Public water system · KY0183106
ActiveCenter Ridge Water District #4
At a glance
Center Ridge Water District #4 (PWSID KY0183106) is an active community water system in Calloway County, Missouri. It reports serving 105 people through 50 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 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
105
Service connections
50
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Center Ridge Water District #4 compare with other water systems in Calloway County?
By EPA's size categories, Center Ridge Water District #4 is a very small system (500 people or fewer). Calloway County has 4 active public water systems, and Center Ridge Water District #4 is the 4th-largest of them by population served. Its population served is about 56% below the county average of 241 people per system, and accounts for 11% of the 963 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 Center Ridge Water District #4 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 Center Ridge Water District #4?
EPA lists Center Ridge Water District #4 as privately owned. The KY state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 1 of the 4 active systems in Calloway County (25%) are also privately owned.
Does Center Ridge Water District #4 have drinking water violations?
EPA's records list 9 violations for this system; 1 is health-based, and the most recent began in December 2025. The violations listed here began between January 1988 and December 2025. By type: 7 monitoring and reporting, 1 required treatment not met and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Nitrate (2 of them). EPA lists 4 as resolved, 3 as archived and 2 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. 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. 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 |
|---|---|---|---|---|
| 2025-12-22 | Required treatment not metTreatment Technique No Certif. Operator · code 12 | Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400 | Yes | Unaddressed |
| 2025-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Archived |
| 2025-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Archived |
| 2025-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2022-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1999-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1998-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1996-02-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1988-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
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.
Center Ridge Water District #4: frequently asked questions
Who runs Center Ridge Water District #4?
Center Ridge Water District #4 (PWSID KY0183106) is a community water system privately owned. It is regulated by the KY state drinking water program.
How many people does Center Ridge Water District #4 serve?
Center Ridge Water District #4 reports serving 105 people through 50 service connections in Calloway County, Missouri.
Where does Center Ridge Water District #4 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 Center Ridge Water District #4 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 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 Center Ridge Water District #4'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 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the KY state drinking water program.
Where can I find Center Ridge Water District #4's water quality report?
As a community water system, Center Ridge Water District #4 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 Calloway County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Center Ridge Water District #2 | Calloway | 377 | Community | Groundwater |
| Center Ridge Water System | Calloway | 273 | Community | Groundwater |
| Center Ridge Water District #3 | Calloway | 208 | Community | Groundwater |
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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, “Center Ridge Water District #4, PWSID KY0183106, Missouri”, https://aquacensus.com/water-systems/missouri/center-ridge-water-district-4-ky0183106 (data as of October 1, 2026).