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Federal Maximum Contaminant Levels for PFAS in Cleveland County's Water System

The public water supply serving Cleveland County, Arkansas, including the HWY 63 WATER ASSOCIATION system, draws groundwater to serve over 7,000 people through nearly 3,000 connections. In federal monitoring from early to mid-2025 under the Unregulated Contaminant Monitoring Rule 5 (UCMR5), key per- and polyfluoroalkyl substances (PFAS)—such as PFOA, PFOS, PFHxS, PFNA, and HFPO-DA—were measured. Notably, no samples exceeded the new 2024 federal Maximum Contaminant Levels (MCLs) established for these compounds, ranging between 4.0 and 10 nanograms per liter (parts per trillion). This means that while these 'forever chemicals' were tested, their concentrations in the public system fell below federal health-based thresholds during this survey period.

Interpreting the Hazard Index of Newer Fluorinated Compounds Without Inferring Health Risk

In addition to the regulated PFAS, multiple newer fluorinated compounds were also monitored but do not yet have established federal MCLs. Assessments often consider a hazard index for mixtures of these substances, which is a calculated estimate of combined exposure potential but does not constitute a health finding on its own. The presence or absence of measurable levels in these compounds within the local water system record does not alone describe a health condition or risk. Instead, it underscores the complexity of fluorinated compound occurrence in water systems and the importance of ongoing monitoring and household-level testing to evaluate individual water quality.

Comparing Cleveland County's PFAS Water Data with Neighboring Areas Without Overinterpreting

When looking at PFAS data from Cleveland County, comparisons to neighboring counties should consider differences in sampling size, source water types, and local environmental factors. For example, a neighboring water system might report occasional detections above reporting levels, whereas Cleveland County’s recorded results show none. These variations reflect system-specific conditions and monitoring designs rather than direct indications of water safety at any individual home. Such comparisons are useful for understanding regional patterns but should not be overread as applying to every household's tap water.

Sample Size and Well Representation: What the Monitoring Numbers Tell Us

The UCMR5 results for the HWY 63 WATER ASSOCIATION are based on 10 samples collected over a several-month period. Although this provides a snapshot of the water quality in this public system, the relatively small number of samples means that localized variations, especially in private wells or household-level plumbing, may not be fully captured. Testing your own water is the only way to know specific concentrations of PFAS or other substances at your tap. This distinction highlights why public system records are informative but not definitive for individual households, especially after your existing equipment has failed to address PFAS concerns.

Household and Property Considerations for Large or Seasonal Use in Cleveland County

For larger households, second homes, or seasonal properties in Cleveland County, water demand and usage patterns can affect the performance and maintenance needs of water treatment options. Households facing PFAS concerns after previous equipment failure may consider solutions that can be directly purchased and configured for their residence. These products, designed to reduce fluorinated compounds commonly called 'forever chemicals,' can be scaled or adapted depending on household size and usage frequency to maintain effective water quality management.

One such solution is the Pentair PFAS Forever Chemicals Filter, a system engineered to address a broad spectrum of PFAS compounds documented by federal monitoring. This product ships ready to configure for residential water treatment needs, offering a practical step when prior equipment no longer performs as required.

In conclusion, the PFAS data from Cleveland County’s public water system provide valuable information about chemical occurrences at the system level but do not specify conditions for individual homes. Homeowners concerned about PFAS should obtain personalized water testing to guide treatment choices. For detailed federal data, consult the EPA's Safe Drinking Water Information System records for HWY 63 WATER ASSOCIATION and other relevant sources.

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