Water: National Wetland Condition Assessment
National Wetland Condition Assessment
Features
Field crews sampled 1,179 sites from Florida to Alaska this summer in the first-ever national survey on the ecological condition of the Nation's wetlands.
Over the next year EPA and its State, Tribal, and Federal partners will process the field samples, assure the quality of the data collected, and begin to analyze the data. A report detailing the results of the survey will be released in 2013.
EPA and its State, Tribal, and Federal partners are implementing the first-ever national survey on the condition of the Nation's wetlands. The survey is designed to provide regional and national estimates of wetland ecological integrity and rank the stressors most commonly associated with poor conditions. The process of designing and conducting the survey is also intended to help build state and tribal capacity to monitor and analyze wetland condition while promoting collaboration across jurisdictional boundaries.
The National Wetland Condition Assessment (NWCA) will use a probability-based sampling design to provide statistically-valid estimates of condition for a population of wetlands. States, tribes and federal partners will participate in the NWCA design, planning, and field assessment. A consistent field assessment procedure will be used for the NWCA to ensure that the results can be compared across the country.
Once complete, and in concert with similar surveys on the Nation's coastal waters, wadeable streams, rivers, and lakes, the NWCA will inform decision-making on how to better protect, maintain, and restore water-quality to the Nation's aquatic resources.
If you have questions or comments on the National Wetland Condition Assessment, please feel free to email Michael Scozzafava, Chris Faulkner, or Gregg Serenbetz.
National Wetland Condition Assessment: Fact Sheet (PDF) (2 pp, 315K, About PDF)
Information on CWA Section 106 Monitoring Initiative Guidelines
The NWCA survey design was produced by EPA's Office of Research and Development in collaboration with the U.S. Fish and Wildlife Service (US FWS). The US FWS Wetland Status and Trend program provided the first stage design, consisting of 5,048 two mile by two mile plots stratified by state and physiographic region. The first stage identifies land cover types within each plot. The second stage is a Generalized Random Tessellation Stratified (GRTS) survey design for an area resource applied to the stage one sample plots. The second stage survey design is stratified by state and the unequal probability of selection is by seven wetland categories.
More detailed information on the design and sample frame is provided in the following presentation:
National Wetland Condition Assessment Sample Frame (PDF) (11 pp, 876K, About PDF)
Information on monitoring of aquatic resources in the US, primarily focused on design and analysis of probability based surveys is available on the following web page:
Aquatic Resources Monitoring Web Site