SA036 Infiltration & Inflow Removal Program

Project Details:

Project Start Date: 1/1/2022

Ongoing Program: Y

Submitting Department: Public Works

Contact Person: Kelly Moriarity

Level of Need: Significant

Estimated Project Completion Date: 12/31/2027

Department Priority: 2 of 3

Contact Phone Number: 612-673-3617

Website: TBD

Project Location:

Address: City Wide

City Sector: CityWide

Affected Neighborhoods: City Wide

Affected Wards: All

Project Description:

This program focuses on implementing an inflow and infiltration (I&I) reduction program based on Metropolitan Council Environmental Service’s (MCES) Ongoing I&I Surcharge Program and the City’s Combined Sewer Overflow (CSO) elimination efforts. Inflow is typically flow from a single point where stormwater is entering the sewer system directly through stormwater inlets or discharge from sump pumps, downspouts, and foundation drains. Infiltration usually means the seepage of groundwater into sanitary sewer pipes through cracks and joints. Specific activities include but are not limited to rehabilitation projects, lining of sewer pipes, and manhole lining/repairs.

Purpose and Justification:

The purpose of the program is to implement projects that will reduce the amount of clear water in the sanitary system and reduce the risks for overflows of untreated sewage mixed with stormwater to the Mississippi River during severe rainstorms. The reduction of clear water in the sanitary sewer system is also required by MCES, which provides regional wastewater collection and treatment. The MCES Ongoing I&I surcharge program is based on reducing peak flow from the city sanitary system that occurs during large rain events. The program requires communities to continually invest in the system and make progress in removing I&I. Reduction of I&I also reduces the total volume of wastewater sent to the treatment plant and therefore reduces the amount of money the City has to pay MCES to treat wastewater.

Project Visuals and Map:


Have Grants for this Project been secured?

Not for current year, but will seek out new grants as they become available.

Describe status and timing details of secured or applied for grants or other non-City funding sources:

The City has applied for and received grant funding from the State through the Met Council for I&I mitigation projects whenever these grants become available. The City has received $3,485,818 in grant funding from 2011-2019 to supplement the City’s I&I program. These grants typically pay for 25% of the cost and require a local share of 75%.

Describe any collaborative arrangements with outside project partners, including who they are and what their role is with the project:

MCES provided funding thru their grant programs for portions of multiple projects


State Law Chapter 462.356 (Subd. 2) requires review of all capital improvements for compliance with the comprehensive municipal plan. Chapter 13, Section 4 of the City Charter requires Location and Design Review for the purpose of approving the sale of bonds for these projects. Describe how the project is consistent with the adopted City/Park Board comprehensive plans and how the project implements goals and policies as stated in the adopted plans, including specific policy references:

Goal 11 - Clean environment: In 2040, Minneapolis will have healthy air, clean water, and a vibrant ecosystem. (Policy 72:Sustainable Water System Management, Policy 73:Stormwater Management, Policy 74:Integration of Water Management into Development)

Goal 10 - Climate change resilience: In 2040, Minneapolis will be resilient to the effects of climate change and diminishing natural resources, and will be on track to achieve an 80% reduction in greenhouse gas emissions by 2050. (Policy 72:Sustainable Water System Management, Policy 73:Stormwater Management, Policy 74:Integration of Water Management into Development)

This project is consistent with planning and policy guidelines set forth in the City’s comprehensive plan Minneapolis 2040

Provide the date that Location and Design Review was conducted for the project, the outcome of that analysis and the date formal action was taken by the Planning Commission:

Location and Design Review for this project took place on May 4, 2009. The project was found consistent with the City’s comprehensive plan. No additional review is required.

Project Cost Breakdown

Department Funding Request

Economic Development

Will the project contribute to growth in the city’s tax base?

Indirectly supports

Describe the economic development impact of the project:

Removal of Inflow and Infiltration from Sanitary Sewers can provide additional capacity for future development more cost effectively than expanding system

Does the project support redevelopment opportunity that without the project would be infeasible?



Is the proposed project on an existing or planned transitway, transit route, or high-volume pedestrian corridor? If yes, provide details on how the project will improve the transit and/or pedestrian experience.


Does the proposed project anticipate multi-modal enhancements (sidewalks, bicycle or transit facilities)? Provide details.


Is the right-of-way constrained and do you anticipate that modes of travel will be competing for space? Provide details, is there potential for innovative design options? Provide details


Operating Impacts

Operations & Capital Asset Maintenance:

Is this request for new or existing infrastructure? Both, but primarily consists of rehab/repair of existing.

What is the expected useful life of the project/Improvement? 50 years

Year that Operating Incr/(Decr) will take effect? Ongoing

What is the estimated annual operating cost increase or (decrease) for this project? N/A

Any Prior Year Remaining Bond Authorizations? Yes

Prior Year Remaining Bond Authorizations: $244,447

Describe how operating cost increases or decreases were determined and include details such as personnel costs, materials, contracts, energy savings, etc:

Investing in sanitary sewer rehabilitation will ultimately decrease operating costs as savings are realized in labor, equipment and material expenses associated with the ongoing maintenance and small repairs of the areas in most need. Clear water can also be removed with these projects, potentially reducing the MCES treatment costs.

If new infrastructure, discuss how the department/agency will pay for the increased annual operating costs:

Primarily consists of rehab/repair of existing, results in longer useful life of existing assets.

For new infrastructure, describe the estimated timing and dollar amount of future capital investment required to realize the full expected useful life of the project:

No future capital investment is required to realize the expected useful life of these improvements.

Project Coordination

Describe completion status for ongoing projects and how and when the department/agency plans to use the prior year remaining bond authorizations:

SW036 is set up as a long term asset management program with an ongoing rehabilitation plan. Projects are generally completed within the year programmed. Some contracts may span more than one budget year. Prior year bond authorizations will be used for projects in the current year.

If this is a new project, describe the major project phases and timing anticipated for completing the project:


Scalability/Funding Allocation Flexibility – discuss any flexibility to increase or decrease funding among the years in the five-year plan and the most that could be spent in a given year:

This program has some flexibility between years in the five-year plan, but MCES requires steady investment in I&I reduction.

Minneapolis Goals and Strategic Direction

Minneapolis is a growing and vibrant world-class city with a flourishing economy and a pristine environment, where all people are safe, healthy and have equitable opportunities for success and happiness.

This project improves the efficiency of existing sewer infrastructure and services, and reduces the chances for adverse health or ecological impacts—in furtherance of the following City Goals. Sewer system analysis and identification of needs is driven by data and national rating systems, reducing the potential for bias and supporting an equitable service level across the city.

Public Services

The City prioritizes reliable and equitable access to high-quality public services.

Work collaboratively between City departments to ensure utility budgets are adequately funded to maintain aging infrastructure systems

Prioritize and reserve the City’s sanitary and storm sewer capacity for its intended purpose and prohibit groundwater or other waste streams from entering the storm or sanitary sewer infrastructure unless the City gives approval.

Environmental Justice:

The City prioritizes sustainable practices and renewable resources to equitably address climate change while restoring and protecting our soil, water and air.

Manage the city’s surface waters, groundwater, stormwater, wastewater and drinking water equitably and sustainably, while minimizing the adverse impacts of climate change.

Use hydraulic and water quality models and data about infrastructure condition and risks to prioritize and inform investments in sanitary and storm infrastructure.

Continue work to reduce risk of overflows from the historically connected sewers and work to reduce infiltration and inflow into the city’s sanitary sewer system through infrastructure improvements.

Consider climate forecasts in stormwater feasibility and modeling work to inform infrastructure investments.

Explore the impacts of flooding on public safety, the protection of property, public infrastructure and the environment.

Improve the tree canopy and urban forest.

Built Environment & Transportation:

The City prioritizes high quality neighborhoods, streets, infrastructure and equitable access to multimodal transportation in all parts of the City through thoughtful planning and design.

Manage and design transportation infrastructure with a priority on water quality through the reduction of stormwater runoff and pollutants including road salt.

Maximize the use of public property to meet flood mitigation and water quality goals via green infrastructure and other stormwater best management practices

Use infiltration best practices and bio-infiltration to reduce stormwater impacts on surface waters.

Encourage and require reductions in amounts of impervious surfaces. Pilot and promote permeable surface solutions as alternatives to impervious surfaces.

Additional Information

Add any additional information you feel is important for the CLIC committee, Mayor, City Council members or the general public to know about this potential project and why it should be approved: