Ontario Sanitary Sewer

Project Summary

The Ontario sanitary sewer project included installation of cured-in-place pipe and rehabilitation of sanitary sewer lines and water main repairs in a residential neighborhood in Ontario, Oregon. The project addressed Idahos Department of Environmental Quality (IDEQ) concerns over arsenic concentrations in the City’s wastewater discharge. The project team replaced the pipes where shallow groundwater with elevated levels of arsenic were infiltrating into the sewer lines.

During pipe bursting, IMCO had to provide  temporary water to residences. The team ran pipe down three blocks at a time and connected it to each home’s meter so that residents had water during pipe bursting operations. This work was performed in the winter, so the team prevented the temporary water from freezing by utilizing ground heaters and concrete blankets. 

Prior to bursting the pipe, IMCO crews dug pits and used machinery to pull the pipe through, removing valves and installing temporary water to the affected residences. Once the sewer and water lines were burst, the team hooked-up the new services and cut in new valves and fittings.



Ontario, Oregon


City of Ontario

Contract Amount



October 2021 – March 2022

Project Highlights

During excavation the team uncovered old abandoned wood pipe used in the early 1900’s in historic alleyways.