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Septic Regulations in Alberta: Setbacks, Permits and Tank Sizes
Private sewage systems in Alberta are built to the Alberta Private Sewage Systems Standard of Practice 2021, published by the Safety Codes Council and adopted under the Private Sewage Disposal Systems Regulation (Alberta Regulation 229/97) (Government of Alberta). This page summarizes the rules an acreage buyer or owner runs into most often. It is a plain-language guide, not the code: your installer and permit issuer work from the full Standard of Practice, and your municipality may add its own requirements.
Who can get a permit
To obtain a permit to design and install a private sewage system, a contractor must hold a current certificate of competency from the Government of Alberta. There are two: a full Private Sewage certificate for all system types, and a Restricted certificate for holding tanks only (alis). Whether an owner can take out a homeowner permit for their own house is up to the local permit issuer, so ask your municipality first.
Setback distances
Setbacks are set component by component, in separate articles of the Standard of Practice. The minimum distances are:
Septic tank or holding tank (Articles 4.2.2.1 and 3.1.2.1)
- 10 m from a water source or water well
- 10 m from a water course
- 1 m from a property line
- 1 m from a building
Treatment field (Article 8.2.2.1)
- 15 m from a water source or water well
- 100 m from a licensed municipal water well
- 15 m from a water course
- 1.5 m from a property line
- 10 m from a basement, cellar or crawl space
- 5 m from a building with a permanent foundation but no basement
- 1 m from a building without a permanent foundation
- 5 m from a septic tank or packaged treatment plant
Treatment mound (Article 8.4.2.1)
- 15 m from a water source or water well
- 100 m from a licensed municipal water well
- 15 m from a water course
- 3 m from a property line
- 3 m from a septic tank
- 10 m from a basement, and 10 m from a building without a basement
Packaged sewage treatment plant (Article 5.2.2.1)
- 10 m from a water source or water well
- 10 m from a water course
- 6 m from a property line, or 1 m with odour control where peak flow is under 5.7 cubic metres a day
- 1 m from a building
Open discharge (Article 8.7.2.1)
- 50 m from a water source or water well
- 45 m from a water course
- 90 m from a property line
- 45 m from a building
Open discharge is not allowed in a quarter section where more than four parcels have been subdivided out (Article 8.7.2.2).
Lakes, rivers and streams (Article 2.1.2.4)
The soil-based treatment component must be at least 90 m from the shore of a lake, river, stream or creek. That distance can be reduced where a building sits between the system and the water.
Minimum septic tank size
Table 4.2.2.2 sets the minimum working capacity of a septic tank serving a dwelling by bedroom count:
- 1 to 3 bedrooms: 3,360 L
- 4 bedrooms: 4,260 L
- 5 bedrooms: 5,220 L
Design flow follows the bedrooms in the house, not how many people live there today.
What these rules mean when you buy land
- Measure before you budget. A small or narrow lot, a well in the wrong place, or a creek along one side can rule out a conventional field and push you to a mound or treatment plant. See what each type costs.
- Find the well first. The 10 m tank and 15 m field setbacks to a water well are the ones that most often decide where the system can go. Pull nearby records from the Alberta Water Wells database.
- Lakeshore is different. The 90 m shoreline distance, plus local lake bylaws, make lakefront lots the hardest to permit.
- Ask for the paperwork. On an existing system, ask the seller for the permit, the design, and any pump-out records before you remove conditions.