Unlike many cities its size in CA, San Bernardino keeps health-based violation rates low — systems here score at or above the state average for tap water safety, with no systemic concerns flagged in the current data set.

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

Water Quality Map: San Bernardino, CA

Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.

A B C D F

Overview

We track water quality and home safety data for 18 ZIP codes in San Bernardino, California (population ~255,071), covering 17 community water systems serving approximately 823,591 people region-wide.

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

Home Safety Score

Average Home Safety Score for San Bernardino: B (72/100)

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

San Bernardino water systems draw from: Groundwater, Surface water.

Lead & Copper

• Lead data: not yet available for San Bernardino
• 0 ZIP codes exceed the EPA lead action level

Radon Risk

Dominant radon zone: Zone 2 (Moderate Risk)

• Zone 1 (High): 0 ZIP codes
• Zone 2 (Moderate): 18 ZIP codes
• Zone 3 (Low): 0 ZIP codes

The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.

Areas with No Violations

All ZIP Codes in San Bernardino

• 92401 [B]
• 92402 [B]
• 92403 [B]
• 92404 [C]
• 92405 [B]
• 92406 [B]
• 92407 [B]
• 92408 [B]
• 92410 [B]
• 92411 [B]
• 92412 [B]
• 92413 [B]
• 92414 [B]
• 92415 [B]
• 92418 [B]
• 92423 [B]
• 92424 [B]
• 92427 [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.

San Bernardino: Remediation Cost in Perspective

When remediation costs are measured against San Bernardino home values, the resulting ratio is in the low tier — addressing documented water and safety issues here claims only a minor fraction of typical equity, and most homeowners are in a position where the financial commitment is straightforward rather than a material burden on their household budget.

Median Home Value

$376,800

Est. Remediation

$1,072

Remediation as % of home value 0.3%

Remediation costs in San Bernardino are relatively low compared to home values. The $439–$1,794 estimated range is a small fraction of median property value. Home values are 49% below the California average.

Climate-Related Water Risk for San Bernardino

A moderate NFIP record for San Bernardino — 152 insurance claims paired with 33% of ZIP codes in FEMA flood zones — points to a flood history where water-quality pathways have likely been periodically relevant.

152

Total FEMA Flood Claims

$6,445

Avg Claim Payout

33%

ZIPs in FEMA Flood Zones

~8

Est. Claims/Year

San Bernardino has a moderate flood history with 152 FEMA claims averaging $6,445 per payout. 33% 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>$1,072</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.