Grayling Army Airfield, Grayling, Crawford County

Updated: March 14, 2019

PFAS Map Grayling Army AirfieldBackground

Grayling Army Airfield is a 923-acre area owned by the United States Army.

Recent Accomplishments

  • On March 12, 2019 AECOM collected three (3) residential drinking water sample. Results are expected on April 3, 2019.
  • AECOM completed the 2nd round of RI groundwater monitoring on February 8, 2019.

Next Steps

  • MDEQ will continue evaluating Remedial Investigation data and developing final reports summarizing investigation activities.
  • MDEQ will continue to monitor new residential sampling requests, and call residents to set up sampling dates and times.
  • AECOM plans to collect residential well samples on March 12, 2019.

Residential Well Testing/Alternate Water Information (if applicable)

  • 315 households have been provided filters by District Health Department #10.
  • Seven households have been provided filters by District Health Department #10
  • All residential well testing reflected on this report has been conducted by the MDEQ.
  • For additional information on residential well testing and results, visit the Frequently Asked Questions.
  • The MDEQ has sampled all municipal water supplies for PFAS. View the results for the city of Grayling.

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

Drinking Water (Residential, Type I & II) Through
Mar 14, 2019
687 684 452 215 17


Through Mar 14, 2019 356 356 144 191 21


  1,043 1,040 596 406 38

*Groundwater results are compared to the MDEQ Part 201 Criteria of 70 ppt PFOS+PFOA.
*Residential well results are compared to the USEPA Lifetime Health Advisory Level of 70 ppt PFOS+PFOA.

Sampling notes

  • Other PFAS analytes were detected in samples. There are no federal or state standards for these analytes.
  • All sample counts and activities reflect “off-base” sampling efforts only.
  • Sample results in the above table are from MDEQ and Michigan National Guard combined.


The Camp Grayling environmental staff regularly monitor a number of environmental factors at the camp and airfield to ensure safety, compliance with state and federal regulations, and to proactively detect and remedy potential problems. The most recent proactive measure was to test water samples for PFAS. A few of the samples detected PFOA+PFOS at levels above the United States Environmental Protection Agency (USEPA) Lifetime Health Advisory (LHA).

As of the week of March 12. 2019:

687 private wells have been tested for PFOA/PFOS
684 results are in
452 are non-detects
215 PFOA & PFOS detected (0.56 - 15.6 ppt)
17 samples above MDEQ criteria - PFOA+PFOS 70 ppt

PFOA & PFOS were detected in 232 samples – Concentrations range from 0.56 – 694.2

Grayling Army Airfield PFAS Historical Timeline

Grayling Army Airfield is a 923-acre area owned by the United States Army. The area is just outside the northern boundary of Grayling and is surrounded by residential and commercial properties.

  • In May 2017, the MDMVA notified the MDEQ that groundwater samples on the Grayling Army Airfield tested positive for PFOA/PFOS.
  • In June 2017, the MDEQ began testing private residential wells due to the groundwater results from on-base at the Grayling Army Airfield. Private well sampling continues currently as requests come in. Filters have been provided to residents with detections of more than 70 ppt PFOS+PFOA, and ongoing discussions are needed to determine if filters should be provided to additional homes until a long-term solution is identified.
  • In June 2017, two wells were sampled at the Timberly Village Mobile Home Community. Results showed low levels of PFAS.
    • Follow-up samples were collected in August 2017 and results of these samples confirmed the initial sample results.
    • Notification to the approximately 60 residents in 25 mobile homes was provided by the owner.
  • Between Fall 2017 and Winter 2018, the MDEQ collected 43 environmental boring samples.
  • Beginning July 10, 2018, the MDEQ started monitoring well installations, with 73 monitoring wells installed at 20 locations. Currently, data is being evaluated and maps developed to assist in determining next steps. A Technical Report is due in March 2019.
  • On May 29, 2018, the MDEQ hosted a meeting to update local officials on the status of the investigation.
  • On December 11, 2018, the MDEQ hosted a Public Meeting for the community.
  • On December 20, 2018 AECOM collected six residential drinking water samples. Results were received on January 17, 2019.
  • On February 6, 2019 AECOM collected one (1) residential drinking water sample. Results were received on February 21, 2019.
  • AECOM completed the 2nd round of RI groundwater monitoring on February 8, 2019.

Grayling Area PFAS Response

  • Grayling Army Airfield (GAAF), Crawford County

    Camp Grayling - Range 30

    Camp Grayling Map for PA ReportGroundwater samples were recently collected from 12 monitoring wells at MATES/Range 30.  One of those 12 groundwater samples collected at the MATES facility contained a combined concentration of PFOA + PFOS greater than 70 ppt.  In an effort to exercise an abundance of caution, we have identified a new area around MATES from which we would like to collect groundwater samples at residences located within that area.  The Michigan Department of Military Affairs (DMVA) is currently requesting the permission of residents in this immediate area to collect a sample from their drinking water well.  Written permission to sample drinking water must be received and processed before the sample can be collected. Sampling is scheduled to begin the first week of November. We expect analytical results near the end of December. ‚Äč

    Residents who live in this area are encouraged to contact Patti Lyman, Michigan Department of Military and Veterans Affairs, at 517-275-0804 ASAP to schedule a time when we can obtain your written permission and collect the groundwater sample.

    Final Preliminary Assessment Report - Camp Grayling, Michigan
    Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA) Impacted Sites -


Contact Information

  • For assistance, please email the Environmental Assistance Center or call 800-662-9278.

    If you live in the designated area for free water testing, please fill out and send this email form.

    Residents please note:

    Many residents have inquired about which whole house filters are certified to remove PFOS/PFOA. At this time, the DEQ is not aware of any whole house filters currently on the market that are certified to remove PFOS/PFOA by the NSF International.