CORONA is served by 1 water provider on file with the EPA.
Data current as of July 2026
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Results for CORONA, CA
1 water provider on file serving this city.
Quick answer: CORONA's water has no violation currently counted toward its compliance status. EPA's record shows a Nitrate violation dating to 03/28/1980 (46 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
Copper Summary
Lithium
PFHXA
PFPEA
PFBA
PFHXS
Aggressive Index
Temperature (CENTIGRADE)
Langelier Index (pH(s))
Langelier Index (Source Temp.)
Silica
Magnesium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Nitrate
pH, Field
pH
Manganese
Potassium
Sodium
Hardness, Total (ASCACO3)
Violations on file
Nitrate
Older/archived health-based violation
Found at 1 of 1 provider
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: 0.0037 mg/L (ppm)
12/31/2023
Copper Summary
Detected: 1.77 mg/L (ppm)
12/31/1992
Manganese
Detected: 21 UG/L (ppb)
10/15/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 10 MG/L (ppm)
10/28/2025
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: 0.46 MG/L (ppm)
10/8/2025
Calcium
Detected: 2.1 MG/L (ppm)
10/8/2025
Potassium
Detected: 0.71 MG/L (ppm)
10/8/2025
Sodium
Detected: 19 MG/L (ppm)
10/8/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: -1.7 LANG
10/8/2025
pH, Field
Detected: 7.08 PH
10/28/2025
pH
Detected: 7.9 PH
9/9/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Hardness, Total (ASCACO3)
Detected: 7.2 MG/L (ppm)
10/8/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 30.9 µg/L (ppb)
6/13/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFHXA
Detected: 0.0038 µg/L (ppb)
9/20/2023
PFPEA
Detected: 0.0036 µg/L (ppb)
6/13/2024
PFBA
Detected: 0.0076 µg/L (ppb)
12/14/2023
PFHXS
Detected: 0.0033 µg/L (ppb)
9/20/2023
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 18 MG/L (ppm)
10/8/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 9.6 AGGR
10/8/2025
Temperature (CENTIGRADE)
Detected: 72.5 C
10/28/2025
Langelier Index (Source Temp.)
Detected: -2.2 LANG
10/8/2025
Silica
Detected: 29 MG/L (ppm)
9/4/2025
Alkalinity, Total
Detected: 16 MG/L (ppm)
10/8/2025
TDS
Detected: 930 MG/L (ppm)
9/9/2025
Filtration considerations: General system types, not a specific product recommendation.