ET-3A1 (2/1/05 version)
Environmental Targets And Priorities Overview: Key NPS Causes Of Surface Water Quality Nonattainment
| 2004 Integrated Report Statistics, Watershed Assessment Units (WAUs) | |||
|---|---|---|---|
| Total Number Ohio WAUs: | 331 | ||
| Number WAUs Monitored (1993-2002): | 249 | ||
| Number WAUs Impaired: | 242 | ||
| Number Ohio WAUs Unassessed: | 75 | ||
Details for each individual assessed WAU are available in the 2004 Integrated Water Quality Monitoring and Assessment Report
| Table 1. WAU Recreational Use Impairments Caused by Bacteria | ||||
| Number WAUs monitored | Number WAUs Impaired | % of Monitored Total | ||
| 151 | 103 | 68% | ||
88% (198 out of 225) of WAUs assessed for aquatic life use attainment have at least one stream/river impaired by at least one NPS-related cause. Specifics are summarized in Table 2 and associated hyperlinks.
| Table 2. WAU Aquatic Life Use Impairments, by NPS-related Causes* | ||||
| NPS cause | Number WAUs monitored | Number WAUs Impaired | % of Monitored Total | |
| Silt/sediment | 225 | 117 | 52% | |
| Contaminated sediment | 225 | 11 | 5% | |
| Nutrients | 225 | 94 | 42% | |
| Habitat Modification | 225 | 137 | 61% | |
| Hydromodification | 225 | 102 | 45% | |
| * NPS causes (PDF 49kb)are listed as high magnitude for at least one stream/river within the WAU | ||||
| 2004 Integrated Report Statistics, Large River Assessment Units (LRAUs) | |||
|---|---|---|---|
| Total Number Ohio LRAUs: | 23 | ||
| Number LRAUs Monitored (1993-2002): | 22 | ||
| Number LRAUs Impaired: | 20 | ||
| Number Ohio LRAUs Unassessed: | 1 | ||
Details for each individual assessed LRAU are available in the 2004 Integrated Water Quality Monitoring and Assessment Report.
| Table 3. LRAU Recreational Use Impairments Caused by Bacteria | ||||
| Number LRAUs monitored | Number LRAUs Impaired | % of Monitored Total | ||
| 15 | 9 | 60% | ||
62% (13 out of 21) LRAUs assessed for aquatic life use attainment are impaired by at least one NPS-related cause. Specifics are summarized in Table 4 and associated hyperlinks.
| Table 4. LRAU Aquatic Life Use Impairments, by NPS-related Causes* | ||||
| NPS cause | Number LRAUs monitored | Number LRAUs Impaired | % of Monitored Total | |
| Silt/sediment | 21 | 7 | 33% | |
| Contaminated sediment | 21 | 3 | 14% | |
| Nutrients | 21 | 5 | 24% | |
| Habitat Modification | 21 | 9 | 43% | |
| Hydromodification | 21 | 7 | 33% | |
| * NPS causes (PDF 8kb) are listed as high magnitude for at least one reach within the LRAU | ||||