OAC Chapter 3745-1 Water Quality Standards 

The following is a complete list of the rules in Chapter 3745-1 of the Ohio Administrative Code.  A description of the contents of this chapter is available here. This description includes a link to tables summarizing the aquatic life and human health numerical water quality criteria and values contained in and developed pursuant to this chapter.

May 10, 2016 - The Agency adopted final Water Quality Standards Program rules in OAC Chapter 3745-1. The effective date of the amended rules is August 10, 2016.  Go to the Proposed Rules tab for additional information.

October 4, 2016 - The Agency adopted final Water Quality Standards beneficial use designation rules in OAC Chapter 3745-1.  The effective date of the rules is January 2, 2017.  Go to the Proposed Rules tab for additional information.

November 8, 2016 - The Agency adopted the final reorganization of the Water Quality Standards rules in OAC Chapter 3745-1.  The effective date of the rules in February 6, 2017.  Go to the Proposed Rules tab for additional information.

List of variances pursuant to paragraph (D)(12) of OAC 3745-33-07.

Download the entire Chapter 3745-1 here, or download individual rules below.

The Water Body Use Designation Index  is an alphabetical listing of the water bodies in rules 3745-1-08 to 3745-1-32 with their associated rule and page numbers.

  • 3745-1-08 Hocking river drainage basin 

  • 3745-1-09 Scioto river drainage basin 

  • 3745-1-10 Grand river drainage basin  

  • 3745-1-11 Maumee river drainage basin 

  • 3745-1-12 Sandusky river drainage basin 

  • 3745-1-13 Central Ohio tributaries drainage basin 

  • 3745-1-14 Ashtabula river drainage basin

  • 3745-1-15 Little Beaver creek drainage basin

  • 3745-1-16 Southeast Ohio tributaries drainage basin

  • 3745-1-17 Southwest Ohio tributaries drainage basin 

  • 3745-1-18 Little Miami river drainage basin

  • 3745-1-19 Huron river drainage basin 

  • 3745-1-20 Rocky river drainage basin 

  • 3745-1-21 Great Miami river drainage basin 

  • 3745-1-22 Chagrin river drainage basin 

  • 3745-1-23 Portage river drainage basin 

  • 3745-1-24 Muskingum river drainage basin  

  • 3745-1-25 Mahoning river drainage basin 

  • 3745-1-26 Cuyahoga river drainage basin 

  • 3745-1-27 Black river drainage basin

  • 3745-1-28 Vermilion river drainage basin 

  • 3745-1-29 Wabash river drainage basin 

  • 3745-1-30 Mill creek drainage basin 

  • 3745-1-31 Lake Erie standards 

  • 3745-1-32 Ohio river standards 

  • 3745-1-33 Water quality criteria for the lake Erie drainage basin 

  • 3745-1-34 Water quality criteria for the Ohio river drainage basin 

  • 3745-1-35 Site-specific modifications to criteria and values 

  • 3745-1-36 Methodologies for development of aquatic life criteria and values 

  • 3745-1-37 Methodology for deriving bioaccumulation factors 

  • 3745-1-38 Methodologies for development of human health criteria and values for the lake Erie drainage basin 

  • 3745-1-39 Methodology for development of wildlife criteria for the lake Erie drainage basin 

  • 3745-1-50 Wetland definitions 

  • 3745-1-51 Wetland narrative criteria 

  • 3745-1-52 Numeric chemical criteria for wastewater discharges to wetlands 

  • 3745-1-53 Wetland use designation 

  • 3745-1-54 Wetland antidegradation