Probability Surveys of Aquatic Resources in EPA Region 10 | Region 10 | US EPA

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Probability Surveys of Aquatic Resources in EPA Region 10

The Environmental Monitoring and Assessment Program (EMAP) was developed by EPA to assess the condition of the nation’s ecological resources. EMAP has two primary features, the use of ecological indicators and a probability-based design. In Region 10, EMAP studies have been conducted by the States starting in 1993.

Currently, the EPA Region 10, the Office of Water, the Office of Research and Development, States, and Tribes are conducting a series of national aquatic resource surveys. These studies are built upon the earlier EMAP work. These national surveys use a probability-based design to report on core indicators of water condition using standardized field and lab methods. The surveys include a national quality assurance program and are designed to yield unbiased, statistically-representative estimates of the condition of aquatic resources.

The types of aquatic resources are: rivers and streams, lakes, coastal waters and wetlands.

For additional information, please contact Gretchen Hayslip ( or Lillian Herger (

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