Please contact the Site Lead for the most up-to-date status of this site.
These plants receive residential, commercial, and sometimes industrial wastewater that may contain PFAS. Conventional wastewater treatment plants are not designed to treat for PFAS, therefore PFAS may pass through the treatment system to surface waters (i.e., lakes, rivers, etc.) and groundwater. EGLE is actively working with these wastewater treatment plants to address PFAS.
For more information, please see the Wastewater Workgroup page.
Sydney Ruhala, RuhalaS@Michigan.gov or 517-599-5356.
The Middleville Wastewater Treatment Plant (WWTP), located at 607 Sheridan Street, discharges treated wastewater to the groundwater under a state Groundwater Discharge Permit issued to the village of Middleville. The treatment system consists of sequencing batch reactors, a chemical feed system, and a polishing pond. The final treated effluent is discharged to the groundwater on-site via rapid infiltration basins. The Middleville WWTP also has an approved Industrial Pretreatment Program (IPP), which requires industrial dischargers that send their wastewater to the WWTP, to use treatment techniques and management practices to reduce or eliminate the discharge of harmful pollutants to the sanitary sewers. The IPP is designed to protect the municipal WWTP and the environment.
As part of a statewide sampling effort, EGLE sampled the WWTP's influent, effluent, final treated solids, and three groundwater monitoring wells for PFAS in the Fall of 2021.
Estimated groundwater flow direction across the WWTP property is to the southwest.
Content posted October 2022
See an aerial view of the heat map of the site.
See an aerial view of the location of the site.
The three public water supply wells for the village of Middleville were initially sampled in April 2018. Two of the wells were non-detect for PFAS, while PFAS was detected in one of the wells at low concentrations below drinking water criteria. EGLE, MDHHS, and the Barry-Eaton District Health Department will expand residential well sampling if determined to be necessary.
EGLE will continue to work with the village of Middleville to determine the extent of PFAS contamination in groundwater at the WWTP. EGLE will continue to work with the village of Middleville to determine potential sources of PFAS to the WWTP and implement source reduction controls under their IPP. EGLE, MDHHS, and the Barry-Eaton District Health Department will expand residential well sampling if determined to be necessary.
| Type of Sample | Date Sampled (or range) |
Number of Sample Results Received |
Number of Samples above Criteria* |
|---|---|---|---|
| Residential Wells | September 2022 | 15 | 0 |
| Groundwater Monitoring Wells | October 19, 2021 | 3 | 1 |
*Residential well and groundwater monitoring well results are compared to EGLE Part 201 criteria for 7 PFAS compounds effective 12/21/2020: PFOS (16 ppt), PFOA (8 ppt), PFNA (6 ppt), PFHxS (51 ppt), PFHxA (400,000 ppt), PFBS (420 ppt), and HFPO-DA (370 ppt).
