Manage Stormwater Inflow and Groundwater Infiltration this Spring

Spring conditions often increase stormwater inflow and groundwater infiltration (I&I) into municipal sanitary systems from private properties. High levels of I&I can result in increased operational costs, higher utility rates and greater risks of sewage backups and basement flooding.

Inflow occurs when water directly enters the sanitary sewer system through improper connections such as eavestrough downspouts, weeping tiles and sump pumps. Infiltration happens when groundwater seeps into the sewer system through cracks in pipes, maintenance and lateral connections.

Residents can help reduce these risks by:

• Eliminating direct connections between private storm drains and sanitary systems to reduce the risk of sewage backups in homes.
• Ensuring stormwater is directed safely away from building foundations to prevent flooding and water damage.

The Residential Inflow and Infiltration Subsidy Program (RIISP) offers financial assistance to homeowners who have experienced or could potentially experience flooding due to heavy rainfall, spring thaw or system blockages. The RIISP provides partial reimbursements for:

• Backwater valves (up to $1,500, including labour, materials and taxes).
• Sump pumps and pits (up to $1,875, including labour, materials and taxes).
• Lateral lining (up to $1,100, including labour, materials and taxes).
• Rain barrels (up to $60 per barrel, maximum of two barrels).
• Eavestrough extenders (up to $10 per extender, maximum of four extenders).

Reducing I&I is crucial for protecting the environment and supporting the City’s goal of achieving net-zero greenhouse gas emissions by 2050 through the Community Energy and Emissions Plan (CEEP). Proper stormwater management helps lower emissions and safeguards our environment.

For subsidy eligibility details and application instructions, visit www.greatersudbury.ca/riisp or contact 311.