©2019 BY CHARLES P. JOHNSON & ASSOCIATES, INC.

Construction Management and Inspection Services

CPJ has been the leader in providing inspection services to local jurisdictions to meet their National Pollutant Discharge Elimination System (NPDES) regulations. We are certified and experienced in the design and inspection of all types of BMPs and BMP categories including traditional above and below ground quantity and quality control facilities as well as more contemporary Environmental Site Design (ESD) and Low Impact Development (LID) practices. We have completed several thousand best management practice (BMP) evaluations for other municipalities and agencies including:


  • Howard County, MD

  • Baltimore County, MD

  • Loudoun County, VA

  • Arlington County, VA

  • City of Gaithersburg, MD

  • City of Rockville, MD

  • The Columbia Association

  • M-NCPPC

  • National Institute of Standards and Tech.

  • Potomac Electric Power Company

  • Johns Hopkins University

  • City of Greenbelt