One or more PFAS compounds exceed EPA Maximum Contaminant Levels. This is not a current violation — the federal compliance deadline is April 2029 (a proposed extension to 2031 is not final). These are UCMR 5 results from 2023 to 2025; the system may have installed treatment since.
Key contaminants vs MCL
PFOA9.5 ppt(MCL: 4 ppt)
PFOS9.1 ppt(MCL: 4 ppt)
EPA MCL: 4 ppt (parts per trillion) for PFOA and PFOS individually. Compliance deadline: April 26, 2029 under the current rule.
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As printed in the state's own documents. Amounts are not added together: each is a different kind of figure.
Aug 6, 2025 · Waccamaw Neck WTP is planning a best available treatment technology to meet the recently-released USEPA PFAS regulations. Our most current PFAS sampling results is trending downward. The proposed project will include an increase sampling plan and evaluation of the various treatment options to meet the current MCL limits for PFAS. PFAS capture technologies such as GAC, ion exchange resin, Nano-filtration, foam fractionation, and/or PFAS destruction methods will be evaluated and testing results will be analyzed to provide a basis of design for the full scale plant. The requirements of the proposed technologies will be studied with respect to effectiveness, infrastructure needs, costs, and compatibility with future PFAS treatment technologies. A bench-scale testing will be performed to determine the most suitable technology for PFAS removal at the Waccamaw Neck WTP. The bench-scale testing will also include analyses to evaluate the effectiveness of total organic carbon (TOC) reduction, need for pH adjustment, and alkalinity concentration. Based on the results of the study, a Preliminary Engineering Report (PER) for the PFAS treatment project will be developed. · $700k
On SRF fundable list (Provisional Priority List). Source →