Willow Creek, CA: 1 Health Violation — 94/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Across Willow Creek, EPA monitoring data shows low violation rates and healthy safety margins — a pattern that places the city well above CA's average for drinking water compliance across recent reporting cycles.
How Willow Creek Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Willow Creek Residents
- Your city's water systems recorded 3 violations in the past 5 years.
- Average lead level: 0.0026 mg/L.
- Homes built before 1986: 64% — older plumbing may contain lead solder.
- Estimated remediation: $300 per household.
- CDC health risk index: 12.81 — above typical levels.
Willow Creek's Water Providers
Willow Creek, CA draws its water from one primary utility across 1 tracked system.
Overview
We track water quality and home safety data for 1 ZIP code in Willow Creek, California, covering 1 community water system serving approximately 990 people.
1 of 1 ZIP code (100%) have recorded EPA violations. 1 health-based violation documented.
Home Safety Score
Average Home Safety Score for Willow Creek: A (94/100)
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
Willow Creek water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0026 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Stage 2 DBP Rule | Treatment Technique | 6 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 95573 | A | 3 | 1 | Willow Creek C.s.d. |
All ZIP Codes in Willow Creek
- 95573 [A] — 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.
Willow Creek 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 Willow Creek's Water?
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Willow Creek Infrastructure Age
With 64% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Reading the housing age data for Willow Creek — median build year 1972 — the overriding implication is that the plumbing materials inside a typical home here reflect pre-1986 construction standards. In practical terms, that means lead-soldered copper joints are common across much of the housing stock. Where those materials are present, water can leach lead as it moves through joints — a pathway that corrosion control treatment under federal rules is designed to reduce, though it cannot eliminate lead risk where the plumbing materials themselves contain lead.
Over half of homes in Willow Creek were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
How Remediation Costs Compare in Willow Creek
Property equity in Willow Creek runs well ahead of estimated remediation costs — a cost-to-value ratio that sits in the low tier, meaning documented water and safety issues here are the kind homeowners can plan to address without treating the expense as a significant budget event relative to what their homes are worth.
Remediation costs in Willow Creek are relatively low compared to home values. The $150–$600 estimated range is a small fraction of median property value. Home values are 54% below the California average.
Willow Creek: 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.
64% of Willow Creek housing dates to the pre-rule era, alongside aggregate readings hovering at the federal action mark — household-level confirmation through a draw-test kit fits the local picture.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Deep Dive Reports
Detailed analysis for Willow Creek, CA