Water Quality in Fullerton, CA: 7 Violations Recorded for Mapped Water Systems
7 water systems · 4 directly mapped ZIP records
Available EPA records report 7 violations across 4 directly mapped ZIP records with known counts for Fullerton. 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 Fullerton
This table shows typed EPA water evidence only. Missing violation counts are displayed as N/A, not zero.
| ZIP Code | Violations | Health | |
|---|---|---|---|
| 92833 | 7 | 0 | View report → |
| 92831 | 3 | 0 | View report → |
| 92832 | 3 | 0 | View report → |
| 92835 | 0 | 0 | View report → |
Water Quality Overview
Fullerton, California has directly mapped EPA water-system data for 4 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 7 violations (all classified as monitoring/reporting type in the available record) across 4 directly mapped ZIP records with reported counts.
Lead Levels
The average of the reported 90th-percentile lead results across the ZIP codes of Fullerton is 0.0015 mg/L; the EPA action level of 0.015 mg/L applies to a water system's own 90th-percentile result and is not a safety threshold (EPA's health goal for lead is zero). No exceedances appear among the 4 ZIP records with known lead status.
With 79% of homes built before 1986, Fullerton 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 Fullerton
Fullerton is served by 7 community water systems regulated under the Safe Drinking Water Act. About 140,986 people live in the area (8 ZIP codes, Census); this is not the systems' reported service population.
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
EPA records list enforcement actions against water systems serving Fullerton. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Fullerton
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 Fullerton Water Systems
The following contaminants have been detected or caused violations across Fullerton's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 3 | 3 | No |
| Chlorine | Disinfectant | 4 mg/L (MRDL) | 2 | 1 | No |
The standard column shows the EPA Maximum Contaminant Level (MCL) except for lead and copper, whose value is an action level that triggers corrective steps and is not an MCL. Health-based violations are MCL, MRDL and treatment-technique violations.
EPA Enforcement History
The EPA and state regulators have taken enforcement actions against water systems serving Fullerton. Recent actions:
| Date | Action Type |
|---|---|
| 2026-01-06 | State Order Extension |
| 2025-10-31 | State Filed Judgment |
| 2025-07-10 | State Order Extension |
| 2025-05-18 | State Filed Suit |
| 2025-05-05 | State Order Extension |
| 2025-01-10 | State Order Extension |
| 2024-10-04 | State Order Extension |
| 2024-09-23 | State Filed Suit |
| 2022-11-18 | State Filed Judgment |
| 2022-11-11 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2026-01-06.
Fullerton vs. Nearby California Cities
How Fullerton's water quality compares to similar cities in California:
| City | Direct EPA ZIPs | Violations | Systems | Population |
|---|---|---|---|---|
| Fullerton | 4 | 7 | 7 | 140,986 |
| San Mateo | 4 | 1 | 3 | 140,535 |
| Brandeis | 1 | 3 | 4 | 142,477 |
| Murrieta | 2 | 0 | 6 | 142,976 |
Water Quality by ZIP Code in Fullerton
EPA coverage and recorded violations can differ across Fullerton's ZIP codes. Missing counts are shown as unavailable, not zero:
Common Questions About Fullerton Water
These are the most common questions residents search for about water quality in Fullerton, California:
Is Fullerton water hard or soft? Water hardness varies by source. Fullerton's 7 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Fullerton tap water? City-level EPA records cannot determine safety at a specific tap. No health-based violations are recorded across 4 directly mapped ZIP records with known counts, but this is not a property-level safety guarantee.
What is the best water filter for Fullerton? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Fullerton vs. California Average
Understanding how Fullerton 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 Fullerton.
ZIP Codes in Fullerton
Fullerton spans 8 ZIP codes. EPA water-system coverage is available for 4 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.