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Ohio's water quality standards, set forth in Chapter 3745-1 of the Ohio Administrative Code (OAC), include four major components: beneficial use designations, narrative "free froms", numeric criteria, and. antidegradation provisions. Brief summaries of these components are below. For a more detailed summary, see:
Ohio Water Quality Standards 3745-1-01 through 3745-1-44 and 3745-1-50 through 3745-1-54 (pdf) (9.52 MB) (Effective September 17, 2024) This document establishes water quality requirements for all surface waters of the state.
Ohio's water quality information from our final 2020 Integrated Water Quality Monitoring and Assessment Report is included along with permitted discharger, drinking water and nonpoint source program grant project information on a watershed basis.
Drinking Water Standards for Ohio Public Water Systems September 2018. I. Primary Standards (Ohio Administrative Code Chapter 3745-81) II. Secondary Standards (Ohio Administrative Code Chapter 3745-82) III. Disinfection Requirements (Ohio Administrative Code Chapters 3745-81 and 3745-83)
EPA has compiled state, territorial, and authorized tribal water quality standards that EPA has approved or are otherwise in effect for Clean Water Act purposes. This compilation is continuously updated as EPA approves new or revised WQS.
In 2000, Ohio EPA embarked on a systematic assessment of watersheds for Total Maximum Daily Load (TMDL) development and data from ambient stations has proved useful for water quality modeling and trend assessment purposes.
Water Quality Standards Regulations: Ohio. Presented below are water quality standards in effect for Clean Water Act (CWA) purposes for this state. EPA is posting these standards as a convenience to users and has made a reasonable effort to assure their accuracy.
Ohio Water Quality Standards, OAC 3475-1, chapters 50-54. Presented below are water quality standards that are in effect for Clean Water Act purposes. EPA is posting these standards as a convenience to users and has made a reasonable effort to assure their accuracy. Additionally, EPA has made a reasonable effort to identify parts of the ...
Ohio EPA DSW is conducting a Triennial Review of Ohio’s WQS, a process required by the federal Clean Water Act (40 CFR 131.20). This review helps keep states’ WQS up to date by
Drinking & Ground Waters. Ensures compliance with the federal Safe Drinking Water Act and evaluates potential threats to source waters that supply Ohio's more than 4,800 public drinking water systems.