Public Water Supply Testing Results Prior to Statewide Sampling Initiative

Understanding the Sample Results

Definitions of the information provided in the sampling results tables:

  • Population Served: The number of individuals served by the water supply.
  • Sample Date: The date samples were taken at the water supply.
  • Sample Number: The identification number that corresponds to the sample taken.
  • Raw Water or Treated Drinking Water: The location where the water sample was collected. If the table shows “Raw Water” the sample was taken directly from the well or water source. If the table shows “Treated Drinking Water” the sample was taken after the water passed through treatment system(s) the water supply has in place.
  • PFOA + PFOS (ppt): The amount of PFOA and PFOS added together.
  • Total Tested PFAS (ppt): The amount of all PFAS chemicals that were tested added together.
    • PFAS are measured in ng/L (ng/L=parts per trillion [ppt]).
    • If the results listed is “ND” the lab did not detect, or find, that PFAS was in the water sample.
    • A Method Detection Limit (MDL) is the smallest amount that can be reliably measured by the laboratory equipment. If the amount found in the water sample was below the MDL and was estimated, number is followed by a “J.”
    • If the lab did not detect, or find, that PFAS in the water sample, a “U” may show. This means the PFAS was not in the sample or the amount was so low the lab could not measure it.
    • Results are provided in parts per trillion. A part per trillion (ppt) is:
      • 1 nanogram per liter (ng/L)
      • The equivalent of 1 drop of water in 20 Olympic-size swimming pools
  • Data Collected by: Organization that collected the water sample. If a water supply has collected its own sample, the column will show its name. This is only for results from samples taken prior to the statewide initiative.
    • The MDEQ will be collecting samples from all locations to ensure the data is consistent, the same method detection limits are used, and testing is for the same PFAS chemicals. 
  • Method: The laboratory method used for analyzing the samples. For more information, please visit the Frequently Asked PFAS Questions Page.

For support in communicating results to your customers, please visit our Toolkit for documents to assist in your outreach.

 
Public Water Supply Population Served Sampling     Date*   (*indicates not tested by DEQ)  Raw Water or Treated Drinking Water? PFOA + PFOS (ppt) Total Tested PFAS (ppt) Data Collected By Method
Ira Township 11,112 1/17/2018 Treated Drinking Water 3.280J 4.365J DEQ Isotope Dilution
Ira Township 11,112 1/17/2018 Raw Water 0.666J 2.323J DEQ Isotope Dilution
Mount Clemens Municipal Water Supply, City of 18,405 1/17/2018 Treated Drinking Water 0.930J 2.710J DEQ Isotope Dilution
Mount Clemens Municipal Water Supply, City of 18,405 1/17/2018 Raw Water 2.527J 4.250J DEQ Isotope Dilution
New Baltimore 12,720 1/17/2018 Treated Drinking Water 2.533J 4.764J DEQ Isotope Dilution
New Baltimore 12,720 1/17/2018 Raw Water 2.588J 3.157J DEQ Isotope Dilution
Saginaw-Midland Municipal Supply Corporation 339,247 12/7/2017 Raw Water 2.310J 3.05J DEQ Isotope Dilution
Saginaw-Midland Municipal Supply Corporation 339,247 12/7/2017 Raw Water 2.700J 2.400J DEQ Isotope Dilution
Saginaw-Midland Municipal Supply Corporation 339,247 12/7/2017 Raw Water 2.740J 2.629J DEQ Isotope Dilution
Saginaw-Midland Municipal Supply Corporation 339,247 1/11/2018 Raw Water 0.758J 1.624J DEQ Isotope Dilution
Saginaw-Midland Municipal Supply Corporation 339,247 1/11/2018 Raw Water 1.437J 2.660J DEQ Isotope Dilution
Saginaw-Midland Municipal Supply Corporation 339,247 1/11/2018 Raw Water 0.545J 0.724J DEQ Isotope Dilution
Ann Arbor Municipal Supply 118,017 1/9/2018* Raw Water 8.800 n/a Ann Arbor EPA Method 537 Rev. 1.1
Ann Arbor Municipal Supply 118,017 1/9/2018* Treated Drinking Water 3.500J n/a Ann Arbor EPA Method 537 Rev. 1.1
Huron Shore Regional Utility Authority 14,369 10/12/2016* Raw Water 5.100 3.200J HSRUA Isotope Dilution
Huron Shore Regional Utility Authority 14,369 10/12/2016* Treated Drinking Water 3.400 4.200 HSRUA Isotope Dilution
Plainfield Township Municipal Supply 40,891 11/27/2017* Raw Water 6.600 9.200U Plainfield Township EPA Method 537 Rev. 1.1
Plainfield Township Municipal Supply 40,891 2/26/18* Treated Drinking Water 6.500 11.600 Plainfield Township EPA Method 537 Rev. 1.1
Grayling Municipal Well #1 1,837 9/7/2017 Raw Water ND 15.652J DEQ Isotope Dilution
Grayling Municipal Well #2 1,837 9/7/2017 Raw Water ND ND DEQ Isotope Dilution
Marine City 7,852 3/8/2018 Treated Drinking Water 2.318J 5.654J DEQ Isotope Dilution
Marine City 7,852 3/8/2018 Raw Water 2.589J 4.669J DEQ Isotope Dilution
Marine City 7,852 3/8/2018 Treated Drinking Water 1.960J 3.500J DEQ EPA Method 537 Rev. 1.1
Algonac 13,976 3/8/2018 Treated Drinking Water 2.700J 5.937J DEQ Isotope Dilution
Algonac 13,976 3/8/2018 Raw Water 2.845J 2.910J DEQ Isotope Dilution
Algonac 13,976 3/8/2018 Treated Drinking Water 3.36J 3.554J DEQ EPA Method 537 Rev. 1.1
Marysville 9,959 3/8/2018 Treated Drinking Water 2.310J 4.125J DEQ Isotope Dilution
Marysville 9,959 3/8/2018 Raw Water 1.896J 2.699J DEQ Isotope Dilution
Marysville 9,959 3/8/2018 Treated Drinking Water 1.560J 2.909J DEQ EPA Method 537 Rev. 1.1
St. Clair 8,755 3/8/2018 Treated Drinking Water 3.240J 7.224 DEQ Isotope Dilution
St. Clair 8,755 3/8/2018 Raw Water 1.930J 4.788J DEQ Isotope Dilution
St. Clair 8,755 3/8/2018 Treated Drinking Water 2.800J 4.081 DEQ EPA Method 537 Rev. 1.1
St. Clair Water & Sewer Authority 4,200 3/8/2018 Treated Drinking Water 2.287J 4.020J DEQ Isotope Dilution
St. Clair Water & Sewer Authority 4,200 3/8/2018 Raw Water 2.759J 7.27J DEQ Isotope Dilution
St. Clair Water & Sewer Authority 4,200 3/8/2018 Treated Drinking Water 1.920J 3.490J DEQ EPA Method 537 Rev. 1.1
Port Huron 61,470 3/8/2018 Treated Drinking Water 1.862J 3.499J DEQ Isotope Dilution
Port Huron 61,470 3/8/2018 Raw Water 2.533J 3.535J DEQ Isotope Dilution
Port Huron 61,470 3/8/2018 Treated Drinking Water 1.870J 2.142J DEQ EPA Method 537 Rev. 1.1