Pattison 500
EPA ID: WA5366578 · 4,643 people served · 2 ZIP codes
ZipCheckup's reading of EPA SDWIS for Pattison 500 (WA5366578): no EPA violations recorded in the last five years. Water monitoring history at Pattison 500 shows a clean slate - EPA tracking over the past five years turned up no violations, and 4,643 residents continue to receive fully compliant service.
Data: EPA SDWIS
Service Area Map
Coverage area for Pattison 500 Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Pattison 500 serves a community with a median household income of $104,803 and an estimated 43,016 residents across its service area.
💧 Where Does Your Water Come From?
Pattison 500'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 70th 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. 4 detections recorded.
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
Pattison 500 (EPA ID: WA5366578) is a community water system in Washington that serves approximately 4,643 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0031 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.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Pattison 500 (WA5366578) on EPA.gov.
Frequently Asked Questions
Is Pattison 500 water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Pattison 500 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 Pattison 500 serve?
Pattison 500 serves approximately 4,643 people across 2 ZIP codes in Washington.
Where does Pattison 500 get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
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.). Pattison 500 Water Quality Report, WA. https://zipcheckup.com/water-system/wa5366578/
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