The data collected in these assessments are used to characterize aquatic life impairment and to help diagnose the cause of this impairment. These three indices are based on species richness, trophic composition, diversity, presence of pollution-tolerant individuals or species, abundance of biomass, and the presence of diseased or abnormal organisms. Ohio EPA uses the results of sampling reference sites to set minimum criteria index scores for use designations in water quality standards. The antidegradation policy describes the conditions under which water quality may be lowered in surface waters. Existing beneficial uses must be maintained and protected.
Any interested individuals can have a role in the process of developing water quality standards.
Ohio EPA reviews and, as appropriate, revises water quality standards at least once every three years. When water quality standards revisions are proposed, the public is notified of these revisions. A public hearing is held to gather input and comments. The Division will consider the recommendations of the EAGs when revising the rules. The State of Ohio disclaims liability for any errors or omissions.