City of Grand Coulee Water Department
EPA ID: WA5328700 · 1,428 people served · 1 ZIP code
Zero violations in five consecutive years of EPA monitoring — City of Grand Coulee Water Department has held a clean track record across every reporting cycle in that span, with no enforcement activity of any kind on file for the full service population of 1,428 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for City of Grand Coulee Water Department Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The City of Grand Coulee Water Department serves a community with a median household income of $49,625 and an estimated 1,341 residents across its service area. Approximately 77% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 63% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
💧 Where Does Your Water Come From?
City of Grand Coulee 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 Grant 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
City of Grand Coulee Water Department (EPA ID: WA5328700) is a community water system in Washington that serves approximately 1,428 people from groundwater sources.
This system serves ZIP code 99133 in Grand Coulee.
Average Home Safety Score: B (83/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 99133 | 0.0032 mg/L | No | N/A |
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
- 99133 — Grand Coulee
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for City of Grand Coulee Water Department (WA5328700) on EPA.gov.
Frequently Asked Questions
Is City of Grand Coulee Water Department water safe to drink?
Based on EPA records, City of Grand Coulee Water Department has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does City of Grand Coulee Water Department serve?
City of Grand Coulee Water Department serves approximately 1,428 people across 1 ZIP code in Washington.
Where does City of Grand Coulee Water Department get its water?
The primary water source is groundwater.