Lemon Grove, CA: reliable drinking water, above-average safety record, few violations.

Data: EPA SDWIS Last verified: 2026-06-03

Overview

We track water quality and home safety data for 2 ZIP codes in Lemon Grove, California (population ~27,531), covering 4 community water systems serving approximately 1,901,055 people region-wide.

No EPA violations recorded across any ZIP codes in Lemon Grove — an excellent indicator of water quality.

Home Safety Score

Average Home Safety Score for Lemon Grove: B (73/100)

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

Lemon Grove water systems draw from: Surface water.

Lead & Copper

• Lead data: not yet available for Lemon Grove
• 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): 2 ZIP codes

Areas with No Violations

All ZIP Codes in Lemon Grove

• 91945 [B]
• 91946 [B]

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.

Cost Context: What Remediation Means for Lemon Grove Homeowners

Placing remediation in the context of Lemon Grove's property market, the equity share is low — most homeowners here are weighing a financial commitment that fits comfortably within routine property planning, far from the threshold where remediation becomes a material equity decision rather than a standard upkeep consideration.

Median Home Value

$640,500

Est. Remediation

$1,200

Remediation as % of home value 0.2%

Remediation costs in Lemon Grove are relatively low compared to home values. The $800–$1,800 estimated range is a small fraction of median property value. Home values are 13% below the California average.

Flood & Climate Risk in Lemon Grove

Although Lemon Grove's flood history doesn't reach high-severity thresholds, NFIP data documents 10 claims and FEMA maps place 50% of ZIP codes in designated flood zones — a combined profile that makes flood-related water quality considerations a reasonable planning baseline.

10

Total FEMA Flood Claims

$9,876

Avg Claim Payout

50%

ZIPs in FEMA Flood Zones

~1

Est. Claims/Year

Lemon Grove has a moderate flood history with 10 FEMA claims averaging $9,876 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.