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Permit Services is open Monday-Friday, 7 a.m.-4 p.m. except Wednesdays, 7 a.m.- Noon. Call us at 301-206-4003 for more information.

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 Individual Results, in units of ppt Running Annual Averages, in units of ppt
Patuxent Water Filtration PlantPFOAPFOSPFHxSPFNAGenXPFBS PFOAPFOSPFHxSPFNAGenXHazard Index
(unitless) 
EPA Limit       4.04.01010101
Practical Quantitation Level443453       
Health-based Water Concentration  1010102000      
             
Q1 20201.9nd<1.8ndnd<1.8       
Q2 2020ndnd<1.9ndnd<1.9       
Q3 20202.0ndndndndnd       
Q4 20202.1ndndndndnd 0.00.00.00.00.00.0
Q1 2021ndndndndndnd 0.00.00.00.00.00.0
Q2 2021ndndndndndnd 0.00.00.00.00.00.0
Q3 20212.0ndndndndnd 0.00.00.00.00.00.0
Q4 2021ndndndndndnd 0.00.00.00.00.00.0
Q1 2022ndndndndndnd 0.00.00.00.00.00.0
Q2 2022ndndndndndnd 0.00.00.00.00.00.0
Q3 20222.42.6ndndndnd 0.00.00.00.00.00.0
Q4 20222.0ndndndndnd 0.00.00.00.00.00.0
Q1 2023ndndndndndnd 0.00.00.00.00.00.0
Q2 2023ndndndndndnd 0.00.00.00.00.00.0
Q3 2023ndndndndndnd 0.00.00.00.00.00.0
Q4 2023ndndndndndnd 0.00.00.00.00.00.0
Q1 2024ndndndndndnd 0.00.00.00.00.00.0
Q2 2024ndndndndnd2.4 0.00.00.00.00.00.0
Q3 2024ndndndndndnd 0.00.00.00.00.00.0
             
Potomac Water Filtration PlantPFOAPFOSPFHxSPFNAGenXPFBS PFOAPFOSPFHxSPFNAGenXHazard Index
(unitless) 
EPA Limit       4.04.01010101
Practical Quantitation Level443453       
Health-based Water Concentration  1010102000      
             
Q1 2020ndndndndndnd       
Q2 20201.92.3<1.7ndnd<1.7       
Q3 20202.12.1ndndndnd       
Q4 20202.32.6ndndndnd 0.00.00.00.00.00.0
Q1 2021nd2.2ndndndnd 0.00.00.00.00.00.0
Q2 20213.03.2ndndnd2.1 0.00.00.00.00.00.0
Q3 20212.62.9ndndnd2.5 0.00.00.00.00.00.0
Q4 2021ndndndndnd2.2 0.00.00.00.00.00.0
Q1 2022ndndndndndnd 0.00.00.00.00.00.0
Q2 20223.13.3ndndnd3.0 0.00.00.00.00.00.0
Q3 20225.36.23.0ndnd3.5 1.31.60.80.00.00.1
Q4 20222.72.1ndndnd2.7 1.31.60.80.00.00.1
Q1 2023ndndndndndnd 1.31.60.80.00.00.1
Q2 2023ndndndndndnd 1.31.60.80.00.00.1
Q3 2023ndndndndndnd 0.00.00.00.00.00.0
Q4 2023ndndndndndnd 0.00.00.00.00.00.0
Q1 20242.72.6ndndnd2.2 0.00.00.00.00.00.0
Q2 20242.53.0ndndnd2.4 0.00.00.00.00.00.0
Q3 20243.13.32.0ndnd2.4 0.00.00.00.00.00.0

Annual average as of November 2024

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. The Hazard Index maximum contaminant level (MCL) applies when there are detections of two or more of PFHxS, PFNA, GenX, and PFBS above the practical quantitation limit (PQL).

20242023202220212020
Q1 Q1MarchMarchJanuary
Q2Q2JulyJulyApril
Q3Q3SeptemberSeptemberNovember
 Q4DecemberDecemberDecember
Last Modified: December 11, 2024, 2:01 pm EST