CORRECTION: Air Release Valve Break on Sewer Main at Hoyles Mill Wastewater Pumping Station

Leak Contained to Station

| News Release



Laurel – June 14, 2016 – On June 13, a two inch air release valve (ARV) on a 14 inch pressurized sewer main broke near the Hoyles Mill Wastewater Pumping Station (WWPS) in Montgomery County. Yesterday it was reported that the break was on the 14 inch sewer main. 

Investigation by WSSC confirmed that the ARV break occurred at 2:30 am on June 13, and was stopped at 3:00 pm when the stations pumps were turned off to facilitate repairs. It is estimated that 9,440 gallons overflowed from the break site. 

The pumps continued to be shut down to facilitate the repair work that was completed at around 6:00 pm.  This has caused an additional overflow from the lowest manhole near the pump station that started at 5:08 pm and ended at 6:08 pm, estimated to be approximately 10,000 gallons. The total overflow volume is 19,440 gallons.

The untreated wastewater did not enter any bodies of water. Appropriate notifications have been made to the Maryland Department of the Environment and the Montgomery County Health Department.

WSSC is committed to protecting the health of the public and the environment. With more than 5,400 miles of sewer mains throughout its service area, WSSC appreciates notifications from citizens if a sewer back up is suspected. Citizens can call 301-206-4002 at any time to report water or sewer emergencies in Prince George’s or Montgomery counties.  


For 100 years, WSSC has proudly served the citizens of Prince George’s and Montgomery counties – providing drinking water that has always met strict Safe Drinking Water Act standards and protecting the environment through vital water resource recovery services. Our vision is to be THE world-class water utility, where excellent products and services are always on tap.


Last Modified: