Quistorff
EPA ID: WA5370550 · 1,113 people served · 1 ZIP code
ZipCheckup's reading of EPA records for Quistorff (WA5370550): a UCMR5 PFAS sample above the level of an EPA PFAS MCL, which takes effect in 2029; this is not a violation. No violations appear in the federal EPA file for Quistorff, which supplies 1,113 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Quistorff Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Quistorff have a median household income of $122,827 and about 19,784 residents live in those ZIP codes (Census; not the number of people this system supplies).
💧 Where Does Your Water Come From?
Quistorff's water is classified in EPA records as a groundwater source. 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.
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
System Overview
Quistorff (EPA ID: WA5370550) is a community water system in Washington that serves approximately 1,113 people from groundwater sources.
This system serves ZIP code 98332 in Gig Harbor.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0017 mg/L | No | 2024-12-31 |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
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: Ask your water utility whether running cold water for 2 minutes is enough to flush your plumbing before drinking.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by WA or modeled from parcel and building-footprint data.
- 98332 - Gig Harbor
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Quistorff (WA5370550) on EPA.gov.
Frequently Asked Questions
Is Quistorff water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Quistorff in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Quistorff serve?
Quistorff serves approximately 1,113 people across 1 ZIP code in Washington.
Where does Quistorff get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Sample Above an EPA MCL Value or State Standard
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). One or more PFAS measurements were above the level of the EPA MCL for that compound (April 2024 rule, which takes effect in 2029) or above an applicable state drinking-water standard; a monitoring result above that level is not by itself a violation.
EPA's April 2024 PFAS rule sets MCLs of 4 ppt for PFOA and PFOS and 10 ppt for PFHxS, PFNA and HFPO-DA (GenX); water systems must comply from 2029. Other PFAS compounds have no individual federal MCL. A state standard is shown only where this system's state has its own enforceable PFAS limit. Detection results are EPA UCMR5 samples, not a measurement at your tap.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Quistorff Water Quality Report, WA. https://zipcheckup.com/water-system/wa5370550/
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author = {{ZipCheckup}},
title = {{Quistorff Water Quality Report, WA}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/wa5370550/}
}