A dye test is a simple way to trace where water is going. It can help identify improper connections and other sources of unwanted water entering the sanitary sewer.
What a dye test can help identify
Dye testing can be useful when there is a question about where a downspout, sump pump, floor drain, foundation drain, yard drain, or other source is connected. If dyed water shows up in the sanitary sewer, that can indicate a connection that is allowing stormwater or groundwater into a system intended for wastewater.
Why that matters
The sanitary sewer is designed to carry wastewater from homes and businesses. Rainwater and groundwater add unnecessary volume. During wet weather, that extra water can increase flow dramatically and contribute to higher treatment and operating demands.
Dye testing is only one diagnostic method
A dye test does not replace every other type of inspection. Depending on the problem, crews may also use sewer cameras, manhole inspections, smoke testing, flow monitoring, or physical inspection of plumbing and drainage connections.
What the test looks like
The exact procedure depends on what is being investigated. Dye may be introduced into a suspected drain or water source, followed by enough clean water to move it through the connection. The downstream sewer or drainage system is then observed for the colored water. The test is controlled so the result can be tied back to the location being checked.
Homeowners should not use household chemicals as a substitute
Professional tracing dyes are selected for visibility and controlled use. Do not pour paint, strong chemicals, or other substances into drains in an attempt to trace a connection. If testing is needed, ask the District or a qualified plumbing professional about the proper method.
A simple test can answer an important question
Underground piping is often difficult to understand from the surface, especially on older properties where records may be limited. Dye testing can provide a straightforward answer to a basic question: Where does this water actually go?
If you have questions about drainage connections or unwanted water entering the sanitary sewer, contact the Ben Davis Conservancy District for guidance.
