Tap water in La Mesa, CA scores well - low violation counts, above-average safety grade.

Data: EPA SDWIS

Overview

We track home safety data for 4 ZIP codes in La Mesa, California (population ~74,626), covering 3 community water systems serving approximately 1,901,055 people region-wide. The EPA snapshots used for this build directly map water systems to 2 of 4 ZIP codes.

The available EPA record reports 0 violations for 2 ZIP codes with a reported violation count.

Home Safety Score

Average Home Safety Score for La Mesa: A (92/100)

Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:

Factor	What It Measures
Water Quality	EPA violations and compliance history
PFAS MCL Screen	UCMR 5 testing against the covered federal MCLs
Radon Risk	EPA radon zone classification
Annual AQI	EPA AirData county-year median with at least 90 observed days

Water Sources

La Mesa water systems draw from: Surface water.

Lead & Copper

• Average lead level (90th percentile): 0.0000 mg/L (EPA action level: 0.015 mg/L)
• 0 of 2 ZIP codes with known status 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

All ZIP Codes in La Mesa

• 91941 [A]
• 91942 [A]
• 91943
• 91944

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

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

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.

Median Home Value

$884,800

Est. Remediation

$1,200

Remediation as % of home value 0.1%

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.

Historical NFIP Claim Context in La Mesa

42

Total FEMA Flood Claims

$12,673

Avg Reported Sum With Payment Data

0%

A/V Share of Claim-Record ZIPs

Historical NFIP data for La Mesa contains 42 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $12,673. Among ZIP codes with claim records, 0% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.

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. The <strong>$1,200</strong> remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.

Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.

Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.