D38/100
Corona Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 173,952 residents · California
What's In Corona's Tap Water?
77
Contaminants Tested
1
Exceed EPA Limits
2
Above EPA Goals
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.77 mg/L | 1.30 mg/L | Over Limit |
chlorate | 360.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: April 1, 2022 – June 30, 2022Rule: Stage 2 DBPREnforcement: Formal — state order issued
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: April 1, 2022 – June 30, 2022Rule: Stage 2 DBPREnforcement: Formal — state order issued
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
GLEN IVY HOT SPRINGS
Population Served
1,087
Water Source
Groundwater
System ID
CA3301294
HOME GARDENS COUNTY WD
Population Served
3,095
Water Source
Purchased Surface Water
System ID
CA3310018
CORONA, CITY OF
Population Served
168,575
Water Source
Purchased Surface Water
System ID
CA3310037
CALIFORNIA INSTITUTION FOR WOMEN
Population Served
1,195
Water Source
Purchased Groundwater
System ID
CA3610851
Frequently Asked Questions About Corona Water
Is Corona tap water safe to drink?
Corona, California tap water receives a grade of D (38/100), which is considered poor. 1 contaminant(s) exceed EPA maximum contaminant levels and 127 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Corona's water?
Of the 77 contaminants tested in Corona's water supply, the most notable include Copper (90th percentile), Lead (90th percentile), chlorate. 1 contaminant(s) exceed EPA legal limits (MCLs). 3 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Corona have any water quality violations?
Yes, Corona has 127 EPA violation(s) on record, with the most recent in 2024. Violation types include RPT, TT, MR. 78 of these are health-based violations, which are the most serious category.
Do I need a water filter in Corona?
Based on EPA data, using a water filter in Corona is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Corona's tap water come from?
Corona's drinking water is sourced from groundwater and supplied by GLEN IVY HOT SPRINGS and 3 other water system(s). The system serves approximately 173,952 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Corona's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Corona's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Corona's water compare to other cities in California?
Corona's water quality score of 38/100 earns a grade of D, which is considered poor. This is a concerning score that suggests significant water quality issues. Visit our California state page to see how all cities in the state compare.
What should I do if I'm concerned about Corona's water quality?
If you have concerns about Corona's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (GLEN IVY HOT SPRINGS) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.