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301-206-4001 
Weekdays: 8:00 am - 6:00 pm 
Email: Customer Service
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Weekdays: 8:00 am - 5:00 pm
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301-206-4001
24 hours, 7 days/week
Toll-Free: 800-828-6439
TTY: 301-206-8345
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WSSC Water offers five ways to pay your bill: Online, by Phone, by Mobile App, by Drive-Thru, by Mail and in Person. Go to Pay My Bill for more information.

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If you're experiencing a water emergency, such as a broken water main, or a sewer emergency, report it using our mobile app, email the Emergency Services Center, or call us at 301-206-4002.

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We're here to help. Eligible residential customers may start a pay plan or learn more about all of the financial assistance resources. Get started by going to Flexible Pay Plans.

Financial Assistance Programs

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.

Go to ePermitting

Learn More about Permit Services
 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 Level443543       
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
Q4 20242.3nd2.7ndnd2.1 0.00.00.00.00.00.0
Q1 20251.8ndndndnd2 0.00.00.00.00.00.0
             
Potomac Water Filtration PlantPFOAPFOSPFHxSPFNAGenXPFBS PFOAPFOSPFHxSPFNAGenXHazard Index
(unitless) 
EPA Limit       4.04.01010101
Practical Quantitation Level443543       
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
Q4 20242.82.1ndndnd2.6 0.00.00.00.00.00.0
Q1 20251.81.9ndndnd2.4 0.00.00.00.00.00.0

Annual average as of April 2025

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).

202520242023202220212020
 Q1Q1Q1Q1Q1
 Q2Q2Q2Q2Q2
 Q3Q3Q3Q3Q3
 Q4Q4Q4Q4Q4
Last Modified: April 28, 2025, 1:47 pm EDT