Storm Drains

Storm drains are largely the responsibility of two Genesee County Agencies. They are:

  • Genesee County Road Commission - Phone: 810-767-4920 - All drains adjacent to roadways are used to remove surface water from roads.
  • Genesee County Drain Commission - Surface Water Management - Phone: 810-732-1590 - All off-road drains and large open drains designed to remove water from property and land throughout the Township.

Report All Illicit Discharges Into Storm Drains

Please call 810-424-2640 if you see anyone dumping anything but water down storm drains.

National Pollution Discharge Elimination System

Grand Blanc Township is responsible for maintaining, mitigating, and preventing pollution from surface water drainage to enter water bodies near our Municipal campus located at 5371 S Saginaw Street. This program is called the National Pollutant Discharge Elimination System (NPDES). Although the Township Campus is just a small part of the Township, we take our responsibility of keeping our drainage to rivers and streams protected.

Our NPDES program is permitted through the State of Michigan Department of Environment, Great Lakes, and Energy (MI-EGLE). The permit requires the Township to perform the following requirements:

  • Regular township campus housekeeping
  • Public education
  • Construction inspection and observation
  • Ensuring compliance of the Township Storm Water Management Program (SWMP)

Violation Notice

Grand Blanc Township received a violation notice in early 2020 stating that we were out of compliance due to missing progress reports from 2014 to 2019. This violation has been rectified and the missing progress reports have been turned into MI-EGLE.

What is a Watershed Infographic (JPG) Opens in new window


A watershed is a specific area of land that surface water drains to a larger river, stream, or Lake. In a large storm event, water from our Township campus parking lots and DPW work areas will wash into the drains traveling through the underground storm sewer network before entering the marsh north of our property. The marsh will hold water for some time but even a couple of inches of rain will fill the marsh and water will eventually flow to the Gibson drain and then to the thread creek. 

This is an example of a watershed where surface water travels from one body of water to another until reaching a Great Lake.