Public water system · OH3200411
ActiveNorthwestern W and Sd - Mccomb
At a glance
Northwestern W and Sd - Mccomb (PWSID OH3200411) is an active community water system in Hancock County, Ohio. It reports serving 1,527 people through 626 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in December 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,527
Service connections
626
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Northwestern W and Sd - Mccomb compare with other water systems in Hancock County?
By EPA's size categories, Northwestern W and Sd - Mccomb is a small system (501 to 3,300 people). Hancock County has 37 active public water systems, and Northwestern W and Sd - Mccomb is the 3rd-largest of them by population served. Its population served is about 16% below the county average of 1,810 people per system, and accounts for 2.3% of the 66,986 people reported by systems filed under the county. Across Ohio, the 3,854 active systems average 2,767 people each. Nationally, the average active community water system reports serving 6,703 people, so Northwestern W and Sd - Mccomb is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Ohio has 1,028 active community water systems, 27% of the state's 3,854 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 191 Ohio systems (5%) list purchased surface water as their primary source.
Who owns and regulates Northwestern W and Sd - Mccomb?
EPA lists Northwestern W and Sd - Mccomb as owned by a local government. 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. 7 of the 37 active systems in Hancock County (19%) are also owned by a local government.
Does Northwestern W and Sd - Mccomb have drinking water violations?
Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in December 2025. The violations listed here began between January 2014 and December 2025. By type: 8 contaminant level above the legal limit, 2 public notice, recordkeeping or other, 1 monitoring and reporting and 1 required treatment not met. The contaminant or rule involved most often is Haloacetic acids (HAA5) (7 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 |
|---|---|---|---|---|
| 2025-12-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Unaddressed |
| 2024-07-31 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2024-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2023-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2023-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2023-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2023-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2022-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2022-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2019-01-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2015-08-01 | Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2014-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | 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.
Northwestern W and Sd - Mccomb: frequently asked questions
Who runs Northwestern W and Sd - Mccomb?
Northwestern W and Sd - Mccomb (PWSID OH3200411) is a community water system owned by a local government. It is regulated by the OH state drinking water program.
How many people does Northwestern W and Sd - Mccomb serve?
Northwestern W and Sd - Mccomb reports serving 1,527 people through 626 service connections in Hancock County, Ohio.
Where does Northwestern W and Sd - Mccomb get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Northwestern W and Sd - Mccomb have any drinking water violations?
Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in December 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 Northwestern W and Sd - Mccomb'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, 9 are health-based, and the most recent began in December 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the OH state drinking water program.
Where can I find Northwestern W and Sd - Mccomb's water quality report?
As a community water system, Northwestern W and Sd - Mccomb must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Hancock County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Findlay City Pws | Hancock | 54,040 | Community | Surface water |
| Odot Rest Area 1-25 Nb | Hancock | 2,000 | Transient non-community | Groundwater |
| Odot Rest Area 1-26 Sb | Hancock | 1,500 | Transient non-community | Groundwater |
| Arlington Village Pws | Hancock | 1,474 | Community | Groundwater |
| Riverdale Local Schools | Hancock | 1,106 | Non-transient non-community | Groundwater |
| Cory Rawson Schools | Hancock | 595 | Non-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, “Northwestern W and Sd - Mccomb, PWSID OH3200411, Ohio”, https://aquacensus.com/water-systems/ohio/northwestern-w-and-sd-mccomb-oh3200411 (data as of October 1, 2026).