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Stanton Wastewater Treatment Plant (Stanton, Montcalm County)

EGLE Site Lead: Kevin Wojciechowski, WojciechowskiK@Michigan.gov, 586-623-2948. Content last updated on July 11, 2022.

Background

The Stanton Wastewater Treatment Plant (WWTP), located on Brown Road, discharges treated wastewater to the groundwater under a state Groundwater Discharge Permit issued to the city of Stanton. Treatment consists of five treatment lagoons. The final effluent is discharged to the groundwater via two rapid infiltration basins.

As part of a statewide sampling effort in Fall 2021, EGLE sampled the influent, effluent, and three groundwater monitoring wells for PFAS at the WWTP.

Estimated groundwater flow across the rapid infiltration basins is to the west/southwest.

Map of Stanton Wastewater Treatment Plant Sampling Results

Recent Accomplishments

  • On October 25, 2021, as part of a statewide PFAS sampling effort, EGLE contractors sampled the influent, effluent, and three groundwater monitoring wells at the WWTP.
  • On December 7, 2021, EGLE received the October 2021 sample results. All three monitoring wells exceeded the groundwater cleanup criteria for PFOA. The highest result was 21.1 ppt for PFOA. One of the three monitoring wells also exceeded the criteria for PFOS and PFNA. The highest results were 33.5 ppt PFOS and 7.18 ppt PFNA.

Next Steps

  • EGLE will continue to work with the city of Stanton to determine the extent of PFAS contamination in groundwater on-site as well as identify and reduce, or eliminate potential sources of PFAS to the WWTP.
  • EGLE, MDHHS, and the Mid-Michigan District Health Department are working to identify nearby residential wells and determine if sampling for PFAS is needed.

Residential Well Sampling / Alternative Water Information

  • EGLE, the Michigan Department of Health and Human Services (MDHHS), and the Mid-Michigan District Health Department are working to identify nearby residential wells and determine if sampling for PFAS is needed.

Upcoming Community Engagement

  • None scheduled 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 2021

3

3

* 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.