As a precautionary response to COVID-19, Ohio EPA is currently operating with most staff working remotely. If you are working with our staff on a current project and you know the name of the employee you are working with, email them at or call them directly. The Agency website has contact information for every district, division, and office. In order to reach us, please contact Ohio EPA’s main phone line at (614) 644-3020 or the main line for the division or office you are trying to reach.

After March 23, our district offices and Central Office will be temporarily closed and will have increasingly limited ability to receive deliveries, plans, etc. All entities are encouraged to submit plans, permit applications, etc., electronically where there are existing avenues to do so, such as the eBusiness Center (eBiz). Please refer to the list of available services on the main eBiz webpage. We encourage you to make use of all that apply, even if you have not used eBiz in the past. Plans under 25 MB can be emailed. For large plans over 25 MB, entities should work with the reviewer/division to upload via LiquidFiles. Directions for submitting docs via LiquidFiles is available on YouTube. We apologize for the inconvenience and thank you in advance for your understanding. If you wish to send hard copies of documents to any of Ohio EPA’s district offices, the best method to ensure we receive these documents is to send them via U.S. Mail. Since all offices are closed, deliveries outside of U.S. Mail (FedEx, UPS) will likely be returned because the offices are closed and deliveries cannot be made.

To report a spill or environmental emergency, contact the spill hotline (800) 282-9378 or (614) 224-0946

Emission Monitoring Unit (Testing Group)

The responsibility of the Emission Monitoring Unit is to provide source testing guidance for the regulated community in Ohio.
The Active National Directory of Source Emissions Testing provides a listing of stack testing firms in Ohio.

For questions concerning source testing, contact Todd Brown.

Intent to Test Notification

The most recent version of the Intent to Test notification form is also available:

Emissions Test Methods

Ohio EPA offers links to the U.S. EPA Emissions Measuring Technical Information Center to ensure delivery of the most up-to-date information possible regarding testing methods.

Testing Guidance Documents

These guidance documents are downloadable files in Word Perfect format. You must first unzip the files to view them.




Effective Duct Area Calculation for Ducts with Sediment Build-up


Acronyms Used in Emission Measurement Discussions and Regulations


Guidelines for Determining Capture Efficiency


Revised Capture Efficiency Guidance for Control of Volatile Organic Compound Emissions


Particulate Sampling in Cyclonic Flow


Derivation of Delta H

DQO.ZIP (139 K)

Guidance for the Data Quality Objectives Process


Evacuated Cylinder Procedure


Explanation of Ohio EPA's "Test at Max" Policy for Requiring Performance Testing to be Conducted While Emission Units Operate at Maximum Capacity

25VS25A [PDF]

Guidance Regarding the Use of Methods 25 and 25a for Measuring Gas Stream Volatile Organic Compounds (VOCs) Concentration

26VS26A. [PDF]

Background Paper for Method 26 and 26a


Determination of Stack Gas Velocity and Volumetric Flow Rate (Three-dimensional Pitot Tube)


Isokinetic Equation for Method 5d


Stack Test Summaries (updated 10/13/15)

Testing Audit Program

Ohio EPA participates in U.S. EPA's stationary source testing audit program. Visit the U.S. EPA Emissions Measurement Center's Technical Support website to access information regarding which test methods have audits available and how to order audit samples. Audits provide a means for improved quality assurance of laboratory analyses and other aspects of source testing that may otherwise go unwitnessed and under-scrutinized.

Audits are required to be employed whenever samples are available. For more information, contact Todd Brown.

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