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. 2011 Feb 28;6(2):e17407. doi: 10.1371/journal.pone.0017407

Table 4. Frequency of pollutants listed by section 303(d) of the Clean Water Act for catchments in networks 5, 8, and 9.

303(d) pollutant Count
Sedimentation/siltation 192
Temperature 96
Nutrients 16
Sediment 15
Organic enrichment/dissolved oxygen 13
Others 6

The counts of sediment/siltation and temperature are likely due to incompatible forestry.