Onalaska Water Supply Corporation

ZipCheckup's reading of EPA SDWIS for Onalaska Water Supply Corporation (TX1870009): 1 EPA violation in the last five years. Looking at the EPA enforcement file for Onalaska Water Supply Corporation, 1 violation appear in the five-year dataset, but none remain open - the utility has addressed each finding and is in current compliance, with no pending enforcement affecting the 5,289 people in its service area.

Data: EPA SDWIS

System Overview

Onalaska Water Supply Corporation (EPA ID: TX1870009) is a community water system in Texas that serves approximately 5,289 people from groundwater sources.

This system serves ZIP code 77360 in Onalaska.

ZIP-Area Home Safety Context: B (83/100)

This is the average Home Safety Score for 1 of 1 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: 1 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 3 (Low Risk)

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 TX or modeled from parcel and building-footprint data.

• 77360 - Onalaska

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Onalaska Water Supply Corporation (TX1870009) on EPA.gov.

Frequently Asked Questions

Is Onalaska Water Supply Corporation water safe to drink?

The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Onalaska Water Supply Corporation; its 1 accepted 2021-2026 record are resolved or archived. Historical compliance status does not establish conditions at a specific tap.

How many people does Onalaska Water Supply Corporation serve?

Onalaska Water Supply Corporation serves approximately 5,289 people across 1 ZIP code in Texas.

Where does Onalaska Water Supply Corporation get its water?

The primary water source is groundwater.

@misc{zipcheckup-water-system-tx1870009,
  author = {{ZipCheckup}},
  title  = {{Onalaska Water Supply Corporation (TX): 1 EPA Violation}},
  year   = {n.d.},
  url    = {https://zipcheckup.com/water-system/tx1870009/}
}