This week, your household faces a decision: selecting the best approach to address PFAS, or per- and polyfluoroalkyl substances, sometimes called 'forever chemicals,' present in Salt Lake County water.
Firefighting Foam, Textile Finishing, and Landfill Sources: Which Fit Salt Lake's PFAS Profile?
PFAS compounds often originate from specific industrial or disposal activities such as firefighting foam usage, textile finishing, and landfill leaching. The Salt Lake City Water System draws from surface water sources and serves nearly 384,000 people. The area’s monitoring data, collected as part of the EPA’s UCMR5 survey, reflect the cumulative impact of regional sources but do not specify contributions from any single activity.
2024 Federal MCLs: Which Fluorinated Compounds Are Regulated Now?
The federal government set maximum contaminant levels (MCLs) starting in 2024 for several PFAS compounds. Among these, perfluorooctanoic acid (PFOA) has an MCL of 4.0 nanograms per liter (ng/L), equal to 4 parts per trillion (ppt), while perfluorooctane sulfonic acid (PFOS) also has a 4.0 ng/L limit. Perfluorohexane sulfonate (PFHxS) is regulated at 10 ng/L. Salt Lake City's system monitoring found some detections of PFOS and PFHxS above reporting levels but below the federal limits. Other compounds in the survey, such as perfluorononanoic acid (PFNA) and hexafluoropropylene oxide dimer acid (HFPO-DA), showed no detections above reporting thresholds.
Why Aesthetic Secondary Standards Differ from Health-Based Limits for PFAS
Aesthetic secondary standards often govern taste, color, or staining potential but do not apply to PFAS because these substances lack sensory characteristics typical of such standards. Health-based federal MCLs, on the other hand, reflect risk assessments for long-term exposure. Thus, when evaluating PFAS data, it’s crucial to focus on these health-based thresholds rather than aesthetic considerations.
How Sample Depth, Well Depth, or Source Type Influence What to Expect About PFAS
Salt Lake City’s surface water source influences PFAS presence differently than groundwater might. Surface water can integrate contaminants from upstream land use, affecting the types and levels detected. Depth of sample collection and well characteristics in groundwater systems are critical for understanding PFAS variation but are not applicable here. Homeowners should test their own water directly for accurate PFAS measurements since regional data reflect system-wide averages.
Differences Between UCMR5 and UCMR3 Surveys: Compounds and Detection Levels
The UCMR5 sampling, conducted between 2023 and 2025, includes a broader array of PFAS compounds with lower reporting limits than the previous UCMR3 survey. This increased sensitivity means detections in UCMR5 do not imply higher contamination but rather improved measurement capability. Not all compounds monitored in UCMR5 had federal MCLs established; hence, understanding which compounds currently have enforceable limits is key to prioritizing treatment efforts.
In summarizing, homeowners in Salt Lake County must recognize the distinction between system-wide PFAS monitoring data and individual household water quality. Testing personal water supplies is necessary to assess actual PFAS concentrations. The Autotrol PFAS Forever Chemicals Filter provides a direct, documented means to reduce PFAS levels effectively, offering a solution ready to configure at home. This evaluation of regional data, regulations, and treatment technologies supports making an informed choice between technical options.
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