Money Saved! How to Effectively Inspect Sewer Laterals

Throughout the United States, authorities estimate that up to 50% of a sanitary sewer collection system's footage is comprised of public-private laterals. Inflow and infiltration (I/I) originates from a variety of sources within a collection system, many located on private property and/or not maintained by the local sewer authority. Based on surveys from many communities across the country, I/I derived from private sources ranges between 20% – 80% of total I/I (Private Property Virtual Library database). Throughout the industry, the common conclusion is that private property I/I sources are significant. Many utilities are finding it cost-effective to address these problems and consequently reduce capital expenditures and operating costs.Private source I/I reduction activities start with lateral inspections, which have proven to be a very cost-effective tool. This paper will discuss lateral inspection techniques, present data output, and demonstrate how data is used to support rehabilitation recommendations that provide the client with a cost-desirable solution.