Pentair PFAS Forever Chemicals Filter

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The EPA’s data from the CTWC Shoreline Region-Guilford public water system, which serves nearly 34,000 people across Clinton, Guilford, Madison, Old Saybrook, Westbrook, and other parts of New Haven County, shows detections of several PFAS compounds in surface water supply used for residential drinking water.

1. The Hazard Index for Fluorinated Compounds Mixtures

PFAS — short for per- and polyfluoroalkyl substances — include various individual chemicals sometimes called "forever chemicals" due to their environmental persistence. While the EPA does not report health-based violations for this water system, it monitors multiple PFAS compounds to understand potential cumulative exposure. The hazard index combines several PFAS concentrations to assess mixture-related concern without assigning safety or violation status. This composite figure helps guide research and treatment development rather than signaling immediate household risk.

2. Reading Median and Range Values as a Homeowner

The EPA reported 22 sample results for each PFAS compound between March 2024 and September 2025. For PFOA, 8 detections ranged from just above 0.004 nanograms per liter (ng/L or parts per trillion) up to 0.006 ng/L. PFOS showed 6 detections from 0.004 up to 0.012 ng/L. These are well below the federal maximum contaminant levels (MCLs) set at 4 ng/L for PFOA and PFOS in 2024. Median detected values represent the middle point in positive results and help illustrate typical presence, while the highest values indicate peak detection during this period. This range reflects variability but not safety status.

3. Seasonal and Multi-Year Variation in PFAS Levels

The monitoring spans 18 months, capturing seasonal shifts that can influence PFAS levels in surface water sources. Rainfall, runoff, and environmental factors may cause fluctuations in detected concentrations. Sampling across multiple dates ensures that single measurements do not misrepresent ongoing conditions. This extended survey approach can highlight trends but does not assign individual household water quality, which requires specific testing of the home’s supply.

4. Changes in Treated Water at the Household Tap

Once a household chooses treatment equipment designed for PFAS reduction, the water quality profile at the tap can change significantly. Specialized filtration technology targets fluorinated compounds, reducing concentrations to lower levels than those reported in untreated system measurements. This difference reflects the treatment's effect at the point of use, helping to address the consumer’s concern about "forever chemicals" in their water.

5. How Documented Treatment Technology Works on PFAS

The Pentair PFAS Forever Chemicals Filter uses advanced filtration methods to capture a broad range of PFAS compounds. Through combined processes detailed in its documentation, this filter reduces fluorinated compounds including PFOA, PFOS, and others reported in the regional water system. By addressing these persistent substances directly, the technology provides a clear path to lowering in-home exposure for households seeking to manage their water quality independently.

For New Haven County residents reviewing EPA monitoring data and comparing equipment classes, the Pentair system ships ready to configure and stands as a proven option for reducing PFAS as measured in local surface water sources. Choosing this documented solution lets homeowners respond proactively to the measured presence of per- and polyfluoroalkyl substances in their region’s public water supply.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2025-09-22. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR5 monitoring (2023-2025) for CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011), CT: 220 results across 10 listed contaminants, 26 detections above the reporting level; 12 results above a 2024 federal MCL