Government Experience

  • Assistant Attorney General, Maryland Department of the Environment

Bar Admissions

  • Maryland

Court Admissions

  • U.S. District Court for the District of Maryland
  • U.S. Court of Appeals for the Fourth Circuit


  • J.D., cum laude, Georgetown University Law Center, 1984
  • M.A., Johns Hopkins University, 1980
  • A.B., Georgetown University, 1977


  • American Bar Association
T +1 410.244.7587
F +1 410.244.7742

M. Rosewin Sweeney


Rosewin Sweeney is an environmental lawyer who focuses her practice on water pollution litigation and the permitting and environmental aspects of land use planning.

Rosewin's civil litigation experience includes enforcement actions for water pollution, oil spills, wetlands violations and violations of radiation and solid waste laws; challenges to regulations; challenges to county water and sewerage and solid waste management plans; and water appropriations permit and discharge permit disputes. She has extensive experience defending against citizen suits brought under the Clean Water Act and the Resource Conservation and Recovery Act.

She served nearly 18 years with the Maryland Department of the Environment prior to joining Venable. As Principal Counsel, she supervised 20 Assistant Attorneys General in advising and representing the agency in civil enforcement matters and in permit adjudications. She was personally responsible for significant civil litigation, including cases involving:

  • sanitary sewer overflows;
  • groundwater contamination;
  • water appropriation and supply disputes;
  • county water, sewer and solid waste management plans; and
  • oil spills and radioactive materials.

Rosewin has an extensive stormwater background, particularly in municipal and industrial stormwater permitting.

Representative Clients

Rosewin represents construction and real estate companies, hospitals, food production companies, utilities, oil companies, and municipalities in a variety of environmental matters, including enforcement actions, permitting disputes and the performance of due diligence.

Significant Matters

While Principal Counsel to the Maryland Department of  Environment, Rosewin was directly involved in negotiating three of the largest settlements for environmental violations ever collected under Maryland law.

She played a significant role in a lawsuit brought jointly by Maryland and the federal government that led to $200 million dollars in planned improvements to municipal water and sewer systems.