The Ohio-Kentucky-Indiana Regional Council of Governments (OKI) maintains the Water Quality Management Plan for Butler, Clermont, Hamilton and Warren Counties in southwest Ohio.  Water Quality Management Plans are required by Section 208 of the federal Clean Water Act to identify water pollution problems in metropolitan areas and recommend how to address them.  By federal law, states cannot issue discharge permits for wastewater treatment facilities that conflict with regional plans.  We work with local governments to determine who provides sewer service and the areas in which it will be provided, so that duplication of effort is avoided.

On September 10, 2020 OKI’s Board of Directors adopted Amendment #45 to the Water Quality Management Plan for Butler, Clermont, Hamilton and Warren Counties. Amendment #45 updates Chapters 4 & 7 of the WQM Plan for the Ohio portion of the OKI region with current information about onsite treatment systems and areas with centralized sewer service and wastewater treatment facilities. Amendments are undertaken periodically to reflect changing circumstances.

Wastewater Treatment Facilities, Facility Planning Areas and Sewer Service Areas in Butler, Clermont, Hamilton and Warren Counties
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Executive Summary

Table of Contents
Chapter 1 – Introduction and Overview
Chapter 2 – Water Resources in Southwest Ohio
Chapter 3 – Current and Projected Development
Chapter 4 – Management of On Site Systems
Chapter 5 – Management of Nonpoint Sources of Pollution
Chapter 6 – Watershed Planning in Southwest Ohio
Chapter 7 – Wastewater Facilities Planning
Chapter 8 – Ongoing Areawide Water Quality Management Planning
Appendix A – Watershed and Large River Assessments
Appendix B – Stream Database Guide | Stream Database Glossary | Download GIS Shapefiles (Compressed ZIP file)
Appendix B –  Stream Database
Appendix C – Impervious Surface Analysis