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  Individual Results, in units of ppt   Running Annual Averages, in units of ppt
Patuxent Water Filtration Plant PFOA PFOS PFHxS PFNA GenX PFBS   PFOA PFOS PFHxS PFNA GenX Hazard Index
(unitless) 
EPA Limit               4.0 4.0 10 10 10 1
Practical Quantitation Level 4 4 3 4 5 3              
Health-based Water Concentration     10 10 10 2000            
                         
Q1 2020 1.9 nd nd nd nd nd              
Q2 2020 nd nd nd nd nd nd              
Q3 2020 2.0 nd nd nd nd nd              
Q4 2020 2.1 nd nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q1 2021 nd nd nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q2 2021 nd nd nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q3 2021 2.0 nd nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q4 2021 nd nd nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q1 2022 nd nd nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q2 2022 nd nd nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q3 2022 2.4 2.6 nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q4 2022 2.0 nd nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q1 2023 nd nd nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q2 2023 nd nd nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q3 2023 nd nd nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
                           
Potomac Water Filtration Plant PFOA PFOS PFHxS PFNA GenX PFBS   PFOA PFOS PFHxS PFNA GenX Hazard Index
(unitless) 
EPA Limit               4.0 4.0 10 10 10 1
Practical Quantitation Level 4 4 3 4 5 3              
Health-based Water Concentration     10 10 10 2000            
                         
Q1 2020 nd nd nd nd nd nd              
Q2 2020 1.9 2.3 nd nd nd nd              
Q3 2020 2.1 2.1 nd nd nd nd              
Q4 2020 2.3 2.6 nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q1 2021 nd 2.2 nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q2 2021 3.0 3.2 nd nd nd 2.1   0.0 0.0 0.0 0.0 0.0 n/a
Q3 2021 2.6 2.9 nd nd nd 2.5   0.0 0.0 0.0 0.0 0.0 n/a
Q4 2021 nd nd nd nd nd 2.2   0.0 0.0 0.0 0.0 0.0 n/a
Q1 2022 nd nd nd nd nd nd   0.0 0.0 0.0 0.0 0.0 n/a
Q2 2022 3.1 3.3 nd nd nd 3.0   0.0 0.0 0.0 0.0 0.0 n/a
Q3 2022 5.3 6.2 3.0 nd nd 3.5   1.3 1.6 0.8 0.0 0.0 0.1
Q4 2022 2.7 2.1 nd nd nd 2.7   1.3 1.6 0.8 0.0 0.0 0.1
Q1 2023 nd nd nd nd nd nd   1.3 1.6 0.8 0.0 0.0 0.1
Q2 2023 nd nd nd nd nd nd   1.3 1.6 0.8 0.0 0.0 0.1
Q3 2023                          

Annual average as of April 102024

nd stands for not detected.

The running annual average is an average of results from the most recent four quarters. The practical quantitation level (PQL) for each compound is defined by EPA as the lowest level that can be reliably measured. When results are below EPA's PQL, the regulation uses a zero for that result in the average.

The Hazard Index is a calculation used to account for risk from mixtures of contaminants. It is calculated when there are detections of two or more PFHxS, PFNA, GenX, and PFBS.

2024 2023 2022 2021 2020
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Last Modified: July 18, 2024, 10:26 am EDT