An estimated 15,000 gallons of wastewater overflowed after a water main broke in Northeast Baltimore.
Officials say a valve left in the wrong position led to an overflow of 6 million gallons of diluted wastewater at a plant in Accokeek.
Officials say excessive rainfall led to a sewage overflow at a wastewater pumping station in Fort Washington.
The Washington Suburban Sanitary Commission says a stuck log has caused a sewer overflow in Hyattsville.
The Carroll County Bureau of Utilities says about 150,000 gallons of partially treated wastewater have overflowed into Piney Run Creek at the Hampstead Wastewater Treatment plant.