Public water system · MI0003170
ActiveHillsdale
At a glance
Hillsdale (PWSID MI0003170) is an active community water system in Hillsdale County, Michigan. It reports serving 8,163 people through 4,016 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in April 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
8,163
Service connections
4,016
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Hillsdale compare with other water systems in Hillsdale County?
By EPA's size categories, Hillsdale is a medium system (3,301 to 10,000 people). Hillsdale County has 90 active public water systems, and Hillsdale is the largest of them by population served. Its population served is about 25 times the county average of 325 people per system, and accounts for 28% of the 29,262 people reported by systems filed under the county. Across Michigan, the 10,599 active systems average 847 people each. Nationally, the average active community water system reports serving 6,703 people, so Hillsdale is about 22% above 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. Michigan has 1,332 active community water systems, 13% of the state's 10,599 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 10,214 Michigan systems (96%) list groundwater as their primary source.
Who owns and regulates Hillsdale?
EPA lists Hillsdale as owned by a local government. The MI state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 6 of the 90 active systems in Hillsdale County (6.7%) are also owned by a local government.
Does Hillsdale have drinking water violations?
EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in April 2022. The violations listed here began between July 2001 and April 2022. By type: 4 monitoring and reporting, 2 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (3 of them). EPA lists 7 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 |
|---|---|---|---|---|
| 2022-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2022-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2022-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2017-11-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2017-11-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2014-07-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
All 7 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.
Hillsdale: frequently asked questions
Who runs Hillsdale?
Hillsdale (PWSID MI0003170) is a community water system owned by a local government. It is regulated by the MI state drinking water program.
How many people does Hillsdale serve?
Hillsdale reports serving 8,163 people through 4,016 service connections in Hillsdale County, Michigan.
Where does Hillsdale 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 Hillsdale have any drinking water violations?
EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in April 2022. 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 Hillsdale'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 7 violations for this system; 2 are health-based, and the most recent began in April 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.
Where can I find Hillsdale's water quality report?
As a community water system, Hillsdale 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 Hillsdale County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Jonesville | Hillsdale | 2,258 | Community | Groundwater |
| Litchfield | Hillsdale | 1,310 | Community | Groundwater |
| Reading | Hillsdale | 1,078 | Community | Groundwater |
| Hillsdale American Legion #53 | Hillsdale | 780 | Transient non-community | Groundwater |
| Michindoh Conference Center | Hillsdale | 779 | Community | Groundwater |
| Somerset Bch Cpg /West Campgrd | Hillsdale | 680 | 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, “Hillsdale, PWSID MI0003170, Michigan”, https://aquacensus.com/water-systems/michigan/hillsdale-mi0003170 (data as of October 1, 2026).