Public water system · MO6122199
ActiveOnondaga Cave
At a glance
Onondaga Cave (PWSID MO6122199) is an active transient non-community water system in Crawford County, Missouri. It reports serving 50 people through 62 service connections. Its primary water source is groundwater, and EPA lists it as owned by a state government. EPA's records list 5 violations for this system; 2 are health-based, and the most recent began in November 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
50
Service connections
62
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Onondaga Cave compare with other water systems in Crawford County?
By EPA's size categories, Onondaga Cave is a very small system (500 people or fewer). Crawford County has 36 active public water systems. Its population served is well below the county average of 341 people per system, and accounts for 0.4% of the 12,278 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 Onondaga Cave is about 65% 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 Onondaga Cave?
EPA lists Onondaga Cave as owned by a state 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. 2 of the 36 active systems in Crawford County (5.6%) are also owned by a state government.
Does Onondaga Cave have drinking water violations?
EPA's records list 5 violations for this system; 2 are health-based, and the most recent began in November 2025. The violations listed here began between June 1993 and November 2025. By type: 2 contaminant level above the legal limit, 2 monitoring and reporting and 1 monitoring. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 4 as archived and 1 as resolved. 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. 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 |
|---|---|---|---|---|
| 2025-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 1999-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1997-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1994-12-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1993-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 5 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.
Onondaga Cave: frequently asked questions
Who runs Onondaga Cave?
Onondaga Cave (PWSID MO6122199) is a transient non-community water system owned by a state government. It is regulated by the MO state drinking water program.
How many people does Onondaga Cave serve?
Onondaga Cave reports serving 50 people through 62 service connections in Crawford County, Missouri.
Where does Onondaga Cave 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 Onondaga Cave have any drinking water violations?
EPA's records list 5 violations for this system; 2 are health-based, and the most recent began in November 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 Onondaga Cave'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 5 violations for this system; 2 are health-based, and the most recent began in November 2025. For current results, consult EPA ECHO, or the MO state drinking water program.
Where can I find Onondaga Cave's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Onondaga Cave 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 Crawford County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Cuba Pws | Crawford | 3,292 | Community | Groundwater |
| Indian Hills Utilities Operating Company | Crawford | 1,600 | Community | Groundwater |
| Bourbon Pws | Crawford | 1,524 | Community | Groundwater |
| Steelville Pws | Crawford | 1,435 | Community | Groundwater |
| Dream Blue Springs LLC | Crawford | 500 | Transient non-community | Groundwater |
| Leasburg Pws | Crawford | 350 | 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, “Onondaga Cave, PWSID MO6122199, Missouri”, https://aquacensus.com/water-systems/missouri/onondaga-cave-mo6122199 (data as of October 1, 2026).