PFAS in South Carolina Drinking Water in 2026: What Residents Need to Know

What PFAS are and why they matter

PFAS (per- and polyfluoroalkyl substances) are a class of more than 12,000 synthetic compounds with carbon-fluorine bonds, the strongest single bond in organic chemistry. That bond is why PFAS earned the "forever chemicals" name; they do not break down on a timescale that matters for human or ecological cleanup. PFAS have been linked in peer-reviewed studies to elevated cholesterol, reduced vaccine response in children, thyroid disease, and several cancers. The CDC's National Health and Nutrition Examination Survey has detected PFAS in the blood of more than 97 percent of sampled Americans.

In South Carolina, the primary PFAS sources tracked publicly are industrial discharge upstream on the Savannah River, legacy firefighting foam use at military and aviation sites, and historical wastewater treatment plant effluent. Surface-water utilities (Charleston Water System, BJWSA, GSWSA) carry more PFAS risk than groundwater-only utilities because surface water aggregates upstream contamination.

The 2024 EPA rule in plain terms

On April 10, 2024, the EPA finalized the first National Primary Drinking Water Regulation for PFAS. The regulation sets enforceable Maximum Contaminant Levels (MCLs) for six PFAS compounds:

• PFOA: 4.0 parts per trillion
• PFOS: 4.0 parts per trillion
• PFHxS: 10 parts per trillion
• PFNA: 10 parts per trillion
• HFPO-DA (GenX): 10 parts per trillion
• Mixtures: Hazard Index of 1 for combinations of PFHxS, PFNA, HFPO-DA, and PFBS

Compliance timeline: public water systems must complete initial monitoring by April 2027 and must comply with the MCLs by April 2029. Systems that exceed an MCL must notify the public and take action to reduce levels. The rule applies to every public water system in South Carolina, including small rural utilities.

What coastal SC utilities have published

Charleston Water System

Charleston Water System publishes its annual Consumer Confidence Report at charlestonwater.com/199/Water-Quality-Reports. The utility began voluntary PFAS sampling before the 2024 rule and reports results in the CCR. Charleston Water System draws from the Edisto River and Bushy Park Reservoir.

Beaufort-Jasper Water and Sewer Authority (BJWSA)

BJWSA has the most public PFAS history of the four major Lowcountry utilities. The Savannah River source has documented upstream industrial inputs, and BJWSA has been sampling and reporting PFAS publicly for several years. Reports are at bjwsa.org/your-water/water-quality.

Grand Strand Water and Sewer Authority (GSWSA)

GSWSA pulls from the Atlantic Intracoastal Waterway and the Black Creek aquifer. PFAS sampling is reported in the annual CCR at gswsa.com/water-quality.

Mount Pleasant Waterworks

Mount Pleasant Waterworks blends Charleston Water System surface water with Middendorf and Black Creek groundwater. PFAS data are reported in the CCR at mpwonline.com/water-quality.

We deliberately do not republish specific PFAS numbers from these utilities here. The CCRs change annually, and the authoritative source is the utility's most recent posted report.

What removes PFAS at home

EPA recognizes three treatment technologies for residential PFAS reduction:

• Granular activated carbon (GAC). Effective on longer-chain PFAS (PFOA, PFOS), less effective on short-chain compounds. Capacity drops over time and breakthrough is hard to detect without lab confirmation. Whole-house GAC sized aggressively with replacement schedules tracked to actual feed concentration is the best home-scale GAC application.
• Ion exchange (anion resin). High capacity for PFAS, but the resin is single-use (not regenerable for PFAS service), and disposal is complicated by the captured contaminant.
• Reverse osmosis. The most thoroughly validated residential option. RO membranes remove PFOA and PFOS at greater than 90 percent under NSF/ANSI 58 testing. Combined with carbon prefiltration, RO is the residential gold standard.

NSF certifications to look for

• NSF/ANSI 58 with P473 claim for PFOA and PFOS reduction on reverse osmosis systems.
• NSF/ANSI 53 with PFOA/PFOS claim for activated carbon point-of-use filters.
• "Reduces PFAS" without a specific NSF standard reference is a marketing claim, not a verified one.

Our RO drinking water pillar covers the NSF certification system in more depth.

What BJWSA's PFAS work has actually included

BJWSA has been the most transparent of the Lowcountry utilities on PFAS, in part because the Savannah River source has documented upstream industrial inputs. The utility has run voluntary PFAS sampling at the Chelsea and Purrysburg plants for several years, posted results publicly in the annual CCR, and discussed PFAS treatment options at public board meetings. Treatment upgrades on the table for any utility facing a PFAS-driven MCL exceedance generally fall into three buckets: deeper granular activated carbon contactors at the treatment plant, ion-exchange resin beds, or membrane-based treatment. Each carries multi-million-dollar capital cost, and the utility's 2029 compliance deadline pushes the timeline. None of this changes what an individual homeowner can do at the tap today, which remains NSF/ANSI 58 P473 reverse osmosis or NSF/ANSI 53 carbon point-of-use.

Grand Strand Water and Sewer Authority source mix

GSWSA pulls raw water from the Atlantic Intracoastal Waterway at the Bull Creek Water Treatment Plant and blends with Black Creek aquifer groundwater. The Intracoastal source carries a high natural organic carbon load that drives summer disinfection-byproduct readings. PFAS sampling has been part of the GSWSA CCR for the most recent reporting cycles, and the utility extends the same data transparency to PFOA, PFOS, PFHxS, PFNA, and HFPO-DA that BJWSA has shown. For Myrtle Beach filtration, North Myrtle Beach filtration, Conway filtration, and Surfside Beach filtration customers, the relevant question is the same: does your most recent CCR show any PFAS readings near the new MCLs? If yes, an under-sink RO at the kitchen tap is the most direct intervention.

Hurricane and flood considerations

Coastal SC water treatment work has a hurricane footnote. After a major storm, surface-water utilities sometimes see short-term spikes in raw-water organic carbon load from runoff, which can shift PFAS concentrations at the intake. Public water systems are required to maintain compliance through these events, but post-event CCR data is worth reading carefully in years where the coast took a direct hit. Private wells, especially shallow wells in Jasper, Beaufort, and Horry counties, face a separate set of post-event risks documented in our post-flood disinfection article. The hurricane season prep article covers the pre-event checklist.

Septic-system interaction with PFAS treatment

Outlying coastal properties on private septic don't change PFAS treatment recommendations at the kitchen tap, but they do change how we tune reject-water volume on under-sink RO systems. A standard 2:1 reject-water RO discharges roughly 2 gallons of brine for every 1 gallon of treated water, and that brine runs through the septic system. Older or undersized septic systems can struggle with the additional volume. We default to high-recovery RO systems (permeate-pump assisted, closer to 1:1) on every septic install for this reason. Our well water treatment guide and the coastal SC well water pillar cover the septic-side details.

Should you test your own water?

If you are on city water served by Charleston Water System, BJWSA, GSWSA, or Mount Pleasant Waterworks, the utility's CCR data is more current, more representative, and more rigorously analyzed than a one-time home sample.

If you are on a private well in outlying Beaufort, Jasper, Horry, or Georgetown County, especially within five miles of a known industrial site or a former military firefighting training site, a one-time certified-lab PFAS test is worth the money. Cost runs $200 to $400 per sample for a basic panel and the lab must be on EPA's certified list for Method 537.1 or 533. We can point you to a current list of SC-area labs.

What about bottled water?

Bottled water is regulated by the FDA under the Federal Food, Drug, and Cosmetic Act, not by EPA. PFAS testing is not required for bottled water under current FDA rules. Several independent investigations (Consumer Reports 2020, Johns Hopkins 2021) have detected PFAS in commercial bottled water samples. Bottled water is also more expensive per gallon than treated tap water and generates packaging waste. A certified point-of-use system is more cost-effective, more verifiable, and easier to maintain.

The condition-to-action table

Call a professional if…

• You're on a private well within five miles of a known industrial or firefighting-training source. The right test panel matters.
• You're considering a whole-house carbon system for PFAS. Sizing, breakthrough monitoring, and replacement scheduling have to match feed-water data, not a generic spec sheet.
• You're shopping RO systems and seeing "removes PFAS" claims without an NSF/ANSI 58 P473 reference.
• You're pregnant or have a child under one year, and you use tap water for formula. PFAS reduction matters more for that life stage.

What to do this week

1. Pull your utility's most recent CCR. The relevant rows are labeled PFOA, PFOS, PFHxS, PFNA, HFPO-DA, and PFBS.
2. If you're on a private well in a high-risk area, get a certified-lab PFAS test.
3. If you want kitchen-tap PFAS reduction now, get an NSF/ANSI 58 P473-certified under-sink RO system.
4. Set a calendar reminder to pull next year's CCR in spring 2027.