Water Quality in Corona, CA: 51 Violations - Grade N/A
11 water systems · 5 directly mapped ZIP records
Available EPA records report 51 violations across 5 directly mapped ZIP records with known counts for Corona. This is compliance evidence, not a property-level tap-water verdict.
Data: EPA Safe Drinking Water Information System (SDWIS)
Water Quality by ZIP Code in Corona
This table shows typed EPA water evidence only. Missing violation counts are displayed as N/A, not zero.
| ZIP Code | Violations | Health | |
|---|---|---|---|
| 92880 | 46 | 1 | View report → |
| 92883 | 7 | 0 | View report → |
| 92881 | 3 | 0 | View report → |
| 92879 | 2 | 0 | View report → |
| 92882 | 2 | 0 | View report → |
Water Quality Overview
Corona, California has directly mapped EPA water-system data for 5 ZIP codes. This page reports typed compliance facts and does not relabel the multi-source Home Safety Score as a drinking-water grade.
The available EPA records report 51 violations, including 1 health-based violation across 5 directly mapped ZIP records with reported counts.
Lead Levels
The average 90th percentile lead level across Corona water systems is 0.0037 mg/L - within EPA limits. No exceedances appear among the 5 ZIP records with known lead status.
Water Systems Serving Corona
Corona is served by 11 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 262,651 people across 7 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 24 enforcement actions against water systems serving Corona. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Corona
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels and violation history
Request your CCR - your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test - certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration - NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories - monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Corona Water Systems
The following contaminants have been detected or caused violations across Corona's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 8 | 5 | Yes |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 7 | 5 | No |
| Stage 1 DBP Rule | Treatment Technique | N/A | 3 | 3 | No |
| Barium | Inorganic | 2 mg/L | 1 | 1 | No |
| Cadmium | Inorganic | 0.005 mg/L | 1 | 1 | No |
| Chromium | Inorganic | 0.1 mg/L | 1 | 1 | No |
| Fluoride | Inorganic | 4 mg/L | 1 | 1 | No |
| Nickel | Inorganic | 0.1 mg/L | 1 | 1 | No |
| Nitrite | Inorganic | 1 mg/L | 1 | 1 | No |
| Copper | Inorganic | 1.3 mg/L | 1 | 1 | No |
| Mercury | Inorganic | 0.002 mg/L | 1 | 1 | No |
| Atrazine | Organic | 0.003 mg/L | 1 | 1 | No |
| Benzene | Organic | 0.005 mg/L | 1 | 1 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
EPA Enforcement History
The EPA and state regulators have taken 11 enforcement actions against water systems serving Corona. Recent actions:
| Date | Action Type |
|---|---|
| 2026-03-02 | State Filed Judgment |
| 2025-10-07 | State Filed Suit |
| 2025-09-02 | State Filed Suit |
| 2025-08-07 | State Order Extension |
| 2023-11-08 | State Filed Suit |
| 2023-02-20 | State Order Extension |
| 2023-02-13 | State Filed Suit |
| 2022-10-17 | State Filed Suit |
| 2022-09-15 | State Order Extension |
| 2022-09-03 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2026-03-02.
Corona vs. Nearby California Cities
How Corona's water quality compares to similar cities in California:
| City | Direct EPA ZIPs | Violations | Systems | Population |
|---|---|---|---|---|
| Corona | 5 | 51 | 11 | 262,651 |
| Modesto | 7 | 5 | 10 | 268,575 |
| San Bernardino | 8 | 24 | 12 | 255,071 |
| Chula Vista | 5 | 1 | 3 | 272,064 |
Recommended Water Filters for Corona
Based on contaminants detected in Corona's water supply, these filter types are recommended:
Reverse Osmosis (under-sink)
- Removes: Gross Alpha Particle Activity, Uranium, Arsenic, Nitrate (as Nitrogen)
- Effectiveness: 85-99%
- Cost range: $150–$600
- Certification: NSF/ANSI 58
- Recommended products:
- Waterdrop G3P800
- iSpring RCC7AK
- Crystal Quest Arsenic Filter
Water Quality by ZIP Code in Corona
EPA coverage and recorded violations can differ across Corona's ZIP codes. Missing counts are shown as unavailable, not zero:
Common Questions About Corona Water
These are the most common questions residents search for about water quality in Corona, California:
Is Corona water hard or soft? Water hardness varies by source. Corona's 11 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Corona tap water? City-level EPA records cannot determine safety at a specific tap. The measured subset contains 1 health-based violation; check the affected utility record and consider certified testing.
What is the best water filter for Corona? Based on detected contaminants, a reverse osmosis (under-sink) filter is most recommended. See our Water Filter Matcher for personalized recommendations.
Corona vs. California Average
Understanding how Corona compares to the broader California average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below - water quality can vary significantly even within Corona.
ZIP Codes in Corona
Corona spans 7 ZIP codes. EPA water-system coverage is available for 5 directly mapped ZIP codes. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Source reporting periods vary. See each cited source for its publication schedule.