Simi Valley, CA: 18 Violations — 61/100 (2026)
6 ZIP codes · 7 water systems · Updated 2026-06-03
Public water data for Simi Valley, CA reveals a split picture — tap water quality varies meaningfully by service area and the city's grade reflects that variability.
How Simi Valley Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Simi Valley, CA
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
Safety grade breakdown for Simi Valley's 6 ZIP codes.
Key Facts for Simi Valley Residents
- Your city's water systems recorded 18 violations in the past 5 years.
- Average lead level: 0.0012 mg/L.
- Estimated remediation: $800 per household.
- CDC health risk index: 10.84.
Simi Valley's Water Providers
With 3 utilities splitting service in Simi Valley, CA, water accountability is distributed across 7 systems on the federal record.
Overview
We track water quality and home safety data for 6 ZIP codes in Simi Valley, California, covering 7 community water systems serving approximately 128,695 people.
6 of 6 ZIP codes (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Simi Valley: C (61/100)
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
Simi Valley water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0012 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
- Zone 1 (High): 6 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Lead | Inorganic | 7 | 6 |
| Surface Water Treatment Rule | Treatment Technique | 7 | 6 |
| Consumer Confidence Report Rule | Reporting | 7 | 6 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 93062 | C | 3 | 0 | Ventura Wwd No. 8 - Simi Valley |
| 93063 | C | 3 | 0 | Ventura Wwd No. 8 - Simi Valley |
| 93065 | C | 3 | 0 | Ventura Wwd No. 8 - Simi Valley |
| 93093 | C | 3 | 0 | Ventura Wwd No. 8 - Simi Valley |
| 93094 | C | 3 | 0 | Ventura Wwd No. 8 - Simi Valley |
| 93099 | C | 3 | 0 | Ventura Wwd No. 8 - Simi Valley |
All ZIP Codes in Simi Valley
- 93062 [C] — 3 violations
- 93063 [C] — 3 violations
- 93065 [C] — 3 violations
- 93093 [C] — 3 violations
- 93094 [C] — 3 violations
- 93099 [C] — 3 violations
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.
Simi Valley Community Health Snapshot
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
What's in Simi Valley's Water?
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Remediation Costs Compare in Simi Valley
In Simi Valley, the equity impact of remediation is proportionally small — not the kind of financial commitment that rises to the level of a genuine planning constraint, but a minor share of what most properties here are worth.
Remediation costs in Simi Valley are relatively low compared to home values. The $267–$1,400 estimated range is a small fraction of median property value. Home values are 3% above the California average.
Simi Valley: Lead Risk & Vulnerable Populations
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Lead risk in Simi Valley appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Simi Valley: Flood History & Water Damage Risk
The NFIP claim record for Simi Valley — 95 filed incidents — reflects genuine, recurring flood exposure rather than an isolated event or two. When a community accumulates flood claims at this volume and carries 33% of its ZIP codes inside FEMA-designated zones, flood history starts to factor into water quality planning in ways it doesn't for lower-exposure areas. Flooding introduces specific contamination pathways — runoff overwhelming treatment facility intake, surface water infiltrating private wells, and pressure disruptions in distribution systems allowing backflow — all of which become more relevant as flood frequency increases.
Simi Valley has a moderate flood history with 95 FEMA claims averaging $1,653 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>$800</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 Simi Valley
- 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. Filters rated for Lead can reduce the most common contaminant found in Simi Valley's water.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
Deep Dive Reports
Detailed analysis for Simi Valley, CA