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Public Water System
SAMMAMISH PLATEAU WATER & SEWER
PWSID WA5340900 · Washington · 79,362 people served
A
ExcellentSAMMAMISH PLATEAU WATER & SEWER is an EPA-regulated public water system in Washington (PWSID WA5340900). It serves an estimated 79,362 residents — a mid-sized community of customers — across 1 community across 1 ZIP code.
SAMMAMISH PLATEAU WATER & SEWER has maintained full EPA Safe Drinking Water Act compliance over the most recent five-year reporting window. No health-based Maximum Contaminant Level (MCL) exceedances are on record. The grade of A reflects this clean compliance history.
Service Area
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Centered on the averaged ZIP-code centroid of 1 ZIP served.
Population
79,362
Cities
1
ZIPs
1
Violations
0
EPA Health-Based Violations
Health-based Maximum Contaminant Level (MCL) violations on file for SAMMAMISH PLATEAU WATER & SEWER over the past five years of EPA SDWIS reporting.
✅
No health-based violations in the last 5 years.
SAMMAMISH PLATEAU WATER & SEWER's water systems have met EPA health-based Maximum Contaminant Level (MCL) requirements throughout the EPA reporting window. This does not mean zero detection of regulated contaminants — it means all measured concentrations remained below their federal action levels.
Cities Served by SAMMAMISH PLATEAU WATER & SEWER
ZIP Codes Served
About this system
EPA records this system as PWSID WA5340900. Data reflects the most recent EPA SDWIS publication as of 2026-05-18. Public Water System Identifiers (PWSIDs) are assigned by the EPA's Safe Drinking Water Act program to track every regulated water utility in the United States. The first two letters typically indicate the state primacy agency. For real-time water quality information, contact SAMMAMISH PLATEAU WATER & SEWER directly or review their annual Consumer Confidence Report (CCR).
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