Skip to main content

Middleville Wastewater Treatment Plant (Middleville, Barry County)

EGLE Site Lead: Sydney Ruhala, RuhalaS@Michigan.gov or 517-599-5356. Content last updated: May 24, 2022.

Background

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.

Middleville wastewater treatment plant map

Recent Accomplishments

  • On October 19, 2021, EGLE contractors sampled the influent, effluent, final treated solids, and three groundwater monitoring wells for PFAS at the Middleville WWTP as part of a statewide sampling effort.
  • On December 1, 2021, EGLE received the sampling results. One of the monitoring wells exceeded groundwater cleanup criteria for PFOS. The highest result was 25.6 ppt PFOS.

Next Steps

  • 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 worked with the village of Middleville to identify nearby residential wells that will be sampled for PFAS. Sampling is anticipated to be done early summer 2022.

Residential Well Sampling / Alternate Water Information

  • EGLE, the Michigan Department of Health and Human Services (MDHHS), and the Barry-Eaton District Health Department worked with the village of Middleville to identify nearby residential wells that will be sampled for PFAS. 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.

Upcoming Community Engagement

  • None at this time.

Sampling Results Summary

 Type of Sample Date Sampled (or range) Number of Sample Results Received Number of Samples above Criteria*
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).

Sampling Notes

  • None at this time.