Shortly after joining Potomac Riverkeeper, Inc. in 2009, Brent Walls now works as the Upper Potomac Riverkeeper and is responsible for defending the public trust of the rivers and streams in the Upper Potomac by advocating for clean water and ensuring the the virtues of the Clean Water Act are enforced. Brent Walls has been an advocate for clean water for over a decade. With an Environmental Science background in fresh water ecology, Brent has brought a valuable scientific perspective to Potomac Riverkeeper since 2009. His experience in water quality sampling has ensured defensible enforcement actions and has been a unique advising asset with local watershed groups. Brent’s love of maps and proficiency with Geographical Information Systems has inspired the development of Water Trail maps in the Upper Potomac and has provided PRK with valuable interactive web maps and the creation of a mobile application to report water pollution.