CITY OF Rock Island Water Department
EPA ID: WA5373401 · 3,226 people served · 2 ZIP codes
Five years of EPA monitoring have produced no violations for CITY OF Rock Island Water Department — the supplier serving 3,226 residents has kept every contaminant level within federal limits, a result that places it among the top-performing utilities for systems with a service population of comparable size.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for CITY OF Rock Island Water Department Source: EPA SDWIS service area boundaries.
Service area boundary — Grade C
Service Area Demographics
The CITY OF Rock Island Water Department serves a community with a median household income of $64,716 and an estimated 1,988 residents across its service area. Approximately 67% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
CITY OF Rock Island Water Department'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 1% of homes in Douglas County, Washington rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
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
Rock Island Water Dept City of (EPA ID: WA5373401) is a community water system in Washington that serves approximately 3,226 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Average Home Safety Score: C (63/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
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
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for CITY OF Rock Island Water Department (WA5373401) on EPA.gov.
Frequently Asked Questions
Is CITY OF Rock Island Water Department water safe to drink?
Based on EPA records, CITY OF Rock Island Water Department has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does CITY OF Rock Island Water Department serve?
CITY OF Rock Island Water Department serves approximately 3,226 people across 2 ZIP codes in Washington.
Where does CITY OF Rock Island Water Department get its water?
The primary water source is groundwater.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
CITY OF Rock Island Water Department (EPA ID: WA5373401) — request the latest Consumer Confidence Report or ask about specific contaminants.