Fullerton, CA Water Safety: 95/100 (2026)
8 ZIP codes · 8 water systems · Updated 2026-06-03
Within Fullerton, safety indicators for tap water remain above the CA median — documented violations are infrequent and the city's compliance record sits in the upper tier.
How Fullerton Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Fullerton, CA
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
How ZIP codes in Fullerton score across all safety grades.
What You Should Know About Fullerton Water
- Average lead level: 0.0015 mg/L.
- Estimated remediation: $1,680 per household.
- CDC health risk index: 10.23.
Who Supplies Your Water in Fullerton
Federal records list 8 water systems tied to Fullerton, CA. Of those, 3 are the primary providers, meaning service conditions, rate structures, and compliance histories can differ depending on where a property sits.
Overview
We track water quality and home safety data for 8 ZIP codes in Fullerton, California (population ~140,986), covering 8 community water systems serving approximately 788,942 people region-wide.
No EPA violations recorded across any ZIP codes in Fullerton — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Fullerton: A (95/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Fullerton water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0015 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 8 ZIP codes
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 92831 | A | City of Fullerton | 139,461 |
| 92832 | A | City of Fullerton | 139,461 |
| 92833 | A | City of Fullerton | 139,461 |
| 92834 | A | City of Fullerton | 139,461 |
| 92835 | A | City of Fullerton | 139,461 |
| 92836 | A | City of Fullerton | 139,461 |
| 92837 | A | City of Fullerton | 139,461 |
| 92838 | A | City of Fullerton | 139,461 |
All ZIP Codes in Fullerton
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
Updated daily.
Health Outcomes in Fullerton
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Cost Context: What Remediation Means for Fullerton Homeowners
While no remediation project is entirely without cost, the relationship between estimated remediation and property values in Fullerton is notably favorable — the equity share is small enough that the household financial perspective is one of proportionality rather than pressure, and most homeowners can treat it as routine planning rather than a significant financial event.
Remediation costs in Fullerton are relatively low compared to home values. The $1,120–$2,440 estimated range is a small fraction of median property value. Home values are 14% above the California average.
Lead Exposure Risk for Children in Fullerton
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Lead risk in Fullerton appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Fullerton
The NFIP claim record for Fullerton — 59 filed incidents — reflects genuine, recurring flood exposure rather than an isolated event or two. When a community accumulates flood claims at this volume and carries 50% of its ZIP codes inside FEMA-designated zones, flood history starts to factor into water quality planning in ways it doesn't for lower-exposure areas. Flooding introduces specific contamination pathways — runoff overwhelming treatment facility intake, surface water infiltrating private wells, and pressure disruptions in distribution systems allowing backflow — all of which become more relevant as flood frequency increases.
Fullerton has a moderate flood history with 59 FEMA claims averaging $2,147 per payout. 50% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,680</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Fullerton, CA