Public water system · TX1870009
ActiveOnalaska WSC
At a glance
Onalaska WSC (PWSID TX1870009) is an active community water system in Polk County, Texas. It reports serving 5,289 people through 2,042 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; none is health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
5,289
Service connections
2,042
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Onalaska WSC compare with other water systems in Polk County?
By EPA's size categories, Onalaska WSC is a medium system (3,301 to 10,000 people). Polk County has 65 active public water systems, and Onalaska WSC is the 3rd-largest of them by population served. Its population served is about 5.2 times the county average of 1,023 people per system, and accounts for 8% of the 66,493 people reported by systems filed under the county. Across Texas, the 7,078 active systems average 4,789 people each. Nationally, the average active community water system reports serving 6,703 people, so Onalaska WSC is about 21% below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Texas has 4,594 active community water systems, 65% of the state's 7,078 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 5,215 Texas systems (74%) list groundwater as their primary source.
Who owns and regulates Onalaska WSC?
EPA lists Onalaska WSC as owned by a local government. The TX state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 23 of the 65 active systems in Polk County (35%) are also owned by a local government.
Does Onalaska WSC have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in July 2025. The violations listed here began between May 1991 and July 2025. By type: 1 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminants or rules involved are Consumer Confidence Rule and Total coliform bacteria (TCR). EPA lists 1 as resolved and 1 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1991-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 2 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Onalaska WSC: frequently asked questions
Who runs Onalaska WSC?
Onalaska WSC (PWSID TX1870009) is a community water system owned by a local government. It is regulated by the TX state drinking water program.
How many people does Onalaska WSC serve?
Onalaska WSC reports serving 5,289 people through 2,042 service connections in Polk County, Texas.
Where does Onalaska WSC get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Onalaska WSC have any drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in July 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Onalaska WSC's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 2 violations for this system; none is health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the TX state drinking water program.
Where can I find Onalaska WSC's water quality report?
As a community water system, Onalaska WSC must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Polk County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Livingston | Polk | 15,199 | Community | Purchased surface water |
| Lake Livingston Pineshadows East | Polk | 5,675 | Community | Surface water |
| Lake Livingston Oakridge North | Polk | 3,284 | Community | Surface water |
| Tempe WSC 1 | Polk | 2,725 | Community | Groundwater |
| Soda WSC | Polk | 2,237 | Community | Groundwater |
| Providence WSC | Polk | 2,051 | Community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Onalaska WSC, PWSID TX1870009, Texas”, https://aquacensus.com/water-systems/texas/onalaska-wsc-tx1870009 (data as of October 1, 2026).