Public water system · MO6010368
ActiveHillsboro Pws
At a glance
Hillsboro Pws (PWSID MO6010368) is an active community water system in Jefferson County, Missouri. It reports serving 3,000 people through 1,310 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in September 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,000
Service connections
1,310
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Hillsboro Pws compare with other water systems in Jefferson County?
By EPA's size categories, Hillsboro Pws is a small system (501 to 3,300 people). Jefferson County has 92 active public water systems. Its population served is about 48% above the county average of 2,034 people per system, and accounts for 1.6% of the 187,106 people reported by systems filed under the county. Across Missouri, the 2,943 active systems average 2,049 people each. Nationally, the average active community water system reports serving 6,703 people, so Hillsboro Pws is about 55% 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. Missouri has 1,612 active community water systems, 55% of the state's 2,943 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,521 Missouri systems (86%) list groundwater as their primary source.
Who owns and regulates Hillsboro Pws?
EPA lists Hillsboro Pws as owned by a local government. The MO state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 26 of the 92 active systems in Jefferson County (28%) are also owned by a local government.
Does Hillsboro Pws have drinking water violations?
Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in September 2025. The violations listed here began between December 2005 and September 2025. By type: 5 contaminant level above the legal limit, 3 public notice, recordkeeping or other, 2 monitoring and reporting, 1 required treatment not met and 1 monitoring. The contaminant or rule involved most often is Total coliform bacteria (TCR) (7 of them). EPA lists 12 as resolved. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-09-28 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2025-06-30 | Required treatment not metTreatment Technique, Level 1 Assessment (RTCR) · code 2A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2024-02-01 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2022-12-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2019-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2013-12-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2012-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2011-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2011-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2007-12-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2007-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2005-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
The 12 most recent 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.
Hillsboro Pws: frequently asked questions
Who runs Hillsboro Pws?
Hillsboro Pws (PWSID MO6010368) is a community water system owned by a local government. It is regulated by the MO state drinking water program.
How many people does Hillsboro Pws serve?
Hillsboro Pws reports serving 3,000 people through 1,310 service connections in Jefferson County, Missouri.
Where does Hillsboro Pws 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 Hillsboro Pws have any drinking water violations?
Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in September 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 Hillsboro Pws' 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. Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in September 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MO state drinking water program.
Where can I find Hillsboro Pws' water quality report?
As a community water system, Hillsboro Pws 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 Jefferson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Jefferson Co Cons Pwsd C 1 | Jefferson | 37,000 | Community | Purchased surface water |
| Jefferson County Pwsd 1 | Jefferson | 21,113 | Community | Purchased surface water |
| Jefferson County Pwsd 3 | Jefferson | 17,000 | Community | Purchased surface water |
| Jefferson County Pwsd 2 | Jefferson | 16,548 | Community | Surface water |
| Festus Pws | Jefferson | 13,000 | Community | Purchased groundwater under influence |
| Jefferson County Pwsd 10 | Jefferson | 10,000 | Community | Purchased surface water |
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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, “Hillsboro Pws, PWSID MO6010368, Missouri”, https://aquacensus.com/water-systems/missouri/hillsboro-pws-mo6010368 (data as of October 1, 2026).