When evaluating a laboratory test report for PFAS—per- and polyfluoroalkyl substances—it's important to understand the vocabulary and units used. Concentrations are typically listed in nanograms per litre (ng/L), equivalent to parts per trillion (ppt). Reports often mention specific PFAS compounds such as PFOA, PFOS, PFHxS, and others, detailing whether these substances were detected and at what levels. The presence of a measurement above a reporting level is a detection, not a violation or indicator of safety concern by itself.
Why a Granular Carbon Bed and an Ion-Exchange Resin Are Documented Differently for PFAS
Water treatment technologies addressing PFAS function through different mechanisms. Granular activated carbon beds adsorb certain fluorinated compounds, capturing them physically, while ion-exchange resins chemically bind target PFAS molecules based on their charge. These differences affect performance specifics like which PFAS are reduced and under what conditions. Product documentation distinguishes these methods carefully to guide appropriate use. The C-Series PFAS Forever Chemicals Filter employs a documented approach integrating such technologies, optimized to reduce a broad spectrum of PFAS compounds.
The Order to Rule Things Out: From Cheapest Check to Laboratory Test
To understand if your household water is affected by PFAS, start by reviewing public water system records for your area, which represent aggregated data rather than your home's specific water. Next, identify potential local sources such as firefighting foam use or industrial activities that might elevate PFAS levels. Consider inexpensive point-of-use screening kits if available, though these have limitations in sensitivity. Ultimately, a certified laboratory test of your home's water supply is needed to establish actual PFAS concentrations at your tap.
How Public-System Records Differ from Private-Well Testing in What They Establish
Public water system data reflect the quality of large-scale water treatment and distribution over an extensive network; it is not a direct measure of water quality inside any individual household plumbing. These records show trends and maximum detected concentrations within the sampled system. In Salt Lake City Water System's recent monitoring (October 2023–October 2024), PFAS compounds were detected at low levels with no more than one detection exceeding the federal maximum contaminant level (MCL) for PFOS at 4.0 ng/L (parts per trillion). Private well water can vary substantially and requires separate testing to confirm individual conditions.
What 'Detected,' 'Median,' and 'Range' Mean in the Sampling Record on This Page
The sampling record for Salt Lake City Water System reports 52 samples for each PFAS compound. 'Detected' means a concentration was measured above the laboratory's reporting threshold; it is not a violation or safety indication. The 'median' represents the middle concentration value among detections, giving a sense of central tendency. The 'range' describes the lowest to highest detected values over the 12-month period. For example, PFOS was detected once above 0.004 µg/L (4.0 ng/L), with a highest recorded 0.0071 µg/L (7.1 ng/L). This data documents occurrence, not individual exposure or health risk.
A Worked Example: Reading the Record's Median and Range as a Homeowner Would
If you consider PFHxS, detected once above the reporting limit of 0.003 µg/L with a maximum concentration of 0.0182 µg/L (18.2 ng/L), you see that most samples did not detect the compound, and the single detection was below the anticipated federal MCL of 10 ng/L. This indicates occasional presence but not consistent or widespread high-level contamination. Your home's water may be different—only a direct test can confirm your actual PFAS levels.
How Seasonal or Multi-Year Variation Shows in the Record (Dates and Ranges Given)
The reported PFAS data for Salt Lake City covers the period from October 2, 2023, to October 9, 2024. Sampling over several months captures potential seasonal variations in source water. Variability in PFAS detections can arise from factors such as surface water changes or source inputs fluctuating with storm events or industrial activities. However, this dataset shows relatively stable low-level PFAS presence across the year without major spikes, suggesting consistent water quality in terms of these compounds.
What You Should NOT Conclude from Area Data
It is important not to assume that area-wide data directly reflect your household’s water supply. Detections in the public system do not mean your home’s water contains the same levels. Likewise, a lack of detection in the system record does not guarantee absence in private sources or plumbing. Only specific laboratory testing of your own water can provide definitive information. The monitoring results do not establish health status for individuals but rather document the presence and range of PFAS chemical concentrations in the system. For households wishing to address potential PFAS concerns proactively, the C-Series PFAS Forever Chemicals Filter ships ready to configure and is designed as a documented option for reducing these 'forever chemicals' from residential water supplies.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2024-10-09. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR5 monitoring (2023-2025) for SALT LAKE CITY WATER SYSTEM (UTAH18026), UT: 520 results across 10 listed contaminants, 4 detections above the reporting level; 2 results above a 2024 federal MCL