From 2020 to 2023, DHEC sampled for PFAS compounds in drinking water at all Community Water Systems in the state. A Community Water System is a public water system that serves at least 15 service connections used by year-round residents or regularly serves at least 25 year-round residents. This may include, but not limited to, subdivisions, municipalities, mobile home parks, and apartments.

We continue to work with water systems throughout the state to provide information, resources and data for how to best address these emerging PFAS contaminants.

Community Drinking Water Systems Using Surface Water

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

• Surface Water Treatment Plant Data

Community Drinking Water Systems Using Groundwater

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

• Groundwater Well Data

PFAS - Shaw Air Force Base

• Please note that data for community water systems impacted by Shaw Air Force Base can be found here.
• This data is not included as part of the PFAS Drinking Water Strategy and therefore is not included in the Groundwater Well Data. 

Some Observations:

Surface Water Plants (56 plants)

Analyte	# Over MCL	Max concentration  (ng/L)
PFOA	13	12
PFOS	24	16
PFNA	0	Non Detect
PFHxS	0	5
HFPO-DA	0	5
Hazard Index	0	0.5

 

Groundwater Wells (352 systems with 870 wells)

Analyte	# Over MCL	Max concentration (ng/L)
PFOA	35	220
PFOS	29	33
PFNA	0	5.4
PFHxS	4	380
HFPO-DA	0	2.8
Hazard Index	3	42

*Page last updated 4/17/2024