A Municipal Separate Storm Sewer System (MS4) consists of a city's stormwater conveyance system including underground pipes, roads with drainage systems, gutters, and ditches.
Infrastructure totals (including City, State, and private assets) in 2018 for the City of Kalispell:
1,406 manholes
3,998 inlets
79 stormwater basins
69 outfalls
158 miles of underground pipe (laterals and mains)
Small Municipal Separate Storm Sewer System (MS4) Permit
The Permit requires Kalispell to develop, document, and maintain a Stormwater Management Program (SWMP) (PDF) to reduce the discharge of pollutants from the Small MS4 to the maximum extent practicable.
The goal of the program is to protect and improve local water quality because most stormwater enters local rivers and streams without any treatment.
Annual Report
View the annual reports for Montana DEQ's stormwater permit for Kalispell.
The City samples stormwater to better understand what is in our stormwater and the effectiveness of best management practices. View our 2018 Stormwater Sample Evaluation.
