Iowa City, IA – June 2025 – The City of Iowa City has officially issued bidding documents for a major infrastructure improvement project: the Iowa City Wastewater Treatment Facility Digester Complex Rehabilitation – Phase 1 (Contract V3151). This project represents a significant investment in the city’s wastewater treatment system, supporting reliable service, environmental stewardship, and long-term growth.
The scope includes a new sludge conditioning building equipped with pumps, a sludge screen, a fats, oils, and grease (FOG) receiving system, and a high-strength waste (HSW) receiving station. Additional components include a stainless-steel silo, fiberglass chemical storage tank, duplex chemical pumping system, compressed gas mixing system, and new digester mixers. The project will also deliver a digester gas flare and a renewable natural gas (RNG) conditioning facility. Supporting improvements include demolition, site work, piping, and upgrades to electrical, HVAC, and plumbing systems.
The project is being designed by Strand Associates, Inc.®, of Madison, Wisconsin, with specialized contributions from Brown and Caldwell. Funding is anticipated from the Iowa Department of Natural Resources’ Clean Water State Revolving Fund, ensuring compliance with American Iron and Steel requirements, Davis-Bacon wage rates, and Disadvantaged Business Enterprise (DBE) participation goals.
“This project represents a long-term commitment to sustainability,” said city officials. “By upgrading the digester complex and adding renewable natural gas facilities, Iowa City continues its leadership in clean water management and energy recovery.”
Written by:
Angie Lippe Project Manager, ESCO Automation