Inflow and Infiltration

Water Inflow Infiltration
The Township of Springwater is conducting Clear Water Infiltration Inspections in an ongoing effort to ensuring that the Townships sanitary sewer system is operating efficiently

What is inflow infiltration?    
Inflow infiltration occurs when clean water enters the sewage treatment facility unnecessarily. Clean water can be either rainwater or ground water, and it can enter the sewer system through downspouts, sump pump connections or foundation drain connections that are joined to the system illegally.

Why is inflow and infiltration an issue?
When clean water enters the sanitary sewer system the treatment facility can become overloaded and discharge untreated sanitary sewage into the natural environment. In addition to these serious environmental concerns, the Township and taxpayers spend additional tax dollars to treat water that could best be absorbed by gardens and lawns. If the volume of clean water entering the system is not reduced, it could lead to a costly expansion of the sewage treatment plant.

How is an inspection performed?
Inspections examine clear water connections to the sewer system which include:

  • sump pump connections

  • roof downspout connections

  • foundation drain connections

There are a number of ways a connection can be inspected.

Visual Inspection
A visual inspection is the most common type of inspection. A trained staff member will visually inspect the sewage system for possible sources of inflow and infiltration.

Smoke Testing
A process of blowing non-toxic, non-staining vapour or “smoke” into the sewer system. The purpose is to determine direct connections from downspouts, storm sewers or other potential sources of inflow and infiltration.

Dye Testing
Similar to smoke testing, dye testing involves introducing a non-toxic dye to potential sources, such as ditches, storm mains, sump pits etc. to determine potential sources of inflow and infiltration.