Tarzana, CA Water Safety: 52/100 (2026)
2 ZIP codes · 2 water systems · Updated 2026-06-03
Public water compliance in Tarzana falls below the CA baseline — elevated violation rates are on record.
How Tarzana Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Tarzana Water
- Estimated remediation: $1,000 per household.
- CDC health risk index: 10.71.
Who Supplies Your Water in Tarzana
Structurally, Tarzana, CA's water supply is divided. Federal data identifies 2 water systems in the area, with 2 providers serving the bulk of residential connections. These utilities operate independently, meaning rate-setting authority and EPA compliance accountability are distributed rather than centralized.
Overview
We track water quality and home safety data for 2 ZIP codes in Tarzana, California (population ~30,809), covering 2 community water systems serving approximately 3,875,648 people region-wide.
No EPA violations recorded across any ZIP codes in Tarzana — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Tarzana: D (52/100)
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
Tarzana water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Tarzana
- 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
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 91356 | D | Los Angeles-city, Department of Water & Power | 3,875,566 |
| 91357 | D | DESERT BREEZE MOBILE HOME ESTATES | 82 |
All ZIP Codes in Tarzana
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.
Health Outcomes in Tarzana
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Cost Context: What Remediation Means for Tarzana Homeowners
Because property values in Tarzana comfortably exceed estimated remediation costs, the equity impact here is proportionally small.
Remediation costs in Tarzana are relatively low compared to home values. The $400–$1,700 estimated range is a small fraction of median property value. Home values are 59% above the California average.
Flood & Climate Risk in Tarzana
Measured across the NFIP's multi-decade tracking period, Tarzana shows a moderate flood record — 133 claims and 50% of ZIP codes carrying FEMA flood zone status. For water quality, that combination matters because flood events at this frequency can periodically stress infrastructure: treatment plants, private wells, and distribution systems all face elevated risk during significant flooding.
Tarzana has a moderate flood history with 133 FEMA claims averaging $5,679 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.
What You Can Do in Tarzana
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Tarzana, CA