Stormwater discharges are generated by runoff from land and impervious areas such as paved streets, parking lots, and building rooftops during rainfall and snow events. Stormwater often contains pollutants in quantities that could adversely affect water quality. Most stormwater discharges are considered point sources and require coverage by a National Pollutant Discharge Elimination System (NPDES) permit. The primary method to control stormwater discharges is through the use of best management practices (BMPs).
Ohio NPDES Stormwater Program Fact Sheet
For information about stormwater management at home, visit the Make a Difference section of our website.
Forms & General Permits
Application forms are now only accessible electronically via the Ohio EPA eBusiness center: Step-by-step guidance is located here.
Consultants cannot PIN (i.e., electronically sign) applications on behalf of their clients. Consultants can complete and save an application then delegate it to their client to PIN and submit.
Access the General Permit NOI, NOT, NOE, Co-Permittee NOI/NOT, and Individual Lot NOI/NOT forms through your Ohio EPA eBusiness Center account and submit electronically. The NPDES Permit Transfer form is located below.
Stormwater General Permits
- Stormwater Discharges from Small and Large Construction Activities - General Permit, includes Big Darby Creek Watershed and Portions of Olentangy River Watershed
- Industrial Stormwater
- Small MS4 Stormwater
- Oil and Gas Linear Transmission Stormwater
Issued Permits/Permittee Lists
- Dischargers Covered Under Stormwater Discharge General Permits
- Interactive Map of Construction Stormwater Permits issued since January 2014
- Individual MS4 permits for discharge of stormwater
Construction Site Stormwater -General Permit (OHC000005)
Construction sites impact Ohio's waters by:
- adding pollutants, especially sediment, to rainwater running off of construction sites during construction; and
- making long-term land use changes that alter the hydrology and pollutant loading of local streams.
To limit the negative impacts of construction projects on Ohio's waters, Ohio EPA administers a permitting program designed to document construction activity in the state and require practices that keep pollutants out of the streams. The permitting program is mandated in the Clean Water Act and is part of the NPDES (National Pollutant Discharge Elimination System) program.
Who needs a permit?
As of March 10, 2003, if your project disturbs 1 or more acres of ground, you must get a permit to discharge stormwater from your site. If your project disturbs less than 1 acre but is part of a larger plan of development or sale, you also need a permit to discharge stormwater from the site.
How do I get a permit?
Most sites may get permit coverage under the general permit for discharge of stormwater associated with construction activity. To get permit coverage, follow these steps, in order:
- Develop a Stormwater Pollution Prevention Plan (SWP3) for the construction site;
- Submit a Notice of Intent (NOI) requesting coverage for your discharges under the general permit;
- Wait until you receive the Ohio EPA approval letter stating that you are covered under the general permit;
- Ensure that contractors, subcontractors and staff understand their roles in carrying out the SWP3;
- Implement the SWP3;
- Proceed with construction, including regular maintenance and inspection of sediment and erosion controls and stormwater management facilities.
Technical Assistance & Permit Compliance Materials
Stormwater Technical Assistance Program
The Stormwater Technical Assistance Program assists communities, developers, contractors, and consulting engineers with controlling the adverse impacts associated with new and existing development, including increased runoff, polluted stormwater, stream erosion and loss of floodplain services. This section provides guidance for cost-effective and preventive measures (best management practices) that can be applied to limit these impacts during construction and after development. These practices control erosion and trap sediments during construction, treat pollutants from developed areas and reduce stormwater runoff and protect downstream waters. Practice standards and specifications are available through the Rainwater and Land Development manual. Various tools are made available to facilitate compliance with Ohio's NPDES permit requirements and other regulations. Training is offered for stormwater practice design, stormwater management plan review and construction site inspection.
To receive notice regarding updates to or new stormwater technical assistance material, please subscribe to the Rainwater Updates by clicking here.
Stormwater Design Manuals
Erosion and Sediment Control Q&A Documents
Post-Construction Q&A Documents
- Post-Construction Q&A - Water Quality Volume
- Post-Construction Q&A - Water Quality Volume Drawdown
- Post-Construction Q&A - Previously Developed Areas
- Post-Construction Q&A - Small Construction Activities (< 2 acres)
Tools and Spreadsheets
- WQv Calculator
- BMP Compliance Worksheets
- Runoff Reduction Spreadsheet
- Sediment Basin Compliance Spreadsheet
Forms & Checklists
- Stormwater Pollution Prevention Plan (SWP3) Checklist
- Construction Site Inspection Checklist
- Ohio EPA Alternative Post-Construction BMP Submittal Form
Additional Compliance Material
- Routine Maintenance Exclusion from Small Construction Activity Permitting
- Guidance on Manufactured Treatment Devices as Pretreatment for Underground Stormwater Management Systems
- Guidance on Post-Construction Stormwater Controls for Solar Panel Arrays
- Guidance on Post-Construction Stormwater Controls for Wind Turbine Facilities
- U.S. EPA Guidance for Developing SWP3 for Construction Activities
- Construction Stormwater Permit Requirements for Agricultural Projects
- Chagrin River Watershed Partners, Inc. (CRWP) has developed a model agreement that a municipality may use to ensure the long-term operation and maintenance of post-construction best management practices (BMPs). This language may need to be modified to reflect local requirements and should be reviewed by the municipality's legal council. The link below will redirect you from Ohio EPA to CRWP's website.
- Northeast Ohio Stormwater Training Council's Maintaining Stormwater Control Measures, Guidance for Private Owners and Operators
Big Darby Creek Watershed Permit Compliance Materials
The Big Darby Creek watershed is among the most biologically diverse stream systems of its size in the Midwest. Befitting this distinction, Ohio water quality standards regulations assign the most stringent aquatic life use designations (exceptional warmwater habitat and coldwater habitat) and the outstanding state water antidegradation category to many of the larger streams in the watershed. The watershed is home to several endangered species and Big and Little Darby Creeks are designated state and national scenic rivers.
However, recent studies document declines in water quality and stream habitat, some of which have been found to be directly related to construction activity. Among the most visible and widely publicized future threats to the Big Darby Creek watershed is conversion of farm land to suburban and commercial land uses, especially in Franklin County.
As a result, Ohio EPA has developed specific watershed conditions, found in Appendix A of OHC000005, for stormwater associated with construction activity within the Big Darby Creek watershed. Appendix A implements many of the basic recommendations regarding the programs, activities and Best Management Practices developed through the Total Maximum Daily Load process and the State Water Quality Management Plan and 208 Plan. Ohio EPA believes implementation of these recommendations is necessary to protect the unique water quality and biological integrity of the Big Darby Creek system.
Permit Compliance Materials
- Big Darby Creek Watershed Map
- Ground Water Recharge Table-Applicability Map
- Land Use Map
- Hydrologic Soil Group Data
- Big Darby Watershed Groundwater Recharge Calculator
- Big Darby Creek Watershed TMDL Report
- State Water Quality Management Plan
GIS Data for Download
Save the following .zip files to your computer's hard drive and use a program such as PKZIP or WINZIP to extract the files.
- Land Use Data from TMDL (grid) [ZIP 390K]
- Watershed Boundaries (shapefile) [ZIP 402K]
- Ground Water Recharge Table-Applicability (shapefile) [ZIP 165K]
Olentangy River Watershed Permit Compliance Materials
Draining 543 miles of Central Ohio landscapes, the Olentangy River watershed provides drinking water, recreation, agricultural drainage and other public goods for over 250,000 watershed residents. Its waters and habitats are home to unique and diverse communities of fish, mussels and other aquatic life. Recent studies document declines in its water quality and stream habitat. Among the most visible and widely publicized threats to the Olentangy's water quality and habitats is the conversion of farm and forest acreage to residential and commercial land uses at an exceptionally rapid pace.
The river system drains Ohio's first and sixth most rapidly populating counties - Delaware and Morrow, respectively. Delaware County's most rapidly developing townships - Delaware, Liberty and Orange - overlap the river's State Scenic River section. Areas of the Whetstone Creek subwatershed, located within Morrow County, are designated as Exceptional Warmwater Habitat (EWH) with two tributaries being designated as Coldwater Habitat (CWH). Approximately two miles of the Olentangy River is designated as EWH within Franklin County. This area is currently receiving the greatest pressure for development within Franklin County's portion of the watershed.
As a result, Ohio EPA has developed an alternative general permit for stormwater associated with construction activity specific for portions of the Olentangy River watershed. This alternative permit implements many of the basic recommendations regarding the programs, activities and Best Management Practices developed through the Total Maximum Daily Load process. Ohio EPA believes implementation of these recommendations is necessary to protect the unique water quality and biological integrity of the Olentangy River watershed.
Ohio EPA's Statewide Construction stormwater General Permit (OHC000005) incorporates the Big Darby Creek watershed and portions of the Olentangy River watershed requirements as appendices. These two watersheds' previous specific alternative general permit conditions, that exceed the standard statewide conditions, have been included as appendices in OHC000005. This has combined all three general permits into one.
Permit Compliance Materials
- Olentangy River Watershed Map
- Figure 1: Olentangy River Mainstem Riparian Setback
- Figure 2: Perennial Streams Riparian Setback
- Figure 3: Intermittent Streams Riparian Setback
- Figure 4: Ephemeral Streams Riparian Setback
Industrial Stormwater - General Permit (OHR000007)
Activities that take place at industrial facilities, such as material handling and storage, are often exposed to stormwater. The runoff from these activities discharges industrial pollutants into nearby storm sewer systems and water bodies.This may adversely impact water quality.
Eleven Categories of Stormwater Discharges Associated With Industrial Activity (U.S. EPA website)
Potential Waiver for Facilities with "No Exposure"
If you qualify for no exposure certification, you are exempt from permit requirements until your facility no longer qualifies for no exposure certification. If your facility changes and can no longer claim no exposure to stormwater, you must submit the appropriate permit application for stormwater discharge. The No Exposure Certification form must be submitted to Ohio EPA on the eBusiness Center at least once every five years.
For additional background information, see the following U.S. EPA documents:
- Industrial No Exposure Certification Fact Sheet
- Industrial No Exposure Certification Guidance Document
Small Municipal Separate Storm Sewer Systems (MS4's)-General Permit (OHQ000004)
What is a Municipal Separate Storm Sewer System (MS4)?
A conveyance or system of conveyances (including roads, catch basins, curbs, gutters, ditches, man-made channels, or storm drains):
- Owned or operated by a public body
- Designed and used for collecting stormwater
- Is not a combined sewer
- Is not part of a Publicly Owned Treatment Works (POTW)
The U.S. EPA's stormwater program addressed stormwater runoff in two phases. Phase I addressed stormwater runoff from large and medium MS4s. Large municipalities with a separate storm sewer system serving a population greater than 250,000 and medium municipalities with a service population between 100,000 and 250,000 had to obtain NPDES permits. Initial application deadlines for large and medium municipalities were November 16, 1992 and May 17, 1993, respectively. As part of their individual NPDES permit applications, the large and medium MS4s had to develop a stormwater management program (SWMP).
Individual MS4 permits for discharge of stormwater
The Phase II regulations address stormwater runoff of MS4s serving populations less than 100,000, called small MS4s. More particularly, small MS4s located partially or fully within urbanized areas (UAs), as determined by the U.S. Bureau of the Census, and also on a case-by-case basis for those small MS4s located outside of UAs that Ohio EPA designates into the program. Automatically designated Small MS4s, those in UAs, were required to apply for permit coverage and develop and submit a SWMP by March 10, 2003.
U.S. EPA developed a fact sheet explaining how urbanized areas affect water quality through increased runoff and pollutant loads and what homeowners can do to prevent stormwater pollution.
Ohio EPA developed two general permits that were issued to Phase II Small MS4 communities under the first generation permitting in 2003. The Baseline General Permit allowed a full 5 years for SWMP development/implementation; whereas, the Alternative General Permit for MS4s Located within Rapidly Developing Watersheds required development/implementation of the Construction and Post-Construction minimum control measures within 3 years. The alternative general permit was issued to a select group of MS4s that Ohio EPA considered being located within rapidly developing watersheds. All MS4s will now be covered under the general permit renewal that was issued on January 31, 2009
U.S. EPA developed a set of digitized maps which display detailed urbanized area maps. See the following link:
Ohio EPA developed a set of digitized maps which display detailed area maps for watersheds that Ohio EPA has identified as being rapidly developing. See the following link:
Regulated Small MS4s
Dischargers Covered Under Stormwater Discharge General Permits
Small MS4 Informational Materials
- Ohio EPA MS4 Workshops
- U.S. EPA Stormwater Phase II Fact Sheets
- U.S. EPA National Menu of Best Management Practices
- U S. EPA Measurable Goals Guidance for Phase II Small MS4s
- U.S. EPA Stormwater Phase II Compliance Assistance Guide
- Ohio EPA Guidance Brochure for Phase II Small Municipal Separate Storm Sewer System (MS4) Operators
- U.S. EPA Stormwater Case Studies
- U.S. EPA Nonpoint Source Outreach Toolbox
Electronic Small MS4 Annual Report
Required for use by Small MS4 operators to submit annual reports. Small MS4 annual reports are due on April 1.
Regulated Small MS4s' 2019 annual reports are due, on or before, April 1, 2020. Beginning February 1, 2017 these reports can be submitted electronically via Ohio EPA's eBusiness Center. For a step-by-step walkthrough on entering and submitting the electronic report view the MS4 Annual Report Quick Guide. If you have any questions on submitting your Small MS4 annual report electronically, please contact the Division Surface Water's Central Office at (614) 644-2001.
Potential Funding Sources
- Ohio Environmental Education Fund
- Ohio Water Pollution Control Loan Fund
- Stormwater Utility Information
- Catalog of Federal Funding Sources for Watershed Protection
Oil & Gas
Oil and Gas-General Permit (OHCG00001)
- Oil and Gas Exemption - U.S. EPA web page
- Storm Water Permitting for Oil- and Gas-Related Operations - Ohio EPA fact sheet
Additional Stormwater Information
- U.S. EPA Stormwater Program Page
- Recommendations for Salt Storage - Guidance for Protecting Ohio's Water Resources
Stormwater Training & Outreach
The Ohio Storm Water Association (OSWA) is a group of public and private citizens dedicated to advancing the management of storm water and related natural resources through education, leadership, watershed-based coordination and technical assistance in Ohio. OSWA provides educational and networking opportunities for people focused on reducing the negative impacts of storm water runoff. The OSWA provides educational meetings on topics of interest to our members and sponsors the Ohio Storm Water Conference held each spring. This link will redirect you from Ohio EPA's website to the OSWA website:
The Northeast Ohio Storm Water Training Council (NEOSWTC) was formed in 2008 to better coordinate stormwater related training and education opportunities for NPDES Phase 2 regulated communities across Northeast Ohio. The Council is a consortium of organizations that educate, train and/or guide curriculum development on storm water related issues. The Council is comprised of more than 28 agencies and organizations whose members/employees are professionals specializing in various aspects of stormwater regulations. The following link will redirect you from Ohio EPA's website to the NEOSWTC website:
Tempest in a Channel: Stormwater Runoff's Impact on Urban Streams
Tempest in a Channel: Stormwater Runoff's Impact on Urban Streams is a 15-minute program that explains in general terms how the actions of private citizens can contribute to pollution of stormwater runoff, and how increased areas of impervious surface that result from new development create increased volumes of runoff that have to be managed.
The video also discusses how "low-impact development" concepts can be incorporated into new construction projects to better manage the increased volumes of stormwater runoff typically created from new development. Reducing the amount of runoff, or relying on existing natural features at a site, often can lead to cheaper, more effective storm water management strategies. In the short-term, costs are lowered because less piping or other infrastructure is required. Over the long-term, savings can be realized because fewer controls require less maintenance, and natural controls do not need to be replaced.
The Muck Stops Here: Construction Site Erosion and Sediment Control Basics
Ohio EPA, in cooperation with the Summit Soil & Water Conservation District, produced an 11-minute video highlighting preferred approaches for pollution control from regulated construction projects. The Muck Stops Here: Construction Site Erosion and Sediment Control Basics is a training tool that provides specific examples of effective practices seen at active construction sites. It targets local inspectors who enforce municipal storm water regulations and have a basic knowledge of sediment and erosion control requirements.
Central Office Stormwater Permitting Staff
|Jason Fyffe||Section Manager||614-728-1793|
|Wesley Sluga||Section Supervisor||614-644-2141|
|Lynette Hablitzel||Statewide Stormwater Coordinator||419-373-3009|
District Office Stormwater Staff
|Dan Bogoveski||NEDO Supervisor||330-963-1145|
|Zorica Dejanovic||Stark, Carroll, Columbiana, Mahoning, and Trumbull||330-963-1222|
|Laura Shriver||Cuyahoga, Lake, Lorain, Geauga, and Holmes||330-963-1136|
|Ed Wilk||Ashtabula, Medina, Portage, Summit, and Wayne||330-963-1172|
|Marshall Cooper||Delaware, Franklin, Fayette, Madison, Morrow, and Pickaway
(areas west of I-71) Fairfield, Knox, Licking, and Union
|Rahel Babb||Delaware, Franklin, Fayette, Madison, Morrow, and Pickaway
(areas east of I-71)
|Alex Delvalle||All Counties||740-380-5227|
|Michelle Flanagan||Clark, Darke, Hamilton, Logan, Miami, Montgomery, Preble, and Shelby||937-285-6440|
|Laura Marshall||Brown, Butler, Champaign, Clermont, Clinton, Greene, Highland, and Warren||937-285-6031|
|Jacqueline Kniss||Allen, Auglaize, Defiance, Fulton, Hancock, Hardin, Henry, Marion, Mercer, Paulding, Putnam, Van Wert, Williams, and Wood||419-373-3025|
|Stefen Pargeon||Ashland, Crawford, Erie, Huron, Lucas, Ottawa, Richland, Sandusky, Seneca, and Wyandot||419-373-3021|
Central Office Stormwater Technical Assistance Staff
|Justin Reinhart||Stormwater Engineer||614-705-1149|