The Hampden Water District, serving over 4,600 people in Penobscot County, Maine, has undergone federal monitoring for PFAS compounds. This checklist page explains the monitoring data, what the individual readings mean, and how to approach assessing your household’s water in light of the EPA’s findings.
Understanding Measurement Units and Detection Limits for PFOA and PFOS
Why PFAS concentrations are shown in nanograms per litre (ng/L)
PFAS such as PFOA and PFOS are reported in nanograms per litre, equivalent to parts per trillion, reflecting extremely small concentrations. The reporting levels for Hampden’s system are as low as 0.003 to 0.005 ng/L, indicating sensitive detection capability.
Four decimal places convey measurement precision
Measurements to four decimal places mean the instruments can reliably detect concentrations as low as a few thousandths of a nanogram per litre. For example, the reporting level for PFOA is 0.004 ng/L, a value far below the federal maximum contaminant level (MCL) of 4.0 ng/L set for 2024.
Interpreting Hazard Indices for Newer PFAS Compounds
Multiple fluorinated compounds monitored without individual safety claims
The Hampden Water District was monitored for several PFAS types, including PFHxS, PFNA, HFPO-DA, and others often grouped with "forever chemicals." Although these are measured, the federal MCLs established apply to specific compounds like PFOA and PFOS primarily.
Hazard index is a combined measure but not a direct health assessment
When multiple PFAS are present, scientists consider a hazard index to estimate cumulative potential effects, but federal records for Hampden show no detected concentrations above reporting levels, making such calculations unnecessary here.
How to Read a Certified Laboratory PFAS Test Report
Results include detected concentration, reporting level, and applicable MCL
A certified lab report for your home water test will show PFAS concentrations if detected, compared against reporting levels and federal MCLs. Detection means the compound was measured, not that it surpasses safety thresholds.
Non-detections mean concentrations are below the lab’s minimally measurable limit
For Hampden’s system, all twelve samples showed no detection of PFOA, PFOS, or related compounds above the low reporting thresholds, which implies that if present at all, these compounds exist below those limits.
How Fleck PFAS Forever Chemicals Filter Treats Fluorinated Compounds
The Fleck System uses advanced filtration to reduce PFAS in household water
This filter technology targets 'forever chemicals' by adsorbing fluorinated compounds like PFOA and PFOS. It prepares ready-to-configure filtration equipment designed to reduce these substances directly at your tap.
Designed for residential use to complement supply monitoring
Even with public water testing showing no detections above reporting levels, some homeowners prefer additional filtration as a precautionary step or where private tests indicate presence.
Checklist: Steps to Assess Your Household Water for PFAS
Rule out inexpensive factors first
- Check whether your home uses the public water system or a private well, as this affects which tests apply.
- Review public water quality reports online to understand area-wide results for PFAS.
Consider certified laboratory testing
- Obtain a certified test from an EPA-approved lab focusing on individual household water.
- Ensure the lab reports concentrations in nanograms per litre with reference to reporting levels.
Compare your test results carefully
- Understand that detection does not equate to exceeding federal limits or unsafe water.
- Interpret non-detection as concentrations below the lab’s measurable thresholds, consistent with Hampden’s public water record.
What Hampden Water District's PFAS Range Means
Detected PFAS concentrations were below the minimal reporting levels
The twelve samples collected from the public water system from February to December 2024 detected no PFOA, PFOS, or other PFAS compounds above reporting levels ranging from 0.003 to 0.005 ng/L.
This range is well below federal maximum contaminant levels effective in 2024
Federal MCLs for individual PFAS like PFOA and PFOS are set at 4.0 ng/L and higher for others, indicating the water system’s fluorinated compound levels, based on monitoring, fall comfortably below these limits.
Non-detection does not confirm absence in individual household water
Because the data represent system-wide monitoring and surface water source conditions, individual household water may vary; only private testing can establish individual readings.
These findings and monitoring results focus on the Hampden Water District public supply in Penobscot County, Maine, as recorded by the EPA under the Safe Drinking Water Information System. For detailed data, refer to the EPA’s public data repository.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2024-12-04. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR5 monitoring (2023-2025) for HAMPDEN WATER DISTRICT (ME0090660), ME: 120 results across 10 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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