Public water system · MO1024309
ActiveJohnson County Pwsd 1
At a glance
Johnson County Pwsd 1 (PWSID MO1024309) is an active community water system in Johnson County, Missouri. It reports serving 3,730 people through 1,679 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 3 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
3,730
Service connections
1,679
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Johnson County Pwsd 1 compare with other water systems in Johnson County?
By EPA's size categories, Johnson County Pwsd 1 is a medium system (3,301 to 10,000 people). Johnson County has 15 active public water systems, and Johnson County Pwsd 1 is the 5th-largest of them by population served. Its population served is roughly in line with the county average of 3,883 people per system, and accounts for 6.4% of the 58,237 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 Johnson County Pwsd 1 is about 44% 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 Johnson County Pwsd 1?
EPA lists Johnson County Pwsd 1 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. 10 of the 15 active systems in Johnson County (67%) are also owned by a local government.
Does Johnson County Pwsd 1 have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in July 2025. The violations listed here began between July 2013 and July 2025. By type: 1 reporting, 1 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminants or rules involved are Lead and Copper Rule Revisions, Groundwater Rule and Consumer Confidence Rule. EPA lists 2 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2024-09-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31 | Groundwater Rulecode 0700 | No | Resolved |
| 2013-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
All 3 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.
Johnson County Pwsd 1: frequently asked questions
Who runs Johnson County Pwsd 1?
Johnson County Pwsd 1 (PWSID MO1024309) is a community water system owned by a local government. It is regulated by the MO state drinking water program.
How many people does Johnson County Pwsd 1 serve?
Johnson County Pwsd 1 reports serving 3,730 people through 1,679 service connections in Johnson County, Missouri.
Where does Johnson County Pwsd 1 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 Johnson County Pwsd 1 have any drinking water violations?
EPA's records list 3 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 Johnson County Pwsd 1'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 3 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 MO state drinking water program.
Where can I find Johnson County Pwsd 1's water quality report?
As a community water system, Johnson County Pwsd 1 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 Johnson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Mo American Warrensburg | Johnson | 18,500 | Community | Groundwater |
| Johnson County Pwsd 2 | Johnson | 12,490 | Community | Groundwater |
| Whiteman Air Base | Johnson | 10,106 | Community | Groundwater |
| Johnson County Pwsd 3 | Johnson | 4,700 | Community | Groundwater |
| Knob Noster Pws | Johnson | 2,863 | Community | Groundwater |
| Holden Pws | Johnson | 2,683 | 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, “Johnson County Pwsd 1, PWSID MO1024309, Missouri”, https://aquacensus.com/water-systems/missouri/johnson-county-pwsd-1-mo1024309 (data as of October 1, 2026).