Water monitoring across North Hills paints a mid-range picture within CA — solid compliance in some service zones, documented concerns in others. Most violations on record are concentrated in specific areas, and the overall grade has held in the middle tier without major shifts in recent monitoring cycles.

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

Overview

We track water quality and home safety data for 2 ZIP codes in North Hills, California (population ~61,607), covering 2 community water systems serving approximately 3,899,512 people region-wide.

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

Home Safety Score

Average Home Safety Score for North Hills: C (58/100)

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

North Hills water systems draw from: Groundwater.

Lead & Copper

• Lead data: not yet available for North Hills
• 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): 2 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 North Hills

• 91343 [C]
• 91393 [D]

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 North Hills Homeowners

In North Hills, property wealth outpaces what documented remediation typically demands — the equity burden lands well within the low tier.

Median Home Value

$751,000

Est. Remediation

$1,000

Remediation as % of home value 0.1%

Remediation costs in North Hills are relatively low compared to home values. The $400–$1,700 estimated range is a small fraction of median property value. Home values are 2% above the California average.

Flood & Climate Risk in North Hills

Across the NFIP's long tracking period, North Hills shows 9 claims and 50% of ZIP codes within FEMA-designated flood zones — figures that place it in moderate flood exposure territory. At this level, the water-quality implications of flooding — contaminated wells, stressed treatment intake, distribution backflow — move from theoretical edge cases to genuine periodic risks, particularly during higher-severity events.

9

Total FEMA Flood Claims

$2,985

Avg Claim Payout

50%

ZIPs in FEMA Flood Zones

North Hills has a moderate flood history with 9 FEMA claims averaging $2,985 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>$1,000</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.