Quistorff
EPA ID: WA5370550 · 1,113 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for Quistorff (WA5370550): PFAS sampling above the current EPA limit (UCMR5). Water monitoring history at Quistorff shows a clean slate - EPA tracking over the past five years turned up no violations, and 1,113 residents continue to receive fully compliant service.
Data: EPA SDWIS
Service Area Map
Coverage area for Quistorff Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Quistorff serves a community with a median household income of $122,827 and an estimated 19,784 residents across its service area.
💧 Where Does Your Water Come From?
Quistorff'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.
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
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
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 | N/A |
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: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
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 the full compliance record 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: Above Current MCL
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). One or more PFAS compounds were measured above 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 →
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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title = {{Quistorff Water Quality Report, WA}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/wa5370550/}
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