COUNCIL BLUFFS, Iowa (AP) — Residents of a Council Bluffs apartment are moving because of concerns about a sewer line.

City leaders have told residents of the Riverbend Apartments to leave because of a growing sand boil compromising the line.

A malfunctioning private pumping station and sewage line due groundwater bubbling is causing the concern. Fixing the problem isn’t an option, because the work could threaten a nearby levee along the flooding Missouri River.

About 70 families are affected. Some are moving to a nearby apartment complex or