Public water system · MO5031397
ActiveThree Hills Subdivision
At a glance
Three Hills Subdivision (PWSID MO5031397) is an active transient non-community water system in Dade County, Missouri. It reports serving 20 people through 32 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in April 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
20
Service connections
32
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Three Hills Subdivision compare with other water systems in Dade County?
By EPA's size categories, Three Hills Subdivision is a very small system (500 people or fewer). Dade County has 19 active public water systems. Its population served is well below the county average of 233 people per system, and accounts for 0.5% of the 4,435 people reported by systems filed under the county. Across Missouri, the 2,943 active systems average 2,049 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Three Hills Subdivision is well below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Missouri has 1,103 active transient non-community water systems, 37% 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 Three Hills Subdivision?
EPA lists Three Hills Subdivision as privately owned. 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. 7 of the 19 active systems in Dade County (37%) are also privately owned.
Does Three Hills Subdivision have drinking water violations?
EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in April 2025. The violations listed here began between June 2004 and April 2025. By type: 4 contaminant level above the legal limit, 3 monitoring and reporting, 2 monitoring and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 10 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 |
|---|---|---|---|---|
| 2025-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2023-07-29 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2022-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2022-07-01 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2013-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2012-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2007-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2005-02-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2004-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2004-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 10 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.
Three Hills Subdivision: frequently asked questions
Who runs Three Hills Subdivision?
Three Hills Subdivision (PWSID MO5031397) is a transient non-community water system privately owned. It is regulated by the MO state drinking water program.
How many people does Three Hills Subdivision serve?
Three Hills Subdivision reports serving 20 people through 32 service connections in Dade County, Missouri.
Where does Three Hills Subdivision 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 Three Hills Subdivision have any drinking water violations?
EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in April 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 Three Hills Subdivision'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 10 violations for this system; 4 are health-based, and the most recent began in April 2025. For current results, consult EPA ECHO, or the MO state drinking water program.
Where can I find Three Hills Subdivision's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Three Hills Subdivision is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Dade County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Greenfield Pws | Dade | 1,400 | Community | Groundwater |
| Lockwood Pws | Dade | 890 | Community | Groundwater |
| Usace Stockton Se Ruark Bluff Area | Dade | 600 | Transient non-community | Groundwater |
| Everton Pws | Dade | 352 | Community | Groundwater |
| Dadeville Pws | Dade | 218 | Community | Groundwater |
| Usace South Mutton Creek Group Camp | Dade | 200 | Transient non-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, “Three Hills Subdivision, PWSID MO5031397, Missouri”, https://aquacensus.com/water-systems/missouri/three-hills-subdivision-mo5031397 (data as of October 1, 2026).