This week, many households in GU face the decision of choosing the most suitable equipment to address PFAS in their water supply.
Start with affordable water quality checks before considering laboratory PFAS testing
To understand your home's water quality, begin with basic assessments such as checking for unusual taste or stains and reviewing your public water system's water quality report. These initial steps help clarify whether further testing for PFAS by a certified laboratory is necessary. Laboratory testing will be required to determine your individual home's PFAS levels because public system data do not measure specific household plumbing or localized sources.
PFAS is distinct from common water issues like hardness or iron staining
PFAS are synthetic chemicals often called "forever chemicals" because they persist in the environment. They differ significantly from commonly confused water problems such as hardness or iron staining, which affect taste, appearance, or plumbing but are unrelated to PFAS. Addressing PFAS specifically requires technologies designed to reduce these chemicals, which standard water softeners or filters targeting minerals cannot accomplish.
Public water system records provide system-wide PFAS occurrence, not individual household concentrations
The GWA Northern Water System in GU, serving its community through numerous connections, reports no EPA health-based violations in its water. However, monitoring from 2023 to 2025 detected various PFAS compounds including PFOA, PFOS, and PFHxS at concentrations documented by the EPA under the Unregulated Contaminant Monitoring Rule (UCMR5). These figures represent what was measured in the system as a whole, not in any one home’s water supply. Therefore, relying solely on system data cannot reveal your household’s specific PFAS levels.
Seasonal and multi-year data from 2023 to 2025 reveal variations in PFAS presence within the system
Between September 2023 and December 2025, repeated sampling detected PFOA in 9 out of 121 samples and PFOS in 37 samples, with levels varying over time. PFHxS was detected more frequently but at levels both below and occasionally above the forthcoming federal Maximum Contaminant Level (MCL) standards. This variability shows that PFAS concentrations can fluctuate seasonally and annually in the public water supply, emphasizing the importance of ongoing monitoring and household-specific testing.
The detected PFAS levels sometimes exceed forthcoming federal limits but this does not indicate a violation or unsafe water
Some PFAS detections in the GWA Northern Water System surpass the federal MCL set to take effect in 2024, such as PFOA and PFOS. However, these detections are measurements from monitoring and do not represent legal exceedances or health-based violations by EPA records. Rather, they signal the presence of these chemicals at certain concentrations, underscoring the need for treatment options tailored to reduce PFAS at the point of use if desired.
Households evaluating their treatment options benefit from considering these public data alongside certified laboratory testing of their own water. The C-Series PFAS Forever Chemicals Filter ships ready to configure and can reduce PFAS contaminants effectively, functioning as a specialized technology suited to address this complex problem. It can be part of your decision after understanding your specific water quality.
In summary, begin by ruling out common water issues and reviewing your water provider's PFAS data, then confirm your home’s PFAS levels with laboratory testing. Equipped with this knowledge, you can choose treatment equipment informed by your individual needs and the documented capabilities of specialized solutions like the C-Series system.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2025-12-18. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR5 monitoring (2023-2025) for GWA NORTHERN WATER SYSTEM (GU0000006), GU: 1210 results across 10 listed contaminants, 321 detections above the reporting level; 64 results above a 2024 federal MCL