Seven Bays Estates Unlimited
EPA ID: WA5377651 · 431 people served · 1 ZIP code
In the most recent five-year monitoring window, Seven Bays Estates Unlimited posted zero EPA violations serving 431 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Seven Bays Estates Unlimited Source: EPA SDWIS service area boundaries.
Service area boundary
💧 Where Does Your Water Come From?
Seven Bays Estates Unlimited's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 2% of homes in Spokane County, Washington rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 80th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Washington
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Seven Bays Estates Unlimited (EPA ID: WA5377651) is a community water system in Washington that serves approximately 431 people from groundwater sources.
This system serves ZIP code 99020 in Marshall.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
- 99020 — Marshall
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Seven Bays Estates Unlimited (WA5377651) on EPA.gov.
Frequently Asked Questions
Is Seven Bays Estates Unlimited water safe to drink?
Based on EPA records, Seven Bays Estates Unlimited has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Seven Bays Estates Unlimited serve?
Seven Bays Estates Unlimited serves approximately 431 people across 1 ZIP code in Washington.
Where does Seven Bays Estates Unlimited get its water?
The primary water source is groundwater.