East Shore District Health Department

Building/Property Additions

If your property is served by a septic system, prior to construction of any new additions on your property, including building additions, installation of pools, decks, patios, garages, etc., a B100a Review must be completed. In addition to proposals for additions, B100a applications are also used for building conversions (i.e., winterizing a seasonal home, converting an open porch into an all-season room) and property lot line splits. 

Steps for B100a Approval:

1. Submit B100a application with:

•  Plot plan showing existing buildings/structures on the property
•  Location of proposed addition/structure
•  Location of existing septic system
•  Location of well, if applicable
•  Area for future septic repair

2. Note that soil tests are required to determine a future septic repair area. If soil tests are not available for your property, soil testing will be required as part of the B100a approval.

3. A Sanitarian will review the application.

4. Approval notices will be sent to the building department.

If your property is connected to public sewers and served by a private well – the following application must be submitted for building additions/accessory structures Non-B100a Review

Separation Distances for Septic Systems:

• Deck/Patio to Septic: 5’
• In-ground pool to Septic: 25’
• Above-ground pool to Septic: 10’
• Building (including garage) with no drains to Septic: 10’
• Building (including garage) with foundation drains to Septic: 25’

Click the following link for a detailed list of separation distances: Septic Separation Distances.pdf