Dye Testing

Dye testing is a method used to locate points where rain or ground water improperly enters the sanitary sewer system. During periods of high rainfall, such inflows can push the upper limits of pipe capacity and, in extreme cases, stress pumping capacity at the treatment plants themselves.

Captured rain or ground water should flow into storm water drains instead of sewer system lines. During tests, water colored with nontoxic dye is introduced into downspouts, driveways, or area drains. The downstream sanitary sewer manhole is then monitored for the presence of dyed water, which, if found, indicates a cross-connection between storm water drains and sewer pipes.

Additional Information
To learn more about dye testing, please contact the Sewer Division at (440) 248-5834.