**4.3 Summary of** *wetland resource quality* **in the conterminous US**

The results of the 2011 NWCA indicates that the *wetland resource quality* across the conterminous US is good for about half of the wetland area, with the remainder divided between fair and poor *wetland resource quality* (**Figure 5**). Physical, chemical, and biological data collected in the field can also be used to evaluate factors that impact wetland resource quality. Review of the patterns in relative extent of the examined indicators of stress that were found at high stressor level, shows that specific physical stressors and the biological stressor were the most frequently encountered and may affect wetland resource quality, while chemical indicators of stress are less common at high stressor levels (**Figure 6**). The effect of stressors on *wetland resource quality* is illustrated by the relative risk results (**Figure 6**), which show that physical indicators of stress occurring at high stressor levels are likely to impact *wetland resource quality*.
