WSSC Responds to On-Property Wastewater Overflow at Piscataway Water Resource Recovery Facility

Significant Rainfall Contributed to High Wastewater Flows

| News Release



Drinking Water System NOT Impacted

Laurel, Md. – May 21, 2018 – WSSC experienced an on-property wastewater overflow at its Piscataway Water Resource Recovery Facility formerly known as a wastewater treatment plant) on Farmington Road in Accokeek. The overflow started at 10:47 p.m. on Friday, May 18 and ended today, May 21 at 1:01 p.m.

It is important to note that WSSC’s water and wastewater systems are separate. This overflow is NOT affecting WSSC’s drinking water.

Due to last week’s significant rainfall, WSSC diverted partially treated wastewater to an on-property lined containment pond. The overflow occurred when the wastewater flowed out of the lined containment pond into an adjacent unlined containment pond. These onsite ponds were specifically designed to keep overflows on property during heavy rain events. Working as designed, no wastewater left the plant’s property. However, because the partially treated wastewater entered the unlined pond, it is considered an overflow.

Early calculations indicate the overflow was approximately 11 million gallons. WSSC is now in the process of diverting the partially treated wastewater from the unlined pond back to the plant for full treatment.

As a precaution, WSSC has posted signs around the area and appropriate notifications have been made to the Maryland Department of the Environment and the Prince George’s County Health Department. 

WSSC is committed to protecting the health of the public and the environment. With more than 5,500 miles of sewer mains throughout its service area, WSSC appreciates notifications from citizens if a sewer overflow or water main break is suspected. Citizens can call WSSC’s 24-hour Emergency Call Center at 301-206-4002 to report water or sewer emergencies in Prince George’s or Montgomery counties.  Customers can also report emergencies via email at and those customers who have smart phones can report emergencies using the WSSC Mobile App.

WSSC Water is the proud provider of safe, seamless and satisfying water services, making the essential possible every day for our neighbors in Montgomery and Prince George’s counties. We work to deliver our best because it’s what our customers expect and deserve.

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