On November 15, the City of Redwood Falls passed an ordinance to start an Inflow & Infiltration (I/I) Reduction Program to reduce sanitary sewer overflows and sewer back-ups throughout the City.

What is Inflow & Infiltration?

Inflow is when clear water (ground, rain, or storm water) from illegal connections of sumps pumps, downspouts, and foundation drains is channeled directly into the sanitary sewer.

Infiltration is when groundwater seeps into sewer pipes via cracks or leaky joints.

What’s the problem?

Because the sanitary sewer system was not designed to handle this excess clear water, it becomes overloaded during times of high groundwater or heavy rainfall. This can cause basement flooding or bypassing of raw wastewater to local streams and lakes. The excess clear water from I/I problems uses sanitary sewer capacity needed for wastewater. The result is sewer backups and increased costs for needlessly putting clear water through the wastewater treatment.

View Image of Sources

What to Expect

Throughout the next few years, I/I sources will be identified by one or more of the following methods in order to reduce city-wide basement backups that affects property owners and the City's sanitary sewer system:

- Sump Pump Inspections: verify sump pump discharges are not connected to the sanitary sewer system (see below for more information on the inspection process).

- Televising: video recording of the inside of public mains and private services to identify cracks, collapses, root intrusions, failed joints, and other potential sources of I/I. All public and private sanitary sewer service lines will eventually be televised.

- Dye Testing: non-toxic dye is injected into groundwater or surface water sources to monitor the sanitary sewer system.


More Info About The Inspection Process

To comply with the Inflow and Infiltration Reduction Program Ordinance, the City has hired ISG to inspect homes and businesses in Redwood Falls to determine if roof drains, foundation drains, sump pumps, and other clear water sources are connected to the sanitary sewer system. The goal of this program is to reduce excessive flows that enter the sanitary sewer system causing issue and increasing costs to the City and property owners.

View Inspection Process

Meet the ISG Inspection Team

Justin Rodgers, Construction Administrator

  • Education: South Central College
  • Years with ISG: 2
  • Hometown: Spicer, MN
  • Fun Fact: I enjoy custom woodworking in my free time.

Darin Howell, Construction Administrator

  • Education: Minnesota State University, Mankato
  • Years with ISG: 1.5 years
  • Hometown: Mukwonago, WI
  • Fun Fact: I just got married in October, 2019 and honeymooned in Scotland.

Alex Dryer, Construction Administrator

  • Education: Minnesota State University, Mankato
  • Years with ISG: 1 year
  • Hometown: Kiester, MN
  • Fun Fact: I was invited to an invite-only try out for the Minnesota Twins after high school.

John Meyer, Construction Administrator

  • Education: South Central College
  • Years with ISG: 1.5 years, but I have been in the drainage industry for a total of 10 years
  • Hometown: Kiester, MN
  • Fun Fact: In 2019, my family was finally able to purchase a hobby farm, which has been a dream of mine since I was a child. Literally, a dream come true!

Tyler Schager, Construction Administrator

  • Education: Wartburg College
  • Years with ISG: 4 Months
  • Hometown: Kasson, MN
  • Fun Fact: Huge Iowa Hawkeye Fan.