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A Montgomery Parks specialist surveys a local stream and moves netted fish into a bucket for observation
Montgomery Parks regularly survey the county’s waterways, which are endangered by polluted stormwater. (Gianna Gronowski / ҹֱ)

Increased development, stormwater runoff threaten MoCo creeks and wildlife

Montgomery Parks and environmentalist groups warn of development’s damaging effects and ask residents to help curb the lasting corruption stormwater runoff has on local waterways and wildlife.

Expanded development in residential and urban areas throughout ҹֱ County in the last decade have negatively impacted local streams and wildlife, according to from Montgomery Parks and nonprofit .

Rainfall on impervious surfaces does not soak into the ground. Parking lots, rooftops and driveways allow for the collection of this water, called runoff. Stormwater runoff flows either directly into streams or by way of storm drain pipes and stormwater management facilities, carrying contaminants with it, according to Montgomery Parks.

Runoff water poses more of a threat to residents than just soggy grass and flooding in the streets.

from damaged and burst drain pipes have been a in ҹֱ County, according to water and wastewater utilities WSSC Water.

Seneca Creek in Germantown saw the same section of storm drain pipe damaged a year after the in 2020, dumping thousands of gallons of sewage and contaminated water into the environment.

WSSC Water tap water was still safe to drink in each instance.

Investigations by WSSC Water have not yet released new insights into the state of the 11,000 miles of storm drain pipes in ҹֱ County.

Rachel Gauza Gonert stands in Maydale Nature Center in waders and hold water surveying equipment.
Principal Natural Resources Specialist Rachel Gauza Gonert demonstrates the use of a backpack electrofishing unit, which allows parks employees to survey ҹֱ County’s streams. A small electrical current is discharged into the water, temporarily stunning the fish just long enough for a surveyor to net them. (Gianna Gronowski / ҹֱ)

Urban consequences

Most households in ҹֱ County are within half a mile of one of the 1,500 local streams with the potential for stormwater damage, according to Montgomery Parks.

Montgomery Parks employees regularly survey waterways for the oxygen level, pollution contaminants and presence of aquatic life to determine the health of the stream. Each waterway is then assigned a rating for its condition.

Montgomery Parks maintains where residents can find out the rating for their local stream.

A map showing ҹֱ County has colored in districts, ranging colors from blue to red to show stream health condition.
ҹֱ County’s watershed map shows how urban areas like Rockville frequently have poor stream health in comparison to more rural areas like Germantown. (Courtesy of Montgomery Parks)

Bethesda Green functions to improve green living in urban areas. A report by the nonprofit stated that in a forested stream like Newaukum Creek, water flow is slower to rise. An urban waterway such as Mercer Creek has higher rates of erosion and flash flooding.

Ryan Zerbe, Watershed Outreach Planner for the ҹֱ County Department of Environmental Protection, focuses on improving water quality and stream health. Zerbe said 55% of stormwater in an urban area becomes runoff, equivalent to seven Olympic sized swimming pools, compared to the 25% in a forested area.

A graphic shows the differences between urban and natural environments and how they affect the percentage of runoff water.
Runoff is more significant in urban areas as opposed to undeveloped, natural environments. (Courtesy of Philadelphia Water Department and ҹֱ County Department of Environmental Protection)

Tree canopies are highly important for stormwater, according to Zerbe. Roots keep the soil in place. Once impervious tree canopy coverage is lost, it is “very difficult to get reestablished,” Zerbe said.

Runoff water also increases stream bank erosion, according to Zerbe. There exists a natural process of erosion, but “we certainly accelerated that by the type of building and development that we do,” Zerbe said.

ҹֱ County streams in poor condition face erosion of up to 15 feet, according to Bethesda Green. Development has reduced Sligo Creek to just 26% of what it was 125 years ago.

A photo of a heavily eroded stream in ҹֱ County.
Current conditions of ҹֱ County’s streams show extreme erosion. (Courtesy of Bethesda Green)

Adam Ortiz, Director of Montgomery Parks Department of Environmental Protection, has overseen watershed regulation and stormwater management since 2012. Ortiz was by the Biden administration to serve as the Regional Administrator for EPA Region 3.

Pollution on land is carried into the waterways by stormwater runoff, according to Ortiz.

“The health of the water is directly related to the health of the land. If there’s bad stuff on the land, when it rains, it will get into the water,” Ortiz said.

Pollution like trash, oil spills and improper disposal of pet waste all threaten the water quality of local streams and rivers.

Adam Ortiz speaks at an event hosted by the Department of Environmental Protection.
Director of Montgomery Parks Department of Environmental Protection Adam Ortiz introduced a new campaign called “Critters in Crisis,” aimed to encourage the public to help protect ҹֱ County’s waterways and wildlife. (Gianna Gronowski / ҹֱ)

Fighting back

Montgomery Parks a new campaign called “Critters in Crisis.”

“This is basically ҹֱ County’s version of endangered species here in our region,” Ortiz said. “What we find is that there’s life all around us. And sometimes it’s not quite visible, but it’s certainly there.”

Five aquatic creatures make up the list of at risk species in ҹֱ County’s waterways. The acuminate crayfish, giant stone fly, marbled salamander, American eel and yellow lance mussel are all at great risk due to polluted runoff stormwater emptying into the streams.

A black salamander with yellow chevrons down its back attempts to scale the wall of its tank.
The marbled salamander is one of the five at risk species identified by Montgomery Parks Department of Environmental Protection. (Gianna Gronowski / ҹֱ)

Each creature is important to Maryland’s ecosystem and in danger of disappearing, according to ҹֱ County senior water quality specialist Ken Mack.

For instance, the yellow lance mussel helps filter the Patuxent River basin. The mussels are endemic to Maryland, Virginia and North Carolina, meaning they cannot live anywhere else. Mack said only about 10 of these federally protected mussels have been seen within the last decade. The mussels had not previously been seen in the Patuxent River in over 50 years, according to Mack.

Two Montgomery Parks employees show crayfish to an onlooking group of children.
Montgomery Parks specialists Rachel Gauza Gonert and Ken Mack show the endangered and endemic acuminate crayfish to kids outside the Maydale Nature Classroom. (Gianna Gronowski / ҹֱ)

“There are many ways the public can help protect the streams and wildlife, including picking up litter and pet waste and volunteering for park cleanups,” said Mike Riley, director of Montgomery Parks.

Montgomery Parks and Bethesda Green sponsor a number of incentive programs to help protect the local waterways. Residents are being encouraged to consider participating in free programs that award cash rebates, like and .

Gianna Gronowski

Gianna Gronowski

Graduate Journalism student at American Univeristy, '22. Highlighting politics, human rights, and anything else that sparks interest.

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