Public water system · MO5171205
ActiveThornfield Elementary School
At a glance
Thornfield Elementary School (PWSID MO5171205) is an active non-transient non-community water system in Ozark County, Missouri. It reports serving 85 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in June 2017.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
85
Service connections
1
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Thornfield Elementary School compare with other water systems in Ozark County?
By EPA's size categories, Thornfield Elementary School is a very small system (500 people or fewer). Ozark County has 25 active public water systems. Its population served is about half of the county average of 172 people per system, and accounts for 2% of the 4,293 people reported by systems filed under the county. Across Missouri, the 2,943 active systems average 2,049 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Thornfield Elementary School is well below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Missouri has 228 active non-transient non-community water systems, 7.7% 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 Thornfield Elementary School?
EPA lists Thornfield Elementary School 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. 5 of the 25 active systems in Ozark County (20%) are also owned by a local government.
Does Thornfield Elementary School have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in June 2017. The violations listed here began between March 2008 and June 2017. By type: 8 monitoring and reporting, 2 public notice, recordkeeping or other, 1 monitoring and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (8 of them). EPA lists 12 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 |
|---|---|---|---|---|
| 2017-06-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-12-31 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2016-02-24 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2016-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2015-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-04-19 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2013-12-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2013-03-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2012-12-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2012-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2009-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2008-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
The 12 most recent 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.
Thornfield Elementary School: frequently asked questions
Who runs Thornfield Elementary School?
Thornfield Elementary School (PWSID MO5171205) is a non-transient non-community water system owned by a local government. It is regulated by the MO state drinking water program.
How many people does Thornfield Elementary School serve?
Thornfield Elementary School reports serving 85 people through 1 service connection in Ozark County, Missouri.
Where does Thornfield Elementary School 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 Thornfield Elementary School have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in June 2017. 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 Thornfield Elementary School'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. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in June 2017. For current results, consult EPA ECHO, or the MO state drinking water program.
Where can I find Thornfield Elementary School's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Thornfield Elementary School is a non-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 Ozark County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Gainesville Pws | Ozark | 742 | Community | Groundwater |
| Cloud 9 Ranch Club Inc. | Ozark | 485 | Non-transient non-community | Groundwater |
| Dora R Iii Schools | Ozark | 421 | Non-transient non-community | Groundwater |
| Usace Pontiac Boat Dock Inc. | Ozark | 400 | Transient non-community | Groundwater |
| Rainbow Trout & Game Ranch | Ozark | 331 | Non-transient non-community | Groundwater |
| Bakersfield Pws | Ozark | 303 | 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, “Thornfield Elementary School, PWSID MO5171205, Missouri”, https://aquacensus.com/water-systems/missouri/thornfield-elementary-school-mo5171205 (data as of October 1, 2026).