Autotrol PFAS Forever Chemicals Filter

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What Are Nanograms per Liter and Why Four Decimal Places Matter for PFOA and PFOS

PFAS, short for per- and polyfluoroalkyl substances or fluorinated compounds, are often measured in units called nanograms per litre (ng/L), which equals parts per trillion (ppt). This tiny scale is crucial because these substances are present at very low concentrations in water. Four decimal places, such as 0.004 µg/L, reflect extremely sensitive detection levels that allow federal agencies and water systems to track these "forever chemicals" precisely even when present in minuscule amounts.

Potential Regional Sources of PFAS: Firefighting Foam, Textile Finishing, and Landfills

In Cleveland County, Arkansas, the groundwater supply for the HWY 63 Water Association serves about 7,187 people. Although PFAS are associated broadly with industrial uses like firefighting foam, textile finishing, and landfill leachate, the public drinking water system's monitoring record from 2025 shows no detections above reporting levels for various common PFAS types. This suggests that none of these typical regional PFAS sources have significantly affected this system's groundwater to a degree measurable at these sensitive thresholds.

Why Different PFAS Removal Methods: Granular Carbon Beds versus Ion-Exchange Resins

When treating water for PFAS, certified systems rely on technologies such as granular activated carbon beds or ion-exchange resins, each documented differently for effectiveness. Granular carbon beds adsorb a range of "forever chemicals" including PFOA and PFOS by trapping molecules on their surfaces. Ion-exchange resins operate by swapping harmful ions for benign ones, targeting specific PFAS compounds. Understanding these differences helps homeowners choose appropriate solutions for their water quality concerns.

Sample Size and Well Distribution Behind PFAS Monitoring Data

The monitoring data from the HWY 63 Water Association is based on 10 samples for each PFAS compound of interest, collected across the groundwater system. While this sampling provides a snapshot indicating that PFAS levels are below reporting thresholds, a small number of samples limits certainty about localized variations. Households with private wells may not have water quality represented by this data, as individual well conditions can differ significantly.

How PFAS Enter Groundwater and Distribution Systems in Cleveland County

PFAS can enter groundwater through various pathways, including industrial discharges, contaminated soils, and water runoff from areas where firefighting foams or chemical treatments were used. In Cleveland County, groundwater is the primary source feeding the HWY 63 Water Association's system. The monitoring record showing no detections above reporting limits suggests that these pathways currently contribute minimal measurable PFAS to the public water supply. However, household water quality depends on the specific well and plumbing conditions.

Next Step: Testing Your Own Household Water for PFAS

To determine your household's PFAS levels, the single important test is a direct water analysis focused on the specific fluorinated compounds listed in federal monitoring, such as PFOA, PFOS, and others. Results below the reporting limits found in the regional public system would indicate similar low levels. If measurements show presence above these thresholds, then appropriate treatment options like the Autotrol PFAS Forever Chemicals Filter system—which ships ready to configure for home use—can effectively address your water quality concerns.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2025-07-14. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR5 monitoring (2023-2025) for HWY 63 WATER ASSOCIATION (AR0000107), AR: 100 results across 10 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level