Public water system · MO6024304
ActiveJefferson County Pwsd 12
At a glance
Jefferson County Pwsd 12 (PWSID MO6024304) is an active community water system in Jefferson County, Missouri. It reports serving 3,300 people through 1,507 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 2014.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,300
Service connections
1,507
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Jefferson County Pwsd 12 compare with other water systems in Jefferson County?
By EPA's size categories, Jefferson County Pwsd 12 is a small system (501 to 3,300 people). Jefferson County has 92 active public water systems. Its population served is about 62% above the county average of 2,034 people per system, and accounts for 1.8% 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 Jefferson County Pwsd 12 is about half of 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 Jefferson County Pwsd 12?
EPA lists Jefferson County Pwsd 12 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 Jefferson County Pwsd 12 have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in July 2014. The violations listed here began between July 1998 and July 2014. By type: 2 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 2 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 |
|---|---|---|---|---|
| 2014-07-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1998-07-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
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.
Jefferson County Pwsd 12: frequently asked questions
Who runs Jefferson County Pwsd 12?
Jefferson County Pwsd 12 (PWSID MO6024304) is a community water system owned by a local government. It is regulated by the MO state drinking water program.
How many people does Jefferson County Pwsd 12 serve?
Jefferson County Pwsd 12 reports serving 3,300 people through 1,507 service connections in Jefferson County, Missouri.
Where does Jefferson County Pwsd 12 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 Jefferson County Pwsd 12 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 2014. 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 Jefferson County Pwsd 12'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 2014. For current results, consult the system's annual water quality report, EPA ECHO, or the MO state drinking water program.
Where can I find Jefferson County Pwsd 12's water quality report?
As a community water system, Jefferson County Pwsd 12 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, “Jefferson County Pwsd 12, PWSID MO6024304, Missouri”, https://aquacensus.com/water-systems/missouri/jefferson-county-pwsd-12-mo6024304 (data as of October 1, 2026).