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Understanding Seasonal and Multi-Year Variation in PFAS Sampling Records

The Pechanga public water system in area 09 has been monitored for PFAS compounds under the EPA's Unregulated Contaminant Monitoring Rule from August 23, 2023 through December 30, 2024. This surveillance captures multiple sampling points over one and a half years, providing an overview of PFAS presence fluctuations across seasons and operational conditions.

During this period, results show no detections of PFOA, PFOS, PFHxS, PFNA, or HFPO-DA above their respective reporting levels, and none exceeded the federal maximum contaminant levels (MCLs) set for 2024. However, some PFAS like PFBS, PFHxA, and PFPeA were detected intermittently at low concentrations close to their reporting limits. These variations can reflect temporary changes in water source inputs or treatment effectiveness but do not indicate persistent high levels.

Working Through Median and Range Values as a Homeowner

For PFBS, PFHxA, and PFPeA, the data show two detections out of twelve samples each. The highest recorded concentrations were 0.003 µg/L for PFBS, 0.0062 µg/L for PFHxA, and 0.0089 µg/L for PFPeA. Median values of detected samples were similar, suggesting that when these substances appear, they are at low levels just above detection thresholds. Understanding these medians and ranges helps homeowners realize that occasional low-level PFAS presence is part of system-wide measurement but does not equate to a continuous or elevated risk at home.

How Public Water System Data Differs from Private Well Testing

It is important to remember that the Pechanga system data reflect composite water quality serving thousands of connections in area 09. This record does not measure your individual household tap or private well water. Private well owners must perform specific laboratory testing to determine their own water’s PFAS concentrations because local variations in groundwater or plumbing can differ markedly from public supply results. Public records provide regional context but cannot substitute for personal testing when deciding treatment needs.

Information to Document Before Consulting Treatment Options

Before selecting any treatment system, note what PFAS compounds and concentrations your own water test reveals. Record sampling dates and methods, as well as any known water source changes. Compare your results carefully against federal reporting levels and health-based limits. Having this information at hand enables tailored advice and an appropriate choice of treatment class that matches your water’s PFAS profile rather than relying solely on system-wide data.

Why Aesthetic Secondary Standards Differ from Health-Based Limits for PFAS

Secondary standards for PFAS focus on maintaining acceptable taste, odor, staining, and corrosion control in water and are distinct from health-based regulatory limits. The 2024 federal MCLs for certain PFAS are health-oriented concentration maximums. Detected concentrations in the Pechanga system fall well below these health-based MCLs, indicating no violation or safety concern at the system level. Aesthetic considerations may influence some household treatment choices but should not be conflated with health compliance.

Impact of Sample Depth, Well Depth, and Source Type on Expected PFAS Levels

Sample collection depth and type of water source – surface water or groundwater – affect PFAS measurements. The Pechanga system’s monitoring integrates various source inputs and treatment stages, which can dilute or concentrate PFAS. Deeper wells may show different compound profiles than shallow wells. Knowing your water source type and historic depth helps anticipate which PFAS compounds are more likely detected and guides your approach to testing and treatment selection.

Conclusion: Matching Treatment to Your Water’s PFAS Demand

Deciding on the proper PFAS treatment class begins with understanding your household water’s specific PFAS levels through laboratory testing. The Pechanga public water system’s 2023-2024 monitoring shows low or no detections well within federal health limits, providing regional context. For homes requiring filtration, the Fleck PFAS Forever Chemicals Filter ships ready to configure and addresses PFAS compounds effectively according to your measured demand figure.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2024-12-30. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR5 monitoring (2023-2025) for Pechanga (090605013), 09: 120 results across 10 listed contaminants, 6 detections above the reporting level; compared with the applicable federal MCL, none above