Contaminant Source Inventory
and Assessment Tools
EPA Technical Assistance Documents
SWAP Guidance - Appendix D:
Conjunctive Delineation of the Zone of Ground Water Contribution and the Area of Surface Water Contribution to Public Water Systems
Drinking Water Source Indexes: These two indexes identify 1) regulated drinking water contaminants and the activities that may use, produce or release these substances and 2) some potential facilities and activities where one might find the contaminants referred to as primary and secondary drinking water standards. The listing of a contaminant does not mean that it will always occur at the associated source, nor does it encompass all contaminants that may be present.
Envirofacts - retrieve environmental information from EPA databases on Air, Chemicals, Facility Information, Grants/Funding, Hazardous Waste, Risk Management Plans, Superfund, Toxic Releases, and Water Permits and Drinking Water, including the Safe Drinking Water Information System and National Drinking Water Contaminant Occurrence Database. Online queries allow users to retrieve data from these sources and create reports, or to generate maps of environmental information by selecting from several mapping applications available through EPA's Maps On Demand.
STORET - STORET is a repository for water quality and biological monitoring data, and is used by state environmental agencies, EPA staff, Federal agencies, and many others.
Surf Your Watershed - A service to help you locate, use, and share environmental information on your watershed or community.
USGS Real Time Water Data
 - This Hammer Award- winning site provides real-time river flow information for thousands of locations, including drought and flood conditions.
BASINS - Better Assessment Science Integrating Point and Nonpoint Sources (BASINS) integrates a geographic information system (GIS), national watershed data, and state-of-the-art environmental assessment and modeling tools
SPARROW
- This model and it's digital framework (derived from EPA's river reach file RF-1) provides a nationally consistent method for segmenting large source areas. The USGS model can also be used to address a variety of questions, including travel times, probabilities of accedence of concentrations for contaminants at selected locations within the source-area watersheds, and relative contributions of different sources and subbasins to contaminant concentrations near the PWS intakes.
State 305(b) reports - General information on ground water quality nationwide, summarized from State 305(b) reports.
Federal Index of Information
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