GRASS LAKE
Michigan — Community Water System — PWSID: MI0002830
System Information
| PWSID | MI0002830 |
| System Name | GRASS LAKE |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 05 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 3, 1981 |
| Last Reported | Dec 18, 2025 |
Location & Contact
| State | Michigan |
| City | GRASS LAKE |
| ZIP Code | 49240 |
| Address | PO BOX 737 |
| Organization | EDGAR, SABRINA |
| Phone | 517-522-4550 |
Population & Service
| Population Served | 1,986 |
| Service Connections | 485 |
Drinking Water Violations (11)
This water system has 11 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan 1, 2023 | Dec 31, 2023 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2023 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2023 | Dec 31, 2023 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2023 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2023 | Dec 31, 2023 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2023 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2023 | Dec 31, 2023 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2023 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2023 | Dec 31, 2023 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2023 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2023 | Dec 31, 2023 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2023 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2023 | Dec 31, 2023 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2023 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Sep 11, 2022 | — | Revised Total Coliform Rule | RPT | No | No | — | — | — | Resolved | Sep 26, 2022 | Revised Total Coliform Rule |
| Sep 11, 2022 | — | Revised Total Coliform Rule | RPT | No | No | — | — | — | Resolved | Sep 26, 2022 | Revised Total Coliform Rule |
| Sep 11, 2022 | — | Revised Total Coliform Rule | RPT | No | No | — | — | — | Resolved | Sep 26, 2022 | Revised Total Coliform Rule |
| Sep 11, 2022 | — | Revised Total Coliform Rule | RPT | No | No | — | — | — | Resolved | Sep 26, 2022 | Revised Total Coliform Rule |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.