Fleck PFAS Forever Chemicals Filter

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The Hazard Index for Mixtures of Newer Fluorinated Compounds, Explained Without a Health Claim

When assessing water quality, especially for emerging contaminants like PFAS (per- and polyfluoroalkyl substances), water systems sometimes evaluate the combined presence of multiple related compounds using a hazard index. This index aggregates individual chemical measurements to provide an overall indication of the mixture’s presence. It does not indicate that the water is unsafe but helps prioritize monitoring and control strategies.

In Cleveland County, the HWY 63 Water Association’s public water system has been monitored for several PFAS compounds, including PFOA, PFOS, PFHxS, PFNA, HFPO-DA, and others. None of these compounds were detected above the reporting levels in recent federal monitoring, so the hazard index based on these samples would be effectively low. This monitoring helps provide insight into the regional occurrence of these substances as 'forever chemicals' known for their environmental persistence.

Firefighting Foam, Textile Finishing, and Landfill Sources: Which Fits This Region’s Record

PFAS compounds often enter groundwater through industrial uses such as firefighting foam, textile finishing, and landfill leachate. In Cleveland County’s HWY 63 Water Association system, which draws from groundwater, no detections of the principal PFAS compounds have appeared above reporting levels in the 2023 to 2025 UCMR5 survey. This absence suggests that, at least within the monitored wells supplying this system, significant PFAS releases from common sources have not been measured.

While these industrial sources are common contributors to PFAS pollution in many regions, the data for this system indicates that typical local groundwater sources do not show measurable PFAS contamination within the detection limits used. This indicates regional groundwater quality that, according to federal testing, contains PFAS below the nanogram per litre thresholds commonly applied in federal regulation.

What Questions a Commercial or Industrial Operator Adds That a Household Does Not

Commercial and industrial water users may need to consider additional questions beyond those relevant to residential households. These include:

• Whether water usage volumes and process requirements might concentrate PFAS or require specialized management.
• Compliance with regulatory reporting and discharge limits specific to industrial wastewater.
• Exposure scenarios for employees or customers potentially in contact with untreated or process water.
• Evaluations of upstream supply sources to identify any industrial PFAS contributions.

For most households in Cleveland County, the primary concerns are about the presence of PFAS in tap water and the steps to reduce or control these substances, based on the region’s monitoring data. Homes typically require targeted filtration that addresses PFAS where detected or suspected.

The Household or Facility Symptoms That Do and Do Not Point to This Problem

Certain water quality issues might prompt suspicion of PFAS presence, but many common household symptoms do not correlate. PFAS compounds are colorless and tasteless, so they do not cause noticeable taste or odor changes in water. They also do not produce staining or sediment.

Symptoms that do not reliably indicate PFAS include:

• Cloudy or discolored water
• Metallic taste or smell
• Hardness scale buildup
• Visible sediment or particulate matter

PFAS presence can only be confirmed by laboratory testing of water samples analyzed for specific fluorinated compounds. If you are concerned about PFAS in your household water, testing for these 'forever chemicals' is the only definitive approach.

Why PFOA and PFOS Are Measured in Nanograms per Litre and What Four Decimal Places Mean

PFOA and PFOS are among the most studied PFAS compounds. These substances are measured in nanograms per litre (ng/L), equivalent to parts per trillion (ppt), due to their extremely low concentration levels and persistence in the environment. Federal Maximum Contaminant Levels (MCLs) set for PFOA and PFOS are 4.0 ng/L, reflecting the precise, scientifically-based thresholds regulators use to gauge potential concern.

The reporting levels used in federal UCMR5 monitoring for the HWY 63 Water Association system in Cleveland County are 0.004 µg/L (4 ng/L) or lower for these substances, reflecting advanced detection capabilities. Four decimal places in measurement represent the precision needed to distinguish very small amounts of these compounds in water samples — differentiating between parts per trillion rather than parts per billion or million.

How Seasonal or Multi-Year Variation Shows in the Record (Dates and Ranges Given)

Monitoring records for the HWY 63 Water Association public water system show sampling dates from January 6, 2025, through July 14, 2025. Across these months, repeated samples for each regulated PFAS compound consistently showed no detections above reporting levels. This consistency across the first half of 2025 indicates stable conditions without measurable seasonal spikes or increasing trends at the system level.

Multi-year comparisons will require further data from ongoing monitoring projects, but the current record provides a baseline understanding that these particular PFAS substances have not been detected above the sensitive thresholds applied in this system’s groundwater supply in recent months.

Considering the regional monitoring results, households in Cleveland County concerned with PFAS can evaluate their water quality through specific testing and then apply targeted treatment if needed. The Fleck PFAS Forever Chemicals Filter ships ready to configure and provides a proven technology to reduce per- and polyfluoroalkyl substances effectively in residential water systems.

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