PFAS in Kershaw County: Understanding Mixture Hazards and Seasonal Variations

Are PFAS chemicals a concern for your household water in Cassatt, Kershaw County? Government monitoring shows no detections of PFAS compounds above reporting levels in the public water system supplying this area. Understanding this, let's address common beliefs and what the data reveals.

Belief: The hazard from mixtures of newer PFAS compounds is well defined

Many people worry that combined levels of various per- and polyfluoroalkyl substances (PFAS)—including PFOA, PFOS, PFHxS, PFNA, HFPO-DA, and others—in their water might pose a significant risk based on cumulative exposure. However, while some hazard indices exist for mixtures, regulatory agencies have not established such indices as enforceable or definitive health metrics. The EPA's unregulated contaminant monitoring rule (UCMR5) reports detection levels of these fluorinated compounds in nanograms per liter (ng/L) or parts per trillion (ppt), but no health-based violations have been recorded for the Cassatt public water system. This means that while scientific study continues, current data does not confirm a measurable hazard from mixtures detected in this area.

Belief: Firefighting foams, textile finishing, or landfills are major PFAS sources here

The main public water supplier in Cassatt, Kershaw County, draws from groundwater. Federal monitoring over 26 samples collected from 2024-01-22 to 2024-08-13 detected no PFAS compounds above reporting levels. This suggests that if local sources like fire-fighting foam runoff or industrial textile operations were causing PFAS presence, it has not raised detectable levels in the supply. Landfills likewise have not resulted in measurable PFAS contamination in this system’s groundwater. These facts align with the system’s record of zero health-based violations concerning PFAS.

Belief: Large households, second homes, or seasonal properties require different PFAS treatment considerations

Household water use volume can influence how treatment options are evaluated. For larger homes or seasonally occupied properties in Cassatt, water demand varies, but PFAS presence in the public system does not. Since no PFAS compounds were detected above reporting levels here, considering advanced treatment or filtration for 'forever chemicals' depends less on household size and more on individual water testing if a private well is used. For municipal connections, the system’s record provides reassurance about consistent water quality regarding PFAS.

Belief: Seasonal or multi-year fluctuations in PFAS levels affect water safety

Sampling from early 2024 to mid-2024 for multiple PFAS compounds showed no detection above reporting thresholds in Cassatt’s water supply. This monitoring spans enough months to observe seasonal trends. While some regions experience PFAS variation over time, this public system has maintained nondetect levels consistently within this period. Future monitoring will continue, but current data indicates stable water quality regarding these fluorinated substances.

Belief: Measured PFAS ranges close to federal standards indicate a health risk

The EPA’s 2024 federal maximum contaminant levels (MCLs) for several PFAS chemicals are 4.0 ng/L (ppt) for PFOA and PFOS and up to 10 ng/L for others. The Cassatt water system’s monitoring found zero detections above the much lower reporting levels—hundreds of times below those MCLs. Therefore, the absence of measurable PFAS means the water system does not come close to federal limits. Detection absence is not a health safety statement for private wells, but public water here currently meets all health-based standards for PFAS.

Belief: Testing individual taps or appliances is sufficient to assess PFAS risk

Sampling conducted by government agencies targets the public water system source and distribution points but does not test each household tap. For residents on municipal water, these results reflect the water entering the home before any plumbing or fixtures. Assessing your own household’s water quality related to PFAS would require specific laboratory testing of your tap water. This is the only way to know if any changes occur after public supply entry, such as from plumbing or private well use. The Fleck PFAS Forever Chemicals Filter ships ready to configure for home water treatment and offers a documented method for reducing PFAS levels if individual testing indicates the need.

What you should not conclude: The absence of PFAS detections above reporting levels in the Cassatt, Kershaw County public water system means that the public supply meets current federal health guidelines. It does not guarantee that any specific home’s water is free of PFAS without testing that household’s water source. Also, lack of detection is not a health claim but a reflection of this system’s performance during federal monitoring.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2024-08-13. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR5 monitoring (2023-2025) for CASSATT WTR KERSHAW-LEE CO RWA (SC2820005), SC: 260 results across 10 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level