Summit Water & Supply Company
EPA ID: WA5385050 · 16,109 people served · 40 ZIP codes
With a five-year violation-free history, Summit Water & Supply Company delivers safe water to 16,109 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Summit Water & Supply Company Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Summit Water & Supply Company serves a community with a median household income of $88,121 and an estimated 417,718 residents across its service area. Approximately 62% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Summit Water & Supply Company'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
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 77 detections recorded. 14 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
Summit Water & Supply Company (EPA ID: WA5385050) is a community water system in Washington that serves approximately 16,109 people from groundwater sources.
This system provides water to 40 ZIP codes across 2 communities.
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
Coverage: 6 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 34 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
This system serves 40 ZIP codes:
98371 · 98373 · 98401 · 98402 · 98403 98404 · 98405 · 98406 · 98407 · 98408 98409 · 98411 · 98412 · 98413 · 98415 98416 · 98417 · 98418 · 98419 · 98421 98422 · 98424 · 98431 · 98433 · 98442 98443 · 98444 · 98445 · 98446 · 98447 98448 · 98455 · 98460 · 98464 · 98465 98466 · 98471 · 98481 · 98490 · 98493
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Summit Water & Supply Company (WA5385050) on EPA.gov.
Frequently Asked Questions
Is Summit Water & Supply Company water safe to drink?
Based on EPA records, Summit Water & Supply Company has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Summit Water & Supply Company serve?
Summit Water & Supply Company serves approximately 16,109 people across 40 ZIP codes in Washington.
Where does Summit Water & Supply Company get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
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.