PFAS Sampling Results

Surface Water-Sourced Community Drinking Water Systems

Sampling and analyses for community drinking water systems where raw water is supplied by surface waters has been completed by BOW staff. The results are presented as follows:

Some Observations:

  • 44 Community Drinking Water Systems sampled by SCDHEC
  • 10 Community Drinking Water Systems provided data to SCDHEC
  • Accounted for approximately 3.3 million of the approximate 4 million users of Community Water Systems (approximately 82%)
  • USEPA Lifetime Drinking Water Health Advisory for PFOA and PFOS – 70 nanograms per liter (parts per trillion)
  • Number of Exceedances of the USEPA Lifetime Drinking Water Health Advisory – zero (0)
  • Maximum PFOA Concentration Measured – 18 ng/L
  • Maximum PFOS Concentration Measured – 16 ng/L
  • Maximum Combined PFOA and PFOS Measured – 32 ng/L

Groundwater Supplements to Surface Water-Sourced Community Drinking Water Systems 

Sampling and analyses for community drinking water systems where groundwater is also used as a source of raw water is underway by BOW staff.  Results reported thus far are presented as follows:

Some Observations as of February 1, 2021:

  • 47 groundwater wells serving six (6) Community Drinking Water Systems were sampled by SCDHEC
  • Accounted for an approximately 132,000 users, additional to those accounted for previously in the surface water-sourced analyses
  • Increased coverage of approximately 4 million users of community drinking water systems to about 3.4 million (86%)
  • USEPA Lifetime Drinking Water Health Advisory for PFOA and PFOS – 70 nanograms per liter (parts per trillion)
  • Number of Exceedances of the USEPA Lifetime Drinking Water Health Advisory – zero (0)
  • Maximum PFOA Concentration Measured – 12 ng/L
  • Maximum PFOS Concentration Measured – 22 ng/L
  • Maximum Combined PFOA and PFOS Measured – 26 ng/L

Continuing Work:

  • SCDHEC sampling of surface water-sourced Community Drinking Water Systems supplemented by groundwater
  • SCDHEC sampling of Community Drinking Water Systems supplied only by groundwater has begun
  • BOW intends to issue a strategy to assess PFAS from an ambient surface waters perspective, including fish tissue, no later than March 31, 2021.

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*Page last updated 2/05/2021 at 4:39 PM.