Comparing PFAS Records and Treatment Options in St. Mary's County for Residential Water
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Federal Standards for PFAS in St. Mary's County Water System
The Patuxent Naval Air Station public water system serving St. Mary's County reports no detections of several key per- and polyfluoroalkyl substances (PFAS) above their respective federal maximum contaminant levels (MCLs) set for 2024. Specifically, compounds such as PFOA, PFOS, PFHxS, PFNA, and HFPO-DA have all tested below reporting thresholds with no exceedances of their MCLs ranging between 4.0 and 10 nanograms per liter (ng/L), equivalent to parts per trillion (ppt).
Regional PFAS Sources: Firefighting Foam, Textile Finishing, and Landfills
PFAS contamination in groundwater can originate from various sources, including aqueous film forming foam (AFFF) used in firefighting, textile finishing processes, and landfill leachate. The Patuxent Naval Air Station water system, primarily groundwater-sourced, reflects sampling consistent with low or non-detectable levels of these fluorinated compounds, suggesting limited influence from these common PFAS origins within the region or effective water system management.
Key Information to Gather Before Consulting on Treatment
Before seeking advice on PFAS water treatment, households should consider:
- Results from a recent water test specific to their own well or tap water, as system-wide data does not capture home-specific conditions.
- The daily volume of water used, to ensure any treatment solution aligns with household demand.
- Any known local PFAS sources or historical site contamination near their property.
Differences Between Public System Records and Private Well Testing
Government sampling data reflects aggregate or system-level water quality and not the concentration in individual homes. While the public water record for Patuxent Naval Air Station shows no detections above reporting levels for PFAS, private wells may have different profiles depending on local factors. A dedicated test of private water sources is necessary to confirm residential PFAS levels and inform treatment needs.
Assessing Treatment Capacity Relative to Household Water Use
Choosing the right class of PFAS treatment involves matching the equipment capacity to the volume of water used daily. Systems designed for residential-scale filtration with proven efficacy against PFAS can be selected based on typical household consumption, ensuring effective reduction without oversizing.
One such option is the C-Series PFAS Forever Chemicals Filter, which ships ready to configure for residential use and is engineered specifically to target various fluorinated compounds.
In summary, the current EPA record for the Patuxent Naval Air Station public water system serving St. Mary's County shows no PFAS detections above federal MCLs. This record is a system-wide overview and does not substitute for testing individual household water. For comprehensive water safety, direct testing and an appropriate water treatment solution aligned with household demand are recommended. This information is based on EPA UCMR5 monitoring data available through the EPA's Safe Drinking Water Information System (SDWIS) public records.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2025-09-16. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR5 monitoring (2023-2025) for PATUXENT NAVAL AIR STATION (NAVFAC-WASH) (MD0180022), MD: 260 results across 10 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level