sewage system
sewer system
sewage works

Do this only if you are on a sewer system.

This was how he'd developed his interest in a public sewer system.

By the year 2000, 60% of the population was connected to a sewer system.

Access to drinking water is available to 90% of the population, and 85% can use the sewer system.

The first sewer system, if all goes according to plan, should be installed and working by about 2007.

What I wanted, real bad, was to have my maps of the sewer system.

The others take water that has not been used back into the underground sewer system.

You need a functioning sewer system to support business development.

Over the years, the town's sewer system reached the point of near collapse.

With the help of the younger boy, the two escape through the sewer system.