Public water system · MI0005020
ActiveOnsted
Community water system in Lenawee County, Michigan, drawing primarily on groundwater.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
907
Service connections
365
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
Violations & enforcement
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2026-01-24 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Unaddressed |
| 2026-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2025-12-11 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2024-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2024-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 2019-08-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2019-08-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2011-11-01 | 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 |
All 10 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.
Onsted: frequently asked questions
Is Onsted's water safe to drink?
Onsted is an active community water system regulated under the Safe Drinking Water Act, overseen by the MI state drinking water program. EPA's SDWA data records violations for this system — the most recent are listed on this page; consult EPA ECHO or your annual Consumer Confidence Report for its current compliance status.
Who runs Onsted?
Onsted (PWSID MI0005020) is a local government-owned community water system, regulated by the MI state drinking water program.
How many people does Onsted serve?
Onsted reports serving 907 people through 365 service connections in Lenawee County, Michigan.
Where does Onsted get its water?
EPA SDWIS lists this system's primary water source as groundwater.
Other water systems in Lenawee County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Adrian | Lenawee | 23,663 | Community | Surface water |
| Tecumseh | Lenawee | 8,521 | Community | Groundwater |
| The Groves of Michigan | Lenawee | 6,460 | Transient non-community | Groundwater |
| Madison Township | Lenawee | 3,480 | Community | Groundwater |
| Blissfield | Lenawee | 3,276 | Community | Surface water |
| Clinton | Lenawee | 2,336 | Community | Groundwater |
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