Looking at federal monitoring data for Torrance, CA: the city clears benchmarks set under the Safe Drinking Water Act with room to spare — recorded exceedances are rare, and the systems serving local households have not triggered any pattern of repeat deficiencies in recent cycles.

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

Water Quality Map: Torrance, 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 10 ZIP codes in Torrance, California (population ~172,123), covering 4 community water systems serving approximately 4,279,745 people region-wide.

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

Home Safety Score

Average Home Safety Score for Torrance: 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

Torrance water systems draw from: Surface water.

Lead & Copper

• Lead data: not yet available for Torrance
• 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): 10 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 Torrance

• 90501 [B]
• 90502 [B]
• 90503 [B]
• 90504 [B]
• 90505 [B]
• 90506 [B]
• 90507 [B]
• 90508 [B]
• 90509 [B]
• 90510 [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.

How Remediation Costs Compare in Torrance

In Torrance, documented water and safety issues can be addressed without making a meaningful dent in home equity — the financial proportionality here is favorable, and the commitment fits within standard property planning frameworks.

Median Home Value

$897,100

Est. Remediation

$1,070

Remediation as % of home value 0.1%

Remediation costs in Torrance are relatively low compared to home values. The $430–$1,810 estimated range is a small fraction of median property value. Home values are 21% above the California average.

Torrance: Flood History & Water Damage Risk

A moderate NFIP record for Torrance — 13 insurance claims paired with 30% of ZIP codes in FEMA flood zones — points to a flood history where water-quality pathways have likely been periodically relevant.

13

Total FEMA Flood Claims

$2,539

Avg Claim Payout

30%

ZIPs in FEMA Flood Zones

~1

Est. Claims/Year

Torrance has a moderate flood history with 13 FEMA claims averaging $2,539 per payout. 30% 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>$1,070</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.