Public water system · MS0360069
ActiveTwelve Oaks Water System
At a glance
Twelve Oaks Water System (PWSID MS0360069) is an active community water system in Lafayette County, Missouri. It reports serving 314 people through 119 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 9 violations for this system; 1 is health-based, and the most recent began in December 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
314
Service connections
119
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Twelve Oaks Water System compare with other water systems in Lafayette County?
By EPA's size categories, Twelve Oaks Water System is a very small system (500 people or fewer). Lafayette County has 15 active public water systems. Its population served is well below the county average of 2,506 people per system, and accounts for 0.8% of the 37,596 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 Twelve Oaks Water System is well 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 Twelve Oaks Water System?
EPA lists Twelve Oaks Water System as privately owned. The MS state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 2 of the 15 active systems in Lafayette County (13%) are also privately owned.
Does Twelve Oaks Water System have drinking water violations?
EPA's records list 9 violations for this system; 1 is health-based, and the most recent began in December 2023. The violations listed here began between July 2015 and December 2023. By type: 3 monitoring, 3 monitoring and reporting, 2 public notice, recordkeeping or other and 1 required treatment not met. The contaminant or rule involved most often is Revised Total Coliform Rule (3 of them). EPA lists 9 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 |
|---|---|---|---|---|
| 2023-12-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2023-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2023-06-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2023-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2022-03-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2022-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2019-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2016-09-01 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2015-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
All 9 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.
Twelve Oaks Water System: frequently asked questions
Who runs Twelve Oaks Water System?
Twelve Oaks Water System (PWSID MS0360069) is a community water system privately owned. It is regulated by the MS state drinking water program.
How many people does Twelve Oaks Water System serve?
Twelve Oaks Water System reports serving 314 people through 119 service connections in Lafayette County, Missouri.
Where does Twelve Oaks Water System 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 Twelve Oaks Water System have any drinking water violations?
EPA's records list 9 violations for this system; 1 is health-based, and the most recent began in December 2023. 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 Twelve Oaks Water System'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 9 violations for this system; 1 is health-based, and the most recent began in December 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the MS state drinking water program.
Where can I find Twelve Oaks Water System's water quality report?
As a community water system, Twelve Oaks Water System 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 Lafayette County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Lafayette County Pwsd 1 | Lafayette | 8,250 | Community | Purchased groundwater |
| Laf Jo Saline County Cons Pwsd 2 | Lafayette + 2 more | 7,180 | Community | Purchased surface water |
| Odessa Pws | Lafayette | 5,202 | Community | Groundwater |
| Higginsville Pws | Lafayette | 4,800 | Community | Surface water |
| Lexington Pws | Lafayette | 4,729 | Community | Groundwater |
| Concordia Pws | Lafayette | 2,500 | Community | 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, “Twelve Oaks Water System, PWSID MS0360069, Missouri”, https://aquacensus.com/water-systems/missouri/twelve-oaks-water-system-ms0360069 (data as of October 1, 2026).