Tap Water Quality Report
Tap water quality in CORONA, California
Tap water in CORONA, California receives a grade of F (42/100) from TapWaterSafety.org. It's served by CORONA, CITY OF. 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. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in CORONA's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving CORONA.
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.
EPA compliance record
Official U.S. EPA records for CORONA, CITY OF (system ID CA3310037) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Inorganic Chemicals | Missed testing or reporting | 01/01/2017 | Open |
| Volatile Organic Chemicals | Missed testing or reporting | 01/01/2017 | Open |
| Nitrate Rule | Missed testing or reporting | 01/01/2017 | Open |
| Arsenic Rule | Missed testing or reporting | 01/01/2017 | Open |
| Synthetic Organic Chemicals | Missed testing or reporting | 01/01/2017 | Open |
| Radionuclides and Revised Rad Rule | Missed testing or reporting | 01/01/2017 | Open |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for CORONA
Filters matched to the specific contaminants in CORONA's water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in CORONA's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. 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, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from CORONA, CITY OF.