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Government sampling of the Barrow Utilities & Electric Cooperative public water system indicates detections of multiple per- and polyfluoroalkyl substances (PFAS) compounds, including some above recent federal maximum contaminant levels (MCLs), without representing violations or specific household water conditions.

1. Which PFAS Compounds Have 2024 Federal MCLs in This Record?

PFOA (Perfluorooctanoic acid)

There were 12 samples with no detections above the reporting level of 0.004 micrograms per liter (µg/L) or 4 nanograms per liter (ng/L, parts per trillion). The federal MCL is 4.0 ng/L, and no samples exceeded it.

PFOS (Perfluorooctanesulfonic acid)

Out of 12 samples, 4 were detected above the reporting level of 0.004 µg/L. The highest measured concentration was 0.0463 µg/L (46.3 ng/L), exceeding the 2024 federal MCL of 4.0 ng/L.

PFHxS (Perfluorohexanesulfonic acid)

Four detections above the reporting level of 0.003 µg/L occurred, with a highest concentration of 0.0185 µg/L (18.5 ng/L) surpassing the federal MCL of 10 ng/L.

PFNA (Perfluorononanoic acid)

No detections above the reporting level of 0.004 µg/L were recorded. The federal MCL is 10 ng/L, with no exceedances reported.

HFPO-DA (Hexafluoropropylene oxide dimer acid)

There were no detections above the 0.005 µg/L reporting level; the federal MCL is 10 ng/L.

2. The Hazard Index for Mixtures of Newer PFAS Compounds, Explained Without a Health Claim

Understanding Combined Exposure

This water system also shows detections of PFHxA, PFPeA, PFBA, and PFHpA, all fluorinated compounds detected in multiple samples above their respective reporting levels but without established federal MCLs as of 2024.

Hazard Index Concept

The hazard index aggregates potential effects from multiple PFAS compounds, weighing their concentrations relative to health benchmarks. It helps understand complex mixtures' presence without declaring safety or risk. This index is a tool for assessing overall PFAS occurrence.

3. Why PFOA and PFOS Are Measured in Nanograms per Liter and What Four Decimal Places Mean

Measurement Units and Precision

• PFAS substances like PFOA and PFOS appear in extremely low concentrations; thus nanograms per liter (ng/L), equivalent to parts per trillion (ppt), are used.
• Four decimal places in measurements indicate precise laboratory instrumentation detecting minuscule quantities, crucial for regulatory guidance and risk assessment.
• Reporting levels such as 0.004 µg/L mean the smallest reliably quantifiable concentration for the given compound.

4. Firefighting Foam, Textile Finishing and Landfill Sources: Which Fits This Region's Record?

Local Industrial and Environmental Context

Barrow's public water system draws from surface water without nearby textile finishing plants or known firefighting foam contamination events documented in federal records.

Potential PFAS Origins

Presence of PFOS and related compounds could reflect historic or dispersed environmental sources such as legacy firefighting foam use or distant atmospheric deposition. The absence of some PFAS compounds common to other industrial activities aligns with this region's limited industrial footprint.

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

Sampling Period

The 12 samples were collected from October 22, 2024, to December 3, 2024, representing a single federal unregulated contaminant monitoring rule (UCMR5) cycle.

Variation Insights

While this provides a snapshot in late 2024, seasonal or annual fluctuations are not detailed in this data set. Multiple-year samples would be needed to observe trends or consistent changes in PFAS levels.

Implications for Households

Because PFAS levels can vary over time, individual household water tests are necessary for precise knowledge of on-site conditions beyond the public system record.

These points summarize government monitoring of PFAS ‘‘forever chemicals’’ in Barrow's public water supply serving approximately 4,900 residents. The data originates from the EPA's Safe Drinking Water Information System and unregulated contaminant monitoring rule reports. To address PFAS presence at the household level, the Pentair PFAS Forever Chemicals Filter ships ready to configure and can reduce a range of fluorinated compounds documented in such area records.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2024-12-03. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR5 monitoring (2023-2025) for BARROW UTILITIES & ELEC. COOP., INC. (BU (AK2320078), AK: 120 results across 10 listed contaminants, 23 detections above the reporting level; 8 results above a 2024 federal MCL