La Mesa, CA Water Safety: 95/100 (2026)
4 ZIP codes · 4 water systems · Updated 2026-06-03
Tap water in La Mesa, CA scores well — low violation counts, above-average safety grade.
How La Mesa Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About La Mesa Water
- Average lead level: 0.0023 mg/L.
- Estimated remediation: $1,200 per household.
- CDC health risk index: 10.18.
Who Supplies Your Water in La Mesa
Across La Mesa, CA, residential water comes from 3 primary utilities rather than a single consolidated provider. Each system operates independently — managing its own distribution infrastructure, rate schedules, and EPA compliance filings. Federal records track 4 water systems in the area, with these top providers accounting for the majority of residential connections.
Overview
We track water quality and home safety data for 4 ZIP codes in La Mesa, California (population ~74,626), covering 4 community water systems serving approximately 1,901,055 people region-wide.
No EPA violations recorded across any ZIP codes in La Mesa — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for La Mesa: 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
La Mesa water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0023 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): 4 ZIP codes
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 91941 | A | Helix Water District | 277,668 |
| 91942 | A | Helix Water District | 277,668 |
| 91943 | A | Helix Water District | 277,668 |
| 91944 | A | Helix Water District | 277,668 |
All ZIP Codes in La Mesa
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 La Mesa
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 La Mesa Homeowners
For most homeowners in La Mesa, the estimated cost of water and safety remediation represents a proportionally modest share of what properties are worth — placing this area in the lower tier of the remediation share scale.
Remediation costs in La Mesa are relatively low compared to home values. The $800–$1,800 estimated range is a small fraction of median property value. Home values are 20% above the California average.
Lead Exposure Risk for Children in La Mesa
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 La Mesa 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 La Mesa
50% of ZIP codes in La Mesa are mapped into FEMA-designated flood zones, and the NFIP records 42 claims reflecting a multi-event flood history. That combination places local flood exposure in the range where water-quality implications deserve at least periodic attention.
La Mesa has a moderate flood history with 42 FEMA claims averaging $8,888 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>$1,200</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 La Mesa, CA