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Storm water management

Rain and snowmelt tend to erode exposed soils and consequently runoff from construction sites may carry increased sediments to state surface waters. For projects that disturb more than one acre, NorthWestern acquires discharge permits from the state or local agencies in Montana, South Dakota or Nebraska which regulate the storm water under the Clean Water Act. Storm water permits require Storm Water Pollution Prevention Plans (SWPPPs) which are site-specific documents that describe the storm water control measures known as Best Management Practices (BMPs) that will be used to reduce or eliminate storm water discharges at construction projects. Routine inspections of the BMPs are conducted and documented and as the project progresses and goes through changes, NorthWestern updates the plan.
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