Lohrville Water Resource Restoration

Lohrville, IA | Water


ISG designed wastewater treatment infrastructure that the City could afford to implement through the strategic acquisition of funding resources.


The City of Lohrville’s wastewater treatment facilities were unable to meet updated regulatory requirements for more stringent water quality standards. In addition to the new regulations, the wastewater collection system showed evidence of severe deterioration and overwhelming storm water infiltration during and after rainfall events. The cost of rehabilitating the sanitary sewer exceeded the benefits, even with funding assistance.


The City hired ISG to assist with finding a solution to the problem. ISG recommended constructing a new, 3-cell controlled discharge lagoon to aid in meeting water quality regulations. The new lagoon system needed to be much larger since the existing gravity collection system was in such disrepair with prevalent infiltration and numerous cross connections with storm drains, roof drains, and foundation drains. ISG proposed utilizing a low pressure Septic Tank Effluent Pump (STEP) system that included installing septic tanks and effluent pumps at each building and a small diameter force main to convey wastewater to the lagoon treatment system.

Since Lohrville had no storm sewer infrastructure, one of the biggest advantages to installing the new STEP system is that the existing gravity sewer could be re-utilized and converted into a storm sewer. This resulted in significant cost savings since the City was able to construct a much smaller lagoon system.

The City was awarded Community Development Block Grant (CDBG) funding for the project, and was also awarded a 30% forgivable loan from the State Revolving Fund (SRF) Clean Water program. In addition, Lohrville also qualified for funding under the inaugural SRF Water Resource Restoration program, which allowed for the design and construction of low impact development stormwater infrastructure to help preserve water quality while addressing flooding issues.

Market News

ISG Adds Minneapolis Architecture Expertise

March 20, 2020 (Minneapolis, Minnesota) – In an effort to strengthen services for a wide range of partners in the Twin Cities and across the Midwest, ISG is joining forces with Architects Rego + Youngquist, LLC. (ARY) of St. Louis Park, Minnesota. As a premier provider of design services in the education, civic and cultural, and healthcare markets, ARY’s talented professionals will add a wider breadth of expertise as they are integrated into ISG’s multi-disciplinary team.
Read More

ISG Water Solutions Team Amplifies Resources, Adds Strategic Talent

January 28, 2020 (Storm Lake, Iowa) – ISG, a professional design and engineering firm that is 100% owned by employees, recently expanded its Water Solutions Group by welcoming long-time Iowa Department of Natural Resources (IDNR) leader Julie Sievers. Ready to embark on this new endeavor with ISG as Senior Water Specialist, Julie will complement a seasoned group of professionals, including internationally recognized Water Solutions Group Leader and Associate Principal, Uma Vempati, PE, PMP, ENV SP, Iowa project leader and Associate Principal, Tom Grafft, and many others within the firm of 315+ professionals.
Read More