Public water system · OH6258112
ActiveSt Hazards - Middle Bass Island
At a glance
St Hazards - Middle Bass Island (PWSID OH6258112) is an active transient non-community water system in Ottawa County, Ohio. It reports serving 300 people through 88 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 9 violations for this system; 1 is health-based, and the most recent began in September 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
300
Service connections
88
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does St Hazards - Middle Bass Island compare with other water systems in Ottawa County?
By EPA's size categories, St Hazards - Middle Bass Island is a very small system (500 people or fewer). Ottawa County has 36 active public water systems. Its population served is well below the county average of 1,317 people per system, and accounts for 0.6% of the 47,393 people reported by systems filed under the county. Across Ohio, the 3,854 active systems average 2,767 people each. Nationally, the average active transient non-community water system reports serving 144 people, so St Hazards - Middle Bass Island is about twice 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. Ohio has 2,282 active transient non-community water systems, 59% of the state's 3,854 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 3,446 Ohio systems (89%) list groundwater as their primary source.
Who owns and regulates St Hazards - Middle Bass Island?
EPA lists St Hazards - Middle Bass Island as privately owned. The OH state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 28 of the 36 active systems in Ottawa County (78%) are also privately owned.
Does St Hazards - Middle Bass Island have drinking water violations?
EPA's records list 9 violations for this system; 1 is health-based, and the most recent began in September 2025. The violations listed here began between July 2007 and September 2025. By type: 7 monitoring and reporting, 1 required treatment not met and 1 reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (6 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 |
|---|---|---|---|---|
| 2025-09-01 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2024-04-20 | ReportingReport Startup Procedures Cert Form (RTCR) · code 4C | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2010-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2010-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2009-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2009-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2009-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2009-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2007-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | 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.
St Hazards - Middle Bass Island: frequently asked questions
Who runs St Hazards - Middle Bass Island?
St Hazards - Middle Bass Island (PWSID OH6258112) is a transient non-community water system privately owned. It is regulated by the OH state drinking water program.
How many people does St Hazards - Middle Bass Island serve?
St Hazards - Middle Bass Island reports serving 300 people through 88 service connections in Ottawa County, Ohio.
Where does St Hazards - Middle Bass Island 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 St Hazards - Middle Bass Island have any drinking water violations?
EPA's records list 9 violations for this system; 1 is health-based, and the most recent began in September 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 St Hazards - Middle Bass Island'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; 1 is health-based, and the most recent began in September 2025. For current results, consult EPA ECHO, or the OH state drinking water program.
Where can I find St Hazards - Middle Bass Island's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. St Hazards - Middle Bass Island 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 Ottawa County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Ottawa County Regional Water District | Ottawa | 20,428 | Community | Surface water |
| Port Clinton City | Ottawa | 6,500 | Community | Purchased surface water |
| Put-in-Bay Village | Ottawa | 5,000 | Community | Surface water |
| Oak Harbor Village | Ottawa | 4,400 | Community | Purchased surface water |
| Genoa Village | Ottawa | 3,110 | Community | Purchased surface water |
| Carroll Water and Sewer | Ottawa | 2,288 | Community | Surface water |
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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, “St Hazards - Middle Bass Island, PWSID OH6258112, Ohio”, https://aquacensus.com/water-systems/ohio/st-hazards-middle-bass-island-oh6258112 (data as of October 1, 2026).