Water Quality in Edison, CA: 15 Violations - Grade F
Grade F · Score 39/100 · 3 water systems · Updated 2026-07-18
Edison's water has serious compliance issues. Independent testing and filtration are strongly recommended.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-07-18
Federal EPA data for Edison, CA shows 15 water compliance events in the record - the table below identifies system names and violation types.
Water Quality by ZIP Code in Edison
Edison is covered by a single ZIP code, so one water-quality profile applies citywide. See the contaminant data below.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 93220 | F | 39 | 15 | 14 | View report → |
Violation Trend
EPA violations recorded for water systems serving Edison.
Water Quality Overview
Edison, California receives a water quality grade of F with an overall score of 39 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 3 water systems serving Edison have accumulated 15 EPA violations, including 14 health-based violations. These violations are tracked across 1 ZIP code serving approximately 300,836 people.
What Grade F Means
A grade of F indicates serious compliance issues. Edison's water systems have substantial violations. Residents should strongly consider independent water testing and appropriate filtration.
Lead Levels
Lead testing data for Edison is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
Radon Risk
Edison is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Edison
Edison is served by 3 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 300,836 people across 1 ZIP code.
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 2 enforcement actions against water systems serving Edison. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Edison
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
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 Edison Water Systems
The following contaminants have been detected or caused violations across Edison's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Lead | Inorganic | 0.015 mg/L | 13 | 1 | Yes |
| Stage 2 DBP Rule | Treatment Technique | N/A | 2 | 1 | Yes |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Edison:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2022 | 4 | 4 |
| 2023 | 3 | 3 |
| 2024 | 4 | 4 |
| 2025 | 4 | 4 |
Violation counts have remained stable over the observed period.
EPA Enforcement History
The EPA and state regulators have taken 2 enforcement actions against water systems serving Edison. Recent actions:
| Date | Action Type |
|---|---|
| 2025-03-19 | State Order Extension |
| 2024-08-27 | State Filed Suit |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-03-19.
Edison vs. Nearby California Cities
How Edison's water quality compares to similar cities in California:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Edison | F | 15 | 3 | 300,836 |
| Irvine | A | 84 | 8 | 308,406 |
| Chula Vista | A | 0 | 4 | 272,064 |
| Modesto | A | 0 | 8 | 268,575 |
Common Questions About Edison Water
These are the most common questions residents search for about water quality in Edison, California:
Is Edison water hard or soft? Water hardness varies by source. Edison's 3 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Edison tap water? Edison's water receives a grade of F (39/100). There are 14 health-based violations - consider filtration.
What is the best water filter for Edison? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Edison vs. California Average
Understanding how Edison 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 Edison.
ZIP Codes in Edison
Edison spans 1 ZIP code. The ZIP with the lowest water quality score is 93220. Each ZIP code has its own water quality profile based on the specific water system serving that area. 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
Updated daily.