Water Quality Report · Updated May 12, 2026
CORONA, CITY OF
CORONA, CITY OF delivers tap water graded F (47/100) by TapWaterSafety.org. The utility serves approximately 168,575 residents in CORONA, California using surface water (purchased). The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Perfluoroheptane sulfonic acid (PFHpS) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Arsenic detected. For questions, the utility can be reached at 951-736-2265.
Is CORONA tap water safe to drink?
CORONA, CITY OF delivers tap water that earns a grade of F (47/100) from TapWaterSafety.org — a poor rating, with significant contamination concerns and/or recent violations.
The utility serves 168,575 residents in CORONA, drawing from surface water (purchased).
Public testing data identifies 25 contaminants in this water above EWG's health-based guidelines, including: Perfluorooctanoic acid (PFOA), Perfluorooctane sulfonate (PFOS), Perfluorohexane sulfonate (PFHXS), Perfluoroheptane sulfonic acid (PFHpS), Haloacetic acids (HAA5), Arsenic, Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Bromodichloromethane, Perfluorononanoic acid (PFNA), Dibromochloromethane, Dibromoacetic acid, Nitrate, Perfluorodecanoic acid (PFDA), Chromium (hexavalent), Uranium, Nitrate and nitrite, Trichloroacetic acid, Chloroform, Dichloroacetic acid, Bromoform, Perfluoropentane sulfonic acid (PFPeS), Perchlorate, 1,2,3-Trichloropropane, Tetrachloroethylene (perchloroethylene). For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for CORONA residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for CORONA, CITY OF.
PFAS contamination
Severe concernPerfluorononanoic acid (PFNA), Perfluorooctane sulfonate (PFOS) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 9.42 ppt, 9424x above the EWG health guideline of 0.001 ppt.
Perfluoroheptane sulfonic acid (PFHpS) significantly above health guideline
Moderate concernPerfluoroheptane sulfonic acid (PFHpS) detected at 0.662 ppt, 662x above the EWG health guideline of 0.001 ppt.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 36.2 ppb, 362x above the EWG health guideline of 0.1 ppb.
Arsenic detected
Moderate concernArsenic detected at 1.07 ppb.
Contact CORONA, CITY OF
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for CORONA
Filters matched to the specific contaminants in this water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 47/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) PFAS |
31.9 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | EPA violation |
| Perfluorooctane sulfonate (PFOS) PFAS |
31.0 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | EPA violation |
| Perfluorohexane sulfonate (PFHXS) PFAS |
9.42 ppt | 0.001 | 10.0 | — | — | — | — | 9424× over |
| Perfluoroheptane sulfonic acid (PFHpS) PFAS |
0.662 ppt | 0.001 | — | — | — | — | — | 662× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Arsenic Heavy metal |
1.07 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 268× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
10.2 ppb | 0.06 | — | — | — | — | — | 170× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
16.8 ppb | 0.15 | 80.0 | 100 | — | — | — | 112× over |
| Bromodichloromethane Disinfection byproduct |
4.49 ppb | 0.06 | — | — | — | — | — | 75× over |
| Perfluorononanoic acid (PFNA) PFAS |
0.443 ppt | 0.006 | 10.0 | — | — | — | — | 74× over |
| Dibromochloromethane Disinfection byproduct |
5.49 ppb | 0.1 | — | — | — | — | — | 55× over |
| Dibromoacetic acid Disinfection byproduct |
1.52 ppb | 0.03 | — | — | — | — | — | 51× over |
| Nitrate Inorganic |
5.54 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 40× over |
| Perfluorodecanoic acid (PFDA) PFAS |
0.179 ppt | 0.006 | — | — | — | — | — | 30× over |
| Chromium (hexavalent) Heavy metal |
0.574 ppb | 0.02 | — | — | — | — | — | 29× over |
| Uranium Radiological |
12.36 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 29× over |
| Nitrate and nitrite Inorganic |
2.36 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 17× over |
| Trichloroacetic acid Disinfection byproduct |
1.46 ppb | 0.1 | — | — | — | — | — | 15× over |
| Chloroform Disinfection byproduct |
4.53 ppb | 0.4 | — | — | — | — | — | 11× over |
| Dichloroacetic acid Disinfection byproduct |
2.03 ppb | 0.2 | — | — | — | — | — | 10× over |
| Bromoform Disinfection byproduct |
2.17 ppb | 0.5 | — | — | — | — | — | 4.3× over |
| Perfluoropentane sulfonic acid (PFPeS) PFAS |
2.92 ppt | 1.0 | — | — | — | — | — | 2.9× over |
| Perchlorate Disinfection byproduct |
2.04 ppb | 1.0 | — | — | — | — | — | 2.0× over |
| 1,2,3-Trichloropropane Other |
0.00132 ppb | 0.0007 | — | — | — | — | — | 1.9× over |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.08 ppb | 0.06 | 5.0 | — | — | — | — | 1.3× over |
| 1,2-Dibromo-3-chloropropane (DBCP) Other |
0.00137 ppb | 0.0017 | 0.2 | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
154.8 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Trichloroethylene Volatile organic compound |
0.275 ppb | 0.4 | 5.0 | 10 | 20 | 1.7 | — | Below guideline |
| Manganese Heavy metal |
41.7 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Aluminum Heavy metal |
118.7 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Vanadium Other |
3.62 ppb | 21.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0416 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Molybdenum Other |
3.57 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
52.2 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
12.5 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
8.98 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
7.87 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Dichloromethane (methylene chloride) Volatile organic compound |
0.02 ppb | 4.0 | 5.0 | — | — | — | — | Below guideline |
| N-ethyl perfluorooctane sulfonamido acetic acid (N-EtFOSAA) PFAS |
0.005 ppt | 1.0 | — | — | — | — | — | Below guideline |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) PFAS |
0.005 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
4.32 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
8.33 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Selenium Heavy metal |
0.093 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Strontium Radiological |
0.591 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.262 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
16.3 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
CORONA, CITY OF service area
This water system serves 1 community in Riverside County, California. Click any city for its dedicated tap water quality page.
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