Public water system · IL3158436
ActiveTharps Subway Oquawka
At a glance
Tharps Subway Oquawka (PWSID IL3158436) is an active transient non-community water system in Henderson County, Illinois. It reports serving 125 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 9 violations for this system; none is health-based, and the most recent began in July 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
125
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Tharps Subway Oquawka compare with other water systems in Henderson County?
By EPA's size categories, Tharps Subway Oquawka is a very small system (500 people or fewer). Henderson County has 26 active public water systems. Its population served is well below the county average of 390 people per system, and accounts for 1.2% of the 10,150 people reported by systems filed under the county. Across Illinois, the 3,872 active systems average 3,204 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Tharps Subway Oquawka is about 13% 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. Illinois has 1,703 active transient non-community water systems, 44% of the state's 3,872 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,808 Illinois systems (73%) list groundwater as their primary source.
Who owns and regulates Tharps Subway Oquawka?
EPA lists Tharps Subway Oquawka as privately owned. The IL state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 15 of the 26 active systems in Henderson County (58%) are also privately owned.
Does Tharps Subway Oquawka have drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in July 2021. The violations listed here began between October 2017 and July 2021. By type: 9 monitoring and reporting. The contaminant or rule involved most often is Nitrate (9 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 |
|---|---|---|---|---|
| 2021-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2019-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2018-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2018-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2017-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | 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.
Tharps Subway Oquawka: frequently asked questions
Who runs Tharps Subway Oquawka?
Tharps Subway Oquawka (PWSID IL3158436) is a transient non-community water system privately owned. It is regulated by the IL state drinking water program.
How many people does Tharps Subway Oquawka serve?
Tharps Subway Oquawka reports serving 125 people through 1 service connection in Henderson County, Illinois.
Where does Tharps Subway Oquawka 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 Tharps Subway Oquawka have any drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in July 2021. 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 Tharps Subway Oquawka'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; none is health-based, and the most recent began in July 2021. For current results, consult EPA ECHO, or the IL state drinking water program.
Where can I find Tharps Subway Oquawka's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Tharps Subway Oquawka 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 Henderson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Dallas Rural Water District | Henderson | 6,370 | Community | Groundwater |
| Oquawka | Henderson | 1,125 | Community | Groundwater |
| Stronghurst | Henderson | 838 | Community | Groundwater |
| Gladstone | Henderson | 387 | Community | Groundwater |
| Biggsville | Henderson | 273 | Community | Purchased groundwater |
| Ayerco Convenience Center #17 | Henderson | 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, “Tharps Subway Oquawka, PWSID IL3158436, Illinois”, https://aquacensus.com/water-systems/illinois/tharps-subway-oquawka-il3158436 (data as of October 1, 2026).