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 firstname.lastname@epa.ohio.gov 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.

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

Credible Data - References

Credible Data is a program that classifies surface water monitoring performed by watershed groups, state agencies, schools, local volunteers and other organizations. Ohio EPA uses the data submitted under the program in ways prescribed by State law.

Parameters Sampled and Testing Methods

Level 1 and Level 2 Data

U.S. EPA has conducted national surveys to determine the most frequently tested parameters used in citizen based voluntary monitoring programs. To ensure that data on these commonly sampled parameters is credible for its intended use, refer to the link below to identify some of the sampling and analytical methods suitable for Level 1 and Level 2 projects.

Commonly Sampled Parameters

  • Acidity
  • Conductivity
  • Phosphorus
  • Turbidity
  • Benthic insects
  • Alkalinity
  • Dissolved Oxygen
  • pH
  • Total suspended residue
  • Stream flow
  • Ammonia (as N)*
  • Nitrate
  • Temperature
  • Bacteria*
  • Water transparency


* This parameter is only available using Level 2 methods.

Examples of Acceptable Analytical Methods

Level 3 Data

Level 3 studies could involve the sampling for a wide variety of parameters. Analytical methods must adhere to those published in any one of a number of commonly recognized method manuals. See paragraph (C) of rule 3745-4-06 [PDF 25K].