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Smoke Testing
smoke testing drain.JPG
The 2013 smoke testing project has been completed.

The purpose of smoke testing is to find defects and faulty connections where excess rain water (Inflow) and ground water (Infiltration) can enter the sanitary sewer system, negatively effecting its economical and safe functioning.  Illegal Inflow sources/connections include: sump pumps, roof and foundation drains, and storm drain cross connections.  The information gained from smoke testing will help the City find and eliminate unknown sources of (I/I) entering the sanitary sewer system.  Reducing I/I is an on-going City effort to help:

• Comply with the Met Council Rules. The Metropolitan Council of Environmental Services  (MCES) may add a demand charge to Saint Paul’s wastewater treatment bills if the excessive I/I is not removed from the system.
• Maintain Health & Safety (Reduce the Risk of Sewer Back-ups and Sinkholes).
• Extend the Service Life of Public Infrastructure (Lift stations, sewer pipe, etc.)
• Reduce Wastewater Treatment Costs by reducing the amount of clear water that is treated.

For further information on the LiquSmoke product used in testing our sewers, as well as testing results regarding exposure and health please visit:

For more information about smoke testing, contact:

Girma Daka, C.E.
25 W 4th St
700 City Hall Annex
Saint Paul, MN  55102
Tel: (651) 266-6189
Fax: (651) 298-5621

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