Smoke testing to flush out illegal sewerage connections

SA Water will carry out smoke testing in Port Lincoln’s sewerage network in late April to help identify any incorrect or illegal stormwater connections, as well as cracked or damaged pipes that may be allowing stormwater into the system.

The testing involves releasing small amounts of artificially generated smoke into sewer pipes to trace where it escapes. The safe and widely used technique helps crews pinpoint areas where stormwater may be entering the sewer network.

Stormwater entering sewer pipes can significantly increase flows during heavy rains, placing pressure on pump stations and raising the risk of overflows into the environment.

During the testing, crews will monitor smoke emerging from locations such as stormwater downpipes connected to roof guttering, or from damaged inspection point lids along roads or footpaths.

SA Water’s General Manager of Sustainable Infrastructure Peter Seltsikas said Port Lincoln had been selected for testing after heavy rains in previous years put increased pressure on the local sewer network.

“Our observations indicate there may be points in the network where stormwater is entering the system during some rain events, and this testing will help us identify those locations,” Peter said.

“While some level of stormwater infiltration in the system is normal, heavy rain events can drive higher flows and place greater strain on pump stations and the sewer network.

“By identifying where stormwater is entering the system, we can target improvements that help reduce the risk of overflows and ensure our sewer network continues protecting public health and the environment.

“The information gathered will help inform a range of solutions, such as repairing or replacing sections of sewer main, or working with property owners if remediation is required.

“We understand some property owners may not realise they have an illegal stormwater connection, but identifying and fixing these helps keep the sewer network operating as it should.”

The odourless grey smoke, similar to that used for special effects at concerts or events, is harmless to people, plants, animals and the environment, does not stain and dissipates within a few minutes.

Inspections will take place between 7am and 5pm Monday to Saturday during the designated 4-week testing period from Monday 27 April. Testing will begin in Milton Avenue and move progressively south.

“The local community has been given advance notice of the work, and we have also notified the Country Fire Service in case smoke is observed,” Peter said.

“During the work, crews may need access to easements along roadsides as well as some driveways and front yards.

“There will be no disruption to our customers’ wastewater services as a result of this work, and people can continue using taps and plumbing fixtures as normal, as smoke will not enter areas where there is a water seal, such as a toilet.”

SA Water will update Port Lincoln residents via social media and letterbox notifications on progress of the testing program.