RJN Group, Inc. is conducting field investigations through the City of Southlake service area. This study will involve the opening and entering of manholes and cleanouts in the streets and easements.

An important task of the study will be the SMOKE TESTING of the sewer lines to locate obstructions and defects in the sewer system. The smoke that you see coming from the vent stacks on houses or holes in the ground is NON-TOXIC, LEAVES NO RESIDUE and CREATES NO FIRE HAZARD.

The smoke should not enter your home unless you have defective plumbing or dried up drain traps. Please pour a small amount of water in seldom used drains to fill the trap.

If smoke enters your home please contact the RJN staff working in your area or call our office at 972-437-4300.

All work is performed by uniformed RJN personnel who display photo ID badges. The updated work area location map will be kept on this page. Please check often for new map updates, as our work is dependant on weather conditions.

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During smoke testing, defects located along the main sewer or near manholes may be identified. These defects will be further tested using a procedure called DYED WATER FLOODING. The area where the defect was observed is "flooded" with green dye. If the dye water appears in the sewer system, then the sewer line is flagged for internal television to determine the exact location and source of the defect. Residents may notice the "green" colored dye on the ground or in the storm ditch during the testing. Please note that this is a harmless substance.