Join us for another seminar in our Water Research Series, featuring experts examining emerging challenges shaping water, wastewater, public health, and infrastructure.

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Description: Per- and polyfluoroalkyl substances (PFAS) are persistent contaminants of increasing concern in drinking water because of their mobility, environmental persistence, and potential health effects. This study evaluates PFAS occurrence across Maryland’s drinking water systems using 1,895 samples collected between 2020 and 2025, representing 876 public water system identifiers across all 24 counties. In addition, 52 drinking water samples were collected in 2026 to extend the statewide assessment. The dataset includes raw and finished water from groundwater, surface water, and mixed sources. PFOA was the most frequently detected compound, followed by PFBS, PFOS, and PFHxS, while PFNA and HFPO-DA were detected less often. PFAS occurrence varied substantially by system, source-water type, and location, highlighting heterogeneous contamination across Maryland. Differences between raw and finished water further underscore the importance of treatment configuration and PFAS-specific behavior. These findings support continued statewide monitoring, treatment optimization, and prioritization of drinking water systems requiring further attention.

• Managers, owners, and operators of water systems serving less than 10,000 people, or wastewater systems with an average daily flow of less than 1 million gallons
• Decision-makers for water and wastewater utilities, including mayors, finance officers, utility managers, public works directors, city councilors, board members, tribal council members, and clerks
• Consultants and technical assistance providers serving water and wastewater systems

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