{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Steven Sobieszczyk", "hasEmail": "mailto:ssobie@usgs.gov"}, "description": "Under section 303(d) of the 1972 Clean Water Act, states, territories, and authorized tribes are required to \ndevelop lists of impaired waters. These impaired waters do not meet water quality standards that states, \nterritories, and authorized tribes have set for them, even after point sources of pollution have installed the \nminimum required levels of pollution control technology. The law requires that these jurisdictions establish \npriority rankings for waters on the lists and develop TMDLs for these waters\u201d (U.S. Environmental Protection \nAgency, 2011). Waterways represented in this data set are a subset of these EPA 303 (d) listed streams \nthat were classified as nutrient impaired. Nutrient impaired streams include those listed for nutrients, \nagriculture, crop sources, pH, dissolved oxygen, chlorophyll a, nitrate, phosphorus, and nitrogen. Total \nphosphorus and total nitrogen values attributed to stream reaches are based on EPA Level III Ecoregions \naggregations for the National Nutrient Strategy values (U.S. Environmental Protection Agency, 2000). \nValues are based on 25th percentiles for aggregate nutrient reference conditions for both phosphorus \nand nitrogen. Data relate to a 2002 time period, with data collected from each of the state agencies \nas close to that period as possible. See processing steps for more detail on individual state data sets \nand time periods.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P93R6LVP", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.225ac508-529b-4f60-804e-99645327988a.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_225ac508-529b-4f60-804e-99645327988a", "keyword": ["303d", "Columbia River Basin", "DO", "Idaho", "Montana", "Nevada", "Nitrogen", "Nutrients", "Oregon", "Phosphorus", "Puget Sound", "USGS:225ac508-529b-4f60-804e-99645327988a", "Washington", "Wyoming", "contaminants", "environment", "geoscientificInformation", "impaired", "inlandWaters", "pH"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-127.053324, 40.079098, -110.831100, 50.520295", "theme": ["geospatial"], "title": "Nutrient Impaired 303(d) Streams for the Pacific Northwest"}