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USGS Home Contact USGS Search USGS National Water Information System: Web Interface
USGS Water Resources		Data Category: Home Current Conditions Site Information Mapper Surface Water Groundwater Water Quality	Geographic Area: United States Alabama Alaska American Samoa Arizona Arkansas California Colorado Connecticut Delaware Dist. of Columbia Florida Georgia Guam Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Northern Mariana Islands Ohio Oklahoma Oregon Pennsylvania Puerto Rico Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virgin Islands Virginia Washington West Virginia Wisconsin Wyoming

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Parameter Code Definition

Search Criteria
	Parameter groupings -- List all parameters in a group All -- include all parameter groups Information Physical Inorganics, Major, Metals Inorganics, Major, Non-metals Nutrient Microbiological Biological Inorganics, Minor, Metals Inorganics, Minor, Non-metals Toxicity Organics, pesticide Organics, PCBs Organics, other Radiochemical Stable Isotopes Sediment Population/Community Other Habitat
	Parameter code/name -- Enter a code or name (matches any part)
	CASRN -- For best result, enter full CASRN with dashes. For example, "7439-97-6" (CAS Registry NumberŪ is a Registered Trademark of the American Chemical Society. CAS recommends the verification of the CASRNs through CAS Client ServicesSM.)
	USEPA SRS -- Matches any part. For example, "phosphorus" retrieves SRS names "Phosphorus", " Organic phosphorus" and " Phosphate-phosphorus". (Definition)

Choose output format
	Parameter code information displayed in table format tab-separated format     --saved to file     --saved to compressed file
	Select additional fields to include with the parameter code output:         Group Name Parameter Name/Description CASRN USEPA SRS Parameter Unit