Tap Water Safety Report for Corona, California
Corona, California tap water scored 76/100 (B) based on EPA data. While the water meets minimum EPA standards, 0 contaminant(s) are at elevated levels worth monitoring.
Overall Score
76/100
Grade: B
Contaminants Tested
8
All within limits
EPA Violations
1
All resolved
Water Source
surface
Surface water
Population Served
155,261
residents
Water Systems
1
serving this area
Based on Corona's water quality data, here are our specific recommendations:
With 0 contaminant(s) at elevated levels, a certified pitcher or faucet filter provides an affordable layer of protection. Look for NSF/ANSI certification.
City water reports reflect water leaving the treatment plant. Your home pipes may add contaminants, especially in older buildings. Test at the tap for the most accurate picture.
How contaminant levels compare to EPA limits (50% of overall score)
EPA violation history and enforcement actions (30% of overall score)
Water system infrastructure and source quality (20% of overall score)
Corona's water scored 76/100 with 0 contaminant(s) at elevated levels. Children are more vulnerable to water contaminants due to their lower body weight and developing systems. We recommend using a certified water filter for any water used for baby formula, cooking for children, or children's drinking water. A pitcher filter with NSF certification is an affordable first step.
Corona's water has been tested for 8 contaminants. None currently exceed EPA maximum contaminant levels. The most notable detections include: Total Trihalomethanes (28.8763 ug/L, EPA limit: 80 ug/L — 36% of limit); Mercury (0.0006 mg/L, EPA limit: 0.002 mg/L — 30% of limit); Nitrite (0.2772 mg/L, EPA limit: 1 mg/L — 28% of limit); Copper (0.1588 mg/L, EPA limit: 1.3 mg/L — 12% of limit); Haloacetic Acids (3.8538 ug/L, EPA limit: 60 ug/L — 6% of limit). The water system has no active EPA violations. Water quality can vary seasonally and by neighborhood, so home testing provides the most accurate picture for your specific tap.
Yes, we recommend filtering your water in Corona. With a score of 76/100 and 0 contaminant(s) at elevated levels, a certified water filter adds a meaningful layer of protection. A faucet-mounted or pitcher filter with NSF/ANSI 53 certification is a good starting point. For more thorough contaminant removal, consider an under-sink reverse osmosis system, especially if you have specific concerns about detected contaminants.
Corona's water quality score of 76/100 (B) is 4 points above the national average of 72. The city's water comes from surface water sources like rivers and reservoirs. While the water meets minimum federal standards, there is room for improvement compared to top-performing cities. You can see how Corona compares to nearby cities in our state rankings.
Detailed contaminant data, violation history, and water system information for Corona.
Find the best water filter for Corona based on detected contaminants and your budget.
See how Corona compares to other cities across California.
See how Corona ranks among all cities in the US for water quality.
Data Disclaimer
This report is based on publicly available EPA data and water quality test results. Water quality can vary by neighborhood, building age, and season. This information is for educational purposes and should not replace professional water testing. If you have specific health concerns about your water, contact your local water utility or a certified water testing laboratory. Last data update: February 2, 2026.