Underground Services LTD

Dye Testing

Mar-Tech Sewer Dye Testing

Although video inspection and other techniques certainly are important components of an I&I survey, research has shown that approximately 65% of all extraneous stormwater inflow enters the system from somewhere other than the main line.

Dye testing sewers is a method used to determine if storm water is getting into the sanitary sewer through cross connections.

To do this, an environmentally friendly 100% biodegradable fluorescent dye and water is poured down the storm drain pipe. Then the adjacent sanitary sewer is checked to see if the dye is getting into the system. (Typical places the dye can be added to the storm system are at manhole, catch basin leads, down roof vents, driveway drains, lawn basin leads etc).

Dye testing can also be used when relining sewer lines and trying to determine if a lateral is active or not. To do this you would set a video truck up in the line you want to reline and then flush dye down toilets in each house that ties into that line. After confirmation that the service is active the CCTV operator would go to the next service and do another dye test and so on down the line until all laterals are accounted for. This way only the active laterals are opened up and laterals that are not tied in are not reinstated. This will help keep unwanted I&I from getting into the sanitary sewer lines.

Dye testing determines whether or not your home's yard drain is connected to a sanitary only sewer. To make this determination, a dye tablet is placed inside outdoor drains, then the drain is flushed with water. If the dye is found in the sanitary drain, then the property will fail the test.

A dye test is used to verify if the gutters, driveway drains, yard drains, or other stormwater collection devices are connected to a sanitary sewer that is intended to carry raw sewage only. This type of connection is not allowed and must be fixed before the sale of a property.