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New Maryland Septic Regulations


On June 13, 2014, Bill Brennan, Rick Curry, Carl Thomas and Mike Norris of B & R  Design Group attended a Training Session for BAT Septic System Design presented by the Maryland Society of Surveyors.

What is BAT? BAT stands for ìBest Available Technology for Removal of Nitrogen. The Maryland Code of Regulations (COMAR) 26.04.02 is now law that states that no on-site sewage disposal systems shall be installed unless the disposal system utilizes BAT.

This applies to:

  • New Construction, in either the Chesapeake Bay Watershed or the Atlantic Coastal Bays Watershed
  • New Construction in any watershed of a nitrogen impaired body of water, or
  • A replacement system to serve a property in either the Chesapeake Bay critical area or the Atlantic Coastal Bays critical area.

What does all this regulation mean? It means that new septic systems in Maryland will require an additional treatment system consisting of a multi-chamber tank that includes a pre-treatment trash chamber, an aeration chamber and a pump chamber prior to discharging waste to the approved drain field. A blower is required for the aeration chamber to supply oxygen for the aerobic process. This blower and the pump will require the installation of a dedicated electrical circuit. Additional costs, you ask? For a typical 4-5 bedroom residence, $5,000-$10,000 is the range being estimated. For larger non-residential systems, the costs will be much higher.

B & R Design Group in Frederick, MD can prepare a BAT design for your specific need. Please contact us if you have questions about your project.

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