1. What is the Septic Tank Size Calculation?

The septic tank size calculation determines the appropriate tank capacity based on daily wastewater flow. In Ontario, the minimum required tank size is 3600 liters, calculated as twice the daily flow (C = 2 × Q).

2. How Does the Calculator Work?

The calculator uses the septic tank size formula:

Where:

• \( C \) — Septic tank capacity (liters)
• \( Q \) — Daily wastewater flow (liters/day)

Note: Ontario regulations require a minimum septic tank size of 3600 liters regardless of the calculated value.

3. Importance of Proper Septic Tank Sizing

Details: Proper septic tank sizing is crucial for efficient wastewater treatment, preventing system overload, and complying with Ontario building codes and environmental regulations.

4. Using the Calculator

Tips: Enter the estimated daily wastewater flow in liters/day. The calculator will determine the required tank size while ensuring compliance with Ontario's minimum 3600-liter requirement.

5. Frequently Asked Questions (FAQ)

Q1: Why is there a minimum 3600-liter requirement in Ontario?
A: The minimum size ensures adequate retention time for proper solids separation and treatment, even for smaller households.

Q2: How do I estimate daily wastewater flow?
A: Daily flow is typically estimated based on number of bedrooms, fixtures, and occupants. Consult Ontario Building Code for detailed calculation methods.

Q3: Are there different requirements for different soil types?
A: While tank size requirements are consistent, soil absorption system design may vary based on soil percolation rates and other factors.

Q4: What if my calculated size exceeds 3600 liters?
A: You must use the larger calculated size. The 3600-liter requirement is a minimum, not a standard size for all applications.

Q5: Do I need professional approval for septic system design?
A: Yes, all septic system designs in Ontario require approval from the local health unit or conservation authority.