Thermofil, Green Oaks Township, Livingston County

Updated: September 15, 2020

EGLE Site Lead:
Kim Sakowski

BackgroundThermofil Map

The property was developed in 1955 by Haigh Manufacturing Company as a metal stamping operation. From 1977-1982 the site was occupied by ITT-United Plastics, which molded and painted plastics. Thermofil purchased the facility from ITT in 1982 and operated a custom reinforced plastic compounding business. During process operations, a resin was blended on site with agents such as fiberglass, talc, mica and flame-retardants. This blended material was then transformed into pellets. The plastic creation process included the addition of flame-retardants. PFAS is used during the creation of plastics to keep the plastic from sticking to the mold.  In 1997 a large fire occurred, and plastics stored at the facility burned. It is reported only water was used to control the fire. There are no reports of fire-fighting foam being used.

EGLE has conducted previous investigations at the facility and downgradient within a residential area associated with a trichloroethylene (TCE) groundwater contaminant plume extending approximately 2,000 feet in a southeast direction towards the Huron River watershed.

Recent Accomplishments

  • In September 2020, a new map has been generated showing detections of PFAS in groundwater.

Next Steps

  • EGLE is working closely with the Michigan Department of Health and Human Services (MDHHS) and Livingston County Health Department to verify any private wells in and around the contaminant plume that did not historically connect to a municipal supply. If any wells are found within the investigation area, they will be sampled as soon as possible.
  • EGLE will be conducting the next round of PFAS sampling during Fall 2020.

Residential Well Testing/Alternate Water Information

  • This site is located within Starlight Mobile Home Park’s wellhead protection area. EGLE has tested all municipal water supplies for PFAS. View the results for Starlight Mobile Home Park.
  • The immediate area surrounding the facility is on municipal water supplied by the city of Brighton, however, private wells remaining in the wellhead protection area are outside of the current detection area.

Upcoming Community Engagement

  • None scheduled at this time.

Sampling Notes

  • On August 3, 2020, new Part 201 Criteria went into effect.  Historical sampling data compared to Part 201 Criteria >70 is captured in the historical timeline below.
  • Other PFAS analytes were detected in samples. There are no federal or state standards for these analytes.

Historical Timeline

  • On April 16, 2019, EGLE’s contractor collected 11 groundwater samples from monitoring wells.
  • On May 13, 2019, EGLE received the results. The highest values were 163 ppt PFOS+PFOA and 294 ppt Total Tested PFAS.
  • On August 27 to September 3, 2019 EGLE’s contractor collected 26 groundwater samples from monitoring wells.
  • On October 15, 2019, EGLE received the results. The highest values were 198 ppt PFOS+PFOA and 475 ppt Total Tested PFAS.
  • Sampling: PFOS and PFOA Only

    Type of Sample

    Date Sampled

    # of Samples

    # of Results Received

    # of Non-detects

    # Between Non-detect and standard*

    > Standard


    Apr 2019 - Present 37 37 13 19 5


      37 37 13 19 5


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