Where can I find information on the U.S. Environmental Protection Agency’s (USEPA) recommended ecoregional nutrient criteria?
“The intent of EPA’s recommended ecoregional nutrient criteria is to identify baseline conditions of surface waters that are minimally impacted by human activities and protect against the adverse effects of nutrient over-enrichment from cultural eutrophication. Nutrient criteria are numerical values for both causative (phosphorus and nitrogen) and response (chlorophyll a and turbidity) variables associated with the prevention and assessment of eutrophic conditions” (USEPA, 2000; http://www.epa.gov/waterscience/criteria/nutrient/ecoregions/factsheet.html). USEPA has developed recommended criteria for nitrogen and phosphorus in rivers and streams for different geographic regions (Ecoregions) of the country (See USEPA Water Quality Criteria for Nitrogen and Phosphorus Pollution web site http://www.epa.gov/waterscience/criteria/nutrient/ecoregions/rivers/index.html). The summary table of values for USEPA Regional Nutrient Criteria for total nitrogen and total phosphorus used in this USGS s
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