Graham Hill Mutual Water Company Inc.
EPA ID: WA5328650 · 1,474 people served · 4 ZIP codes
Graham Hill Mutual Water Company Inc. recorded 1 EPA violation over the past five years, all of which have since been resolved — the utility is currently in compliance serving 1,474 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Graham Hill Mutual Water Company Inc. Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The Graham Hill Mutual Water Company Inc. serves a community with a median household income of $113,902 and an estimated 58,934 residents across its service area.
💧 Where Does Your Water Come From?
Graham Hill Mutual Water Company Inc.'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 Pierce 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
Detected Contaminants
How Graham Hill Mutual Water Company Inc. compares to EPA limits
What This Means For You
Surface Water Treatment Rule at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 5 detections recorded. 2 exceed federal EPA limits (4 ppt for PFOA/PFOS).
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
Graham Hill Mutual Water Company Inc. (EPA ID: WA5328650) is a community water system in Washington that serves approximately 1,474 people from groundwater sources.
This system provides water to 4 ZIP codes across 4 communities.
Average Home Safety Score: B (81/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 1, 2023 | Surface Water Treatment Rule | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Surface Water Treatment Rule | Treatment Failure | 1 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 98338 | 0.0023 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
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
Coverage: 3 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 1 additional ZIP inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Graham Hill Mutual Water Company Inc. (WA5328650) on EPA.gov.
Frequently Asked Questions
Is Graham Hill Mutual Water Company Inc. water safe to drink?
Graham Hill Mutual Water Company Inc. has only monitoring/reporting violations, which are procedural in nature. The system meets federal health-based standards.
How many people does Graham Hill Mutual Water Company Inc. serve?
Graham Hill Mutual Water Company Inc. serves approximately 1,474 people across 4 ZIP codes in Washington.
Where does Graham Hill Mutual Water Company Inc. get its water?
The primary water source is groundwater.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
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
Graham Hill Mutual Water Company Inc. (EPA ID: WA5328650) — request the latest Consumer Confidence Report or ask about specific contaminants.