B. Water Quality Data

4. Attainment Status

The attainment status (below) is determined from the three indices mentioned above at each site.

Attainment Status = ICI + IBI + MIwb (if available)

Full Attainment – All available indices meet or exceed these scores for their assigned category

Partial Attainment – One or more indices does not meet scores and performance is fair

Non Attainment – All indices fail to attain or any index indicates poor or very poor performance

In the example on Big Darby, the Fish (IBI and MIwb) were meeting the Exceptional Waterwater Habitat (EWH) criteria but the bugs (ICI) were only meeting the Warmwater Habitat (WWH).  Since only two of the three indices meet the EWH designated use, Big Darby Creek at river mile 66.0 is in Partial Attainment.  The designated use of this stream segment is not lowered to a WWH because it has the potential to recover back to full attainment of the EWH based on surrounding stream segments.

The attainment status of the 127 sampling sites in 2001 and 2002 by Ohio EPA is displayed in Map 20. 

Back to Table of Contents