Kent County, Wyoming, BASF Corporation - Inmont Division

Updated: July 17, 2020

BackgroundBASF Corporation Inmont Division Preliminary PFAS Investigation Map

This site is located at 836 Chicago Drive, SW and is the site of a former manufacturer of furniture varnish, paint, and container coatings. The city of Wyoming tested wastewater coming from the facility as part of the Industrial Pretreatment Program (IPP); the results showed elevated PFAS levels. Since the source of tested wastewater was a groundwater treatment system, EGLE requested BASF Corporation to develop a workplan to assess the extent of PFAS in the groundwater.

Recent Accomplishments

  • On June 10, 2020, EGLE was provided the 2019 groundwater treatment system performance monitoring report.
  • On June 22, 2020, EGLE was provided with a summary of the results for the March 2020 groundwater sampling event; 21 wells were sampled and analyzed for PFAS. Results are reflected on the sampling chart.
  • On June 22, 2020, EGLE participated in a conference call meeting to discuss the findings of the spring sampling event and next steps

Next Steps

  • BASF will continue to investigate PFAS at the facility in accordance with Michigan’s environmental law.
  • BASF continues to work on a design modification for the treatment of groundwater that will remove PFAS chemicals and other contaminants in the groundwater pumped from the facility prior to discharge into the municipal sanitary sewer system.  The city of Wyoming and EGLE are overseeing these efforts.
  • The next groundwater sampling event is scheduled for June - July 2020.

Residential Well Testing/Alternate Water Information

  • Surrounding residents/businesses are on municipal water from the City of Wyoming. There are no known drinking water wells in the current investigation area.
  • EGLE has tested all municipal water supplies for PFAS. View the results for the city of Wyoming.

Upcoming Community Engagement

  • None scheduled at this time.
Sampling: PFOS and PFOA Only

Type of Sample

Date Sampled

# of Samples

# of Results Received

# of Non-detects

# Between Non-detect and standard*

# > Standard

Groundwater Effluent

May 8 - Nov 2019 4 4 0 1 3
Groundwater Influent and Monitoring Wells Sep 2019 - Mar 2019 38 38 0 11 27


  42 42 0 12 30


*Groundwater results are compared to EGLE Part 201 Criteria of 70 ppt PFOS+PFOA.

Sampling Notes

  • Other PFAS analytes were detected in samples. There are no federal or state standards for these analytes.
  • Samples collected in September and November 2019 were only analyzed for PFOA and PFAS.

Historical Timeline

The BASF Corporation (BASF) facility has been industrial since the late-1800s, with uses including the manufacturing/application of furniture finishes and paint. BASF stopped operations at the plant in 1987 to begin manufacturing automotive paint and container coatings; these operations stopped in 1999. An environmental investigation was conducted at the site in 1988 after it was discovered there were leaks from piping and storage tanks. A groundwater pump-and-treat system was installed later in 1993 to clean up many contaminants other than PFAS in the groundwater at the site. The treatment system discharges the treated water into the city of Wyoming’s sanitary sewer system for final treatment and eventual release to the Grand River.

On May 7-9, 2018, the city of Wyoming conducted an initial round of testing of wastewater coming into their water treatment plant from locations that held Industrial Pretreatment Permits, such as BASF. A second round of wastewater samples was collected from the facility on August 14, 2018.  Results from these sampling events showed elevated PFAS levels in the wastewater coming from BASF. Given the facility’s history and the fact that the only wastewater generated at the BASF facility was derived from groundwater extraction wells installed on-site, EGLE requested BASF develop a workplan to assess the presence of PFAS in the groundwater. BASF presented this workplan to EGLE on April 3, 2019, which included groundwater treatment system effluent sample results, which confirmed PFAS in the wastewater and most likely in the groundwater as well. 

The groundwater treatment system gathers groundwater from a total of 14 environmental remediation extraction wells from across the site including 11 from the former plant area and 3 from a former storage tank area. The site is in an industrial area immediately adjacent to Plaster Creek. The Grand River is about 1.2 miles downgradient from the site. Groundwater flow is to the north-northeast, paralleling and discharging to Plaster Creek. However, the groundwater treatment system has been working since 1993, so groundwater flow is generally towards the extraction wells on-site. The extent of PFAS contamination has not yet been determined.  BASF is also working to engineer a change from a biological treatment system--which treats another contaminant--to a granular activated carbon (GAC) system which will treat both the other contaminant and PFAS.

  • On May 21, 2018, BASF’s consultant collected a single sample of the groundwater treatment system’s effluent from the sample spigot to test for PFAS.
  • On April 3, 2019, EGLE received the results from the May 21, 2018 groundwater treatment system effluent sampling from BASF in a workplan from the facility. The results were 517 ppt PFOS and 30.6 ppt PFOA.
  • On November 7-9, 2019, groundwater samples were collected from monitoring wells at the facility.
  • On January 8, 2020, EGLE was provided a report summarizing the data collected in November 2019.  Sample data is reflected on the sampling chart.
  • On February 7, 2020, BASF submitted a First Quarter 2020 sampling work plan which included additional groundwater monitoring wells and EGLE provided feedback on the work plan.