Septic System

An on-site sewage (septic) system permit is required for the installation, alteration or repair of any part of a septic system. If a building is served by a septic system and construction, alterations or a change of use of the building is proposed, then a septic system permit may also be required.


Whether you are constructing new or adding bedrooms, plumbing fixtures, floor area or changing a use of a building, you will be required to building a new septic system, add on to the existing septic system or confirm that the existing septic system is sized appropriately, contact the Building Division by email or call 905-476-4301.

  • Lake Simcoe Region Conservation Authority (LSRCA): Approval from the LSRCA is needed if you are constructing in its regulated area. LSRCA regulations may restrict construction. Consult LSRCA's mapping tool to see if your property is regulated, or call 905-895-1281
  • Contact the Development Engineering Division by email for information regarding a Site Alteration and Entrance Permit. This ensures that the grading and drainage of your property will not negatively affect a neighbouring property. This approval will be needed before building permit issuance.


It is the responsibility of the owner or the authorized agent to submit a complete application that includes the designed system exactly as the system is to be installed or altered.

  • Design drawings
    • Must be prepared by a competent designer
    • Must be drawn to scale and accurately and neatly drawn
    • May be made by the owner if the owner takes responsibility for the design (Note: all designers must demonstrate a level of design competency)
    • May require a designer with specific credentials (i.e. P.Eng.) for complicated or specialized designs

When applying for a septic system permit we require:

Contact the Building Division by email to request more information or to clarify anything regarding construction of a building.

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Contact Us

26557 Civic Centre Rd,
Keswick, ON  L4P 3G1

T: 905-476-4301 / 705-437-2210
F: 905-476-8100

Hours of Operation

Monday to Friday
8:30 a.m. to 4:30 p.m.