Water Quality in San Diego, CA: 1 Violation - Grade N/A
9 water systems · 40 directly mapped ZIP records
Available EPA records report 1 violations across 40 directly mapped ZIP records with known counts for San Diego. 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 San Diego
This table shows typed EPA water evidence only. Missing violation counts are displayed as N/A, not zero.
| ZIP Code | Violations | Health | |
|---|---|---|---|
| 92154 | 1 | 1 | View report → |
| 92155 | 1 | 1 | View report → |
| 92101 | 0 | 0 | View report → |
| 92102 | 0 | 0 | View report → |
| 92103 | 0 | 0 | View report → |
| 92104 | 0 | 0 | View report → |
| 92105 | 0 | 0 | View report → |
| 92106 | 0 | 0 | View report → |
| 92107 | 0 | 0 | View report → |
| 92108 | 0 | 0 | View report → |
| 92109 | 0 | 0 | View report → |
| 92110 | 0 | 0 | View report → |
| 92111 | 0 | 0 | View report → |
| 92113 | 0 | 0 | View report → |
| 92114 | 0 | 0 | View report → |
Water Quality Overview
San Diego, California has directly mapped EPA water-system data for 40 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 1 violation, including 1 health-based violation across 40 directly mapped ZIP records with reported counts.
Lead Levels
The average 90th percentile lead level across San Diego water systems is 0.0002 mg/L - within EPA limits. No exceedances appear among the 40 ZIP records with known lead status.
With 63% of homes built before 1986, San Diego has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Water Systems Serving San Diego
San Diego is served by 9 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 1,330,316 people across 81 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 8 enforcement actions against water systems serving San Diego. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in San Diego
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
EPA Enforcement History
The EPA and state regulators have taken 4 enforcement actions against water systems serving San Diego. Recent actions:
| Date | Action Type |
|---|---|
| 2024-01-26 | State Filed Judgment |
| 2023-12-18 | State Order Extension |
| 2023-10-16 | State Filed Suit |
| 2023-09-30 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2024-01-26.
San Diego vs. Nearby California Cities
How San Diego's water quality compares to similar cities in California:
| City | Direct EPA ZIPs | Violations | Systems | Population |
|---|---|---|---|---|
| San Diego | 40 | 1 | 9 | 1,330,316 |
| San Jose | 28 | 7 | 10 | 1,014,813 |
| Sacramento | 28 | 9 | 20 | 846,557 |
| San Francisco | 29 | 0 | 5 | 836,321 |
Recommended Water Filters for San Diego
Based on contaminants detected in San Diego's water supply, these filter types are recommended:
Reverse Osmosis (under-sink)
- Removes: Copper
- Effectiveness: 95-99%
- Cost range: $150–$500
- Certification: NSF/ANSI 58
- Recommended products:
Granular Activated Carbon (GAC, whole-house POE)
- Removes: Total Trihalomethanes (TTHM)
- Effectiveness: 80-99%
- Cost range: $400–$2000
- Certification: NSF/ANSI 53
- Recommended products:
Water Quality by ZIP Code in San Diego
EPA coverage and recorded violations can differ across San Diego's ZIP codes. Missing counts are shown as unavailable, not zero:
| ZIP Code | Violations | Health-Based |
|---|---|---|
| 92154 | 1 | 1 |
| 92155 | 1 | 1 |
| 92101 | 0 | 0 |
| 92102 | 0 | 0 |
| 92103 | 0 | 0 |
| 92104 | 0 | 0 |
| 92105 | 0 | 0 |
| 92106 | 0 | 0 |
| 92107 | 0 | 0 |
| 92108 | 0 | 0 |
| 92109 | 0 | 0 |
| 92110 | 0 | 0 |
| 92111 | 0 | 0 |
| 92113 | 0 | 0 |
| 92114 | 0 | 0 |
Common Questions About San Diego Water
These are the most common questions residents search for about water quality in San Diego, California:
Is San Diego water hard or soft? Water hardness varies by source. San Diego's 9 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink San Diego 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 San Diego? Based on detected contaminants, a reverse osmosis (under-sink) filter is most recommended. See our Water Filter Matcher for personalized recommendations.
San Diego vs. California Average
Understanding how San Diego 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 San Diego.
ZIP Codes in San Diego
San Diego spans 81 ZIP codes. EPA water-system coverage is available for 40 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.