Public water system · MO3190087
ActiveMari Osa Delta
At a glance
Mari Osa Delta (PWSID MO3190087) is an active transient non-community water system in Osage County, Missouri. It reports serving 30 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
30
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Mari Osa Delta compare with other water systems in Osage County?
By EPA's size categories, Mari Osa Delta is a very small system (500 people or fewer). Osage County has 13 active public water systems. Its population served is well below the county average of 633 people per system, and accounts for 0.4% of the 8,225 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 Mari Osa Delta 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 Mari Osa Delta?
EPA lists Mari Osa Delta 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. 4 of the 13 active systems in Osage County (31%) are also privately owned.
Does Mari Osa Delta have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2024. The violations listed here began between November 1996 and April 2024. By type: 9 monitoring and reporting, 2 monitoring and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (8 of them). EPA lists 11 as resolved and 1 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. 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 |
|---|---|---|---|---|
| 2024-04-27 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Unaddressed |
| 2023-03-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2019-09-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2015-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2011-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2011-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2002-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1998-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitrate-Nitritecode 1038 | No | Resolved |
| 1996-11-01 | 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.
Mari Osa Delta: frequently asked questions
Who runs Mari Osa Delta?
Mari Osa Delta (PWSID MO3190087) is a transient non-community water system privately owned. It is regulated by the MO state drinking water program.
How many people does Mari Osa Delta serve?
Mari Osa Delta reports serving 30 people through 1 service connection in Osage County, Missouri.
Where does Mari Osa Delta 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 Mari Osa Delta have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2024. 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 Mari Osa Delta'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, none is health-based, and the most recent began in April 2024. For current results, consult EPA ECHO, or the MO state drinking water program.
Where can I find Mari Osa Delta's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Mari Osa Delta 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 Osage County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Osage County Pwsd 3 | Osage | 2,800 | Community | Groundwater |
| Linn Pws | Osage | 1,500 | Community | Groundwater |
| Osage Co Pwsd 1 | Osage | 1,221 | Community | Groundwater |
| Osage County Pwsd 2 North | Osage | 705 | Community | Groundwater |
| Osage County Pwsd 2 South | Osage | 468 | Community | Groundwater |
| Freeburg Pws | Osage | 450 | 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, “Mari Osa Delta, PWSID MO3190087, Missouri”, https://aquacensus.com/water-systems/missouri/mari-osa-delta-mo3190087 (data as of October 1, 2026).