Public water system · MI0001397
ActiveChestnut Hills
At a glance
Chestnut Hills (PWSID MI0001397) is an active community water system in Washtenaw County, Michigan. It reports serving 813 people through 325 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list one violation for this system; it is not health-based, and the most recent began in April 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
813
Service connections
325
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Chestnut Hills compare with other water systems in Washtenaw County?
By EPA's size categories, Chestnut Hills is a small system (501 to 3,300 people). Washtenaw County has 262 active public water systems. Its population served is about 29% below the county average of 1,147 people per system, and accounts for 0.3% of the 300,406 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 Chestnut Hills 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. 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 Chestnut Hills?
EPA lists Chestnut Hills as privately owned. 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. 229 of the 262 active systems in Washtenaw County (87%) are also privately owned.
Does Chestnut Hills have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in April 2024. By type: 1 monitoring and reporting. The contaminant or rule involved is Combined Uranium. EPA lists 1 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 |
|---|---|---|---|---|
| 2024-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Uraniumcode 4006 | No | Resolved |
The one violation in EPA's records.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.
Chestnut Hills: frequently asked questions
Who runs Chestnut Hills?
Chestnut Hills (PWSID MI0001397) is a community water system privately owned. It is regulated by the MI state drinking water program.
How many people does Chestnut Hills serve?
Chestnut Hills reports serving 813 people through 325 service connections in Washtenaw County, Michigan.
Where does Chestnut Hills 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 Chestnut Hills have any drinking water violations?
EPA's records list one violation for this system; it is not 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 Chestnut Hills' 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 one violation for this system; it is not health-based, and the most recent began in April 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.
Where can I find Chestnut Hills' water quality report?
As a community water system, Chestnut Hills 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 Washtenaw County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Ann Arbor | Washtenaw | 123,851 | Community | Surface water |
| Ypsilanti Community Utility Authority | Washtenaw | 53,988 | Community | Purchased surface water |
| Pittsfield Township | Washtenaw | 24,500 | Community | Purchased surface water |
| Saline | Washtenaw | 9,158 | Community | Groundwater |
| Scio Township | Washtenaw | 8,500 | Community | Purchased surface water |
| Milan | Washtenaw | 7,363 | 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, “Chestnut Hills, PWSID MI0001397, Michigan”, https://aquacensus.com/water-systems/michigan/chestnut-hills-mi0001397 (data as of October 1, 2026).