Stormwater Management

The City Engineer manages the City’s program to develop, implement and enforce a stormwater management program designed to reduce the discharge of pollutants to the maximum extent practicable to protect water quality. Stormwater runoff is generated when precipitation or snow melt flows over land or impervious surfaces and does not infiltrate into the ground. As the runoff flows over the land or impervious surfaces (paved streets, parking lots, sidewalks and building rooftops), it accumulates debris, chemicals, sediment, or other pollutants that could adversely affect water quality if the runoff is discharged untreated. The primary method to control stormwater discharges is the use of best management practices (BMPs). In addition, most stormwater discharges are considered point sources and require coverage under an NPDES/MS4 permit. 

Water pollution degrades surface waters making them unsafe for drinking, fishing, swimming, and other activities. Authorized by the Clean Water Act, the National Pollutant Discharge Elimination System (NPDES) permit program for MS4 controls water pollution by regulating point sources that discharge pollutants into waters of the United States. Point sources are discrete conveyances such as pipes or man-made ditches. Individual homes that are connected to a municipal system, use a septic system, or do not have a surface discharge do not need an NPDES/MS4 permit; however, industrial, municipal, and other facilities must obtain permits if their discharges go directly to surface waters. Since its introduction in 1972, the NPDES permit program is responsible for significant improvements to our Nation’s water quality. Communities with 1000 people or more per square mile must follow the NPDES General Permit for Small Municipal Separate Storm Sewer Systems (MS4). The City of Ontario became a small MS4 in 2009 and is required to maintain a small MS4 permit through the Ohio Environmental Protection Agency. These regulations require designated communities to develop and implement a storm water management plan (SWMP).

This is accomplished by implementing six minimum control measures (click on each of the 6). 

  1. Public Education and Outreach —
    BMPs for MS4s to inform individuals and households about ways to reduce stormwater pollution.
  2. Public Involvement and Participation —
    BMPs for MS4s to involve the public in the development, implementation, and review of an MS4’s stormwater management program.
  3. Illicit Discharge Detection & Elimination —
    BMPs for identifying and eliminating illicit discharges and spills to storm drain systems.
  4. Construction Runoff Control —
    BMPs for MS4s and construction site operators to address stormwater runoff from active construction sites.
  5. Post-construction Runoff Control —
    BMPs for MS4s, developers, and property owners to address stormwater runoff after construction activities have completed. 
  6. Pollution Prevention/Good Housekeeping —
    BMPs for MS4s to address stormwater runoff from their own facilities and activities.

Public Education and Outreach

Theme Q3 2022______________________________
“Trees – Reduce & Clean Stormwater”

Trees are valued for the beauty and many other benefits they bring to our landscapes and neighborhoods. Trees are increasingly recognized for their importance in managing
runoff. Their leaf canopies help reduce erosion caused by falling rain. They also provide surface area where rainwater lands and evaporates. Roots take up water and help
create conditions in the soil that promote infiltration ultimately reducing and cleaning stormwater runoff (EPA).

Soak Up The Rain by EPA
Trees Reducing Stormwater Runoff by The Center for Watershed Protection
Stormwater Trees Technical Memo by EPA

Public Involvement and Participation

Events page:

Illicit Discharge Detection and Elimination

Illicit Discharge Detection Flyer by Respect Our Waters
Chapter 938 Illicit Discharge and Connection Stormwater Regulation

Contact the City of Ontario to report
suspected illegal dumping or illicit discharge

Michael Morton, Zoning Inspector
3375 Milligan Road, Ontario, Ohio 44906
Office: 419-529-2530
Cell: 419-961-7222

Construction and Post Construction Runoff

Chapter 937 Stormwater Management
Chapter 1353 Erosion and Sediment Control
Chapter 1354 Riparian and Wetland Setbacks
Ontario Codes and Ordinances

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