PFAS / Forever-Chemicals Removal System
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Understanding Nanograms per Liter in PFOA and PFOS Reports
Laboratory reports for perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), two common PFAS compounds, present results in nanograms per liter (ng/L), equivalent to parts per trillion (ppt). The precision to four decimal places (0.004 µg/L equals 4 ng/L) reflects the very low concentrations detectable by current advanced analytical methods. This level of detail is necessary because these substances occur at trace levels in water supplies. A result below the detection threshold, such as 0.004 µg/L, means the compound was not quantifiably measured above that cutoff, not that it is absent.
Federal Maximum Contaminant Levels (MCLs) for Fluorinated Compounds in 2024
As of 2024, the Environmental Protection Agency (EPA) has established federal MCLs for certain PFAS compounds in drinking water. PFOA and PFOS each have an MCL of 4 ng/L (0.004 µg/L), while PFHxS, PFNA, and HFPO-DA are assigned MCLs of 10 ng/L (0.010 µg/L). Other detected fluorinated substances such as PFBS, PFHxA, PFPeA, and PFBA currently do not have federal MCLs. It is important to note that detection of these compounds does not imply violation or health risk, only that measurement occurred above the method reporting level specified.
Sampling Scope and Data Confidence for Scott County's Public Water System
The Shakopee public water system record, which provides groundwater to approximately 47,000 residents in Scott County via 12,961 connections, includes 26 sample results per compound collected between January and August 2025. These samples represent water quality at the system level rather than individual households. A higher number of samples generally increases confidence in regional data. However, 26 readings per compound still represent a relatively limited sampling effort across all source wells, highlighting the importance of individual water testing for household-specific conditions.
Impact of Plumbing Materials and Age on Household PFAS Levels
The fluorinated compound concentrations reported stem from source groundwater and treatment at the water system. However, household plumbing materials and the age of pipes and fixtures can influence measured PFAS levels. Some plastic or rubber components may adsorb or leach trace amounts differently, affecting point-of-use water quality. Therefore, evaluating plumbing factors separately from source water contamination is critical to understand potential exposure at the tap.
Differences Between UCMR5 and UCMR3 PFAS Monitoring Surveys
The EPA's Unregulated Contaminant Monitoring Rule (UCMR) surveys track emerging contaminants such as PFAS. The most recent UCMR5 (2023–2025) survey for Shakopee's system includes a broader range of PFAS compounds with lower reporting levels compared to the earlier UCMR3 survey conducted in 2013–2015. UCMR5's expanded scope and tighter detection limits allow identification of additional fluorinated substances like PFBA and PFHxA that were not included or measured at comparable sensitivity previously, offering a more comprehensive profile of 'forever chemicals' in the water supply.
Recommended Water Test to Confirm Household PFAS Levels
Given these regional findings and variables, homeowners considering treatment options should obtain a certified laboratory test specific to their household water. This test should include the PFAS compounds covered by the latest federal standards, particularly PFOA and PFOS, to establish the exact concentrations at the tap. A result with detected levels below or near federal MCLs would generally indicate no regulatory exceedance. For those seeking removal of measurable fluorinated compounds, equipment such as the Fleck PFAS Forever Chemicals Filter ships ready to configure and is documented to address a range of PFAS substances effectively. Ultimately, a precise household water test result guides informed decisions on treatment technology selection and necessity.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2025-08-18. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR5 monitoring (2023-2025) for Shakopee (MN1700009), MN: 260 results across 10 listed contaminants, 46 detections above the reporting level; compared with the applicable federal MCL, none above