Black Diamond Water Department
EPA ID: WA5307220 · 6,407 people served · 3 ZIP codes
ZipCheckup's reading of EPA SDWIS for Black Diamond Water Department (WA5307220): no EPA violations recorded in the last five years. Black Diamond Water Department carries zero EPA violations in five years - a spotless record for a utility serving 6,407 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Black Diamond Water Department Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Black Diamond Water Department serves a community with a median household income of $144,733 and an estimated 47,774 residents across its service area.
💧 Where Does Your Water Come From?
Black Diamond Water Department'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. 16 detections recorded. 3 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
Black Diamond Water Department (EPA ID: WA5307220) is a community water system in Washington that serves approximately 6,407 people from groundwater sources.
This system provides water to 3 ZIP codes across 3 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0015 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 Black Diamond Water Department (WA5307220) on EPA.gov.
Frequently Asked Questions
Is Black Diamond Water Department water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Black Diamond Water Department 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 Black Diamond Water Department serve?
Black Diamond Water Department serves approximately 6,407 people across 3 ZIP codes in Washington.
Where does Black Diamond Water Department get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Black Diamond Water Department Water Quality Report, WA. https://zipcheckup.com/water-system/wa5307220/
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title = {{Black Diamond Water Department Water Quality Report, WA}},
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url = {https://zipcheckup.com/water-system/wa5307220/}
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