/L (ppm)
12/31/2025
Chromium, Hex
Detected: 1.5 UG/L (ppb)
7/10/2025
Arsenic
Detected: 5.5 UG/L (ppb)
7/10/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 1.2 MG/L (ppm)
7/10/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Sulfate
Detected: 88 MG/L (ppm)
10/2/2025
Chloride
Detected: 72 MG/L (ppm)
10/2/2025
Fluoride
Detected: 0.44 MG/L (ppm)
10/2/2025
Often added deliberately for dental health; can also occur naturally.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 18 MG/L (ppm)
10/2/2025
Potassium
Detected: 4.4 MG/L (ppm)
10/2/2025
Sodium
Detected: 62 MG/L (ppm)
10/2/2025
Calcium
Detected: 110 MG/L (ppm)
10/2/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 340 MG/L (ppm)
10/2/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFHXA
Detected: 0.0032 µg/L (ppb)
8/10/2023
PFPEA
Detected: 0.0033 µg/L (ppb)
11/20/2023
Lithium
Detected: 9.1 µg/L (ppb)
11/20/2023
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFOS
Detected: 0.004 µg/L (ppb)
8/10/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 230 MG/L (ppm)
10/2/2025
Other
Additional substances tested that don't fit neatly into the categories above
Perfluorobutanesulfonicacid (PFBS)
Detected: 3.9 NG/L (ppt)
8/14/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 2.1 NG/L (ppt)
8/14/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 3.1 NG/L (ppt)
8/14/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 11 NG/L (ppt)
8/14/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 4.9 NG/L (ppt)
8/14/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorodecanoicacid (PFDA)
Detected: 2.8 NG/L (ppt)
8/14/2025
Perfluorohexanoicacid (PFHXA)
Detected: 5.1 NG/L (ppt)
8/14/2025
Perfluorobutanoicacid (PFBA)
Detected: 5.1 NG/L (ppt)
8/14/2025
Perfluoropentanoicacid (PFPEA)
Detected: 6.4 NG/L (ppt)
8/14/2025
Perchlorate
Detected: 1.7 UG/L (ppb)
8/14/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Temperature (CENTIGRADE)
Detected: 25 C
7/16/2025
Langelier Index (Source Temp.)
Detected: 0.8 LANG
7/16/2025
Alkalinity, Total
Detected: 230 MG/L (ppm)
10/2/2025
TDS
Detected: 570 MG/L (ppm)
10/2/2025
Silica
Detected: 25 MG/L (ppm)
7/16/2025
Foamingagents (SURFACTANTS)
Detected: 0.09 MG/L (ppm)
7/16/2025
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.