City of Moses Lake

ZipCheckup's reading of EPA SDWIS for City of Moses Lake (WA5356300): PFAS sampling above the current EPA limit (UCMR5). Within the five-year EPA monitoring span, City of Moses Lake accumulated 42 violations - every finding has been resolved and the utility operates in full compliance today, supplying water to approximately 32,428 people without any active enforcement proceedings.

Data: EPA SDWIS

System Overview

City of Moses Lake (EPA ID: WA5356300) is a community water system in Washington that serves approximately 32,428 people from groundwater sources.

This system provides water to 2 ZIP codes across 2 communities.

ZIP-Area Home Safety Context: D (50/100)

This is the average Home Safety Score for 1 of 2 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.

Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.

Violation History

Status breakdown for accepted records with record years 2021-2026: 42 resolved, 0 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.

Recent Violations

Contaminants Detected

The following contaminants have been flagged in EPA records for this water system:

Lead & Copper

EPA Lead and Copper Rule evidence attributed directly to this water system:

No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.

Radon Risk in Service Area

Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)

The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.

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.

• 98823 - Ephrata
• 98837 - Moses Lake

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for City of Moses Lake (WA5356300) on EPA.gov.

Frequently Asked Questions

Is City of Moses Lake water safe to drink?

The accepted 2026Q2 ECHO snapshot shows no current noncompliance for City of Moses Lake; its 42 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.

How many people does City of Moses Lake serve?

City of Moses Lake serves approximately 32,428 people across 2 ZIP codes in Washington.

Where does City of Moses Lake get its water?

The primary water source is groundwater.

@misc{zipcheckup-water-system-wa5356300,
  author = {{ZipCheckup}},
  title  = {{City of Moses Lake (WA): 42 EPA Violations}},
  year   = {n.d.},
  url    = {https://zipcheckup.com/water-system/wa5356300/}
}