What the village requires
Maryville publishes its sewer lateral requirements, and the 2026 edition is specific. The pipe is SDR 35. The bedding is CA-7 crushed stone. The Illinois Department of Public Health inspects the first five feet out from the foundation, the part state law treats as building drain, and the village inspects the rest of the lateral to the main. Inspections are booked through the Water Clerk.
The requirements also point to the newest state rule: since January 1, 2026, a new plastic lateral has to be locatable from the surface by electromagnetic or equally effective means, so a tracer goes in the trench with the pipe.
A young town with new construction
Maryville’s median house dates from 1997, younger than O’Fallon’s (1995) or Troy’s (1992). New laterals for new houses and additions get built to those rules, and the camera goes through every new line before the trench is backfilled.