Data and Tools
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Water Quality Exchange Web V 2.0 Functionality
This page details the changes in the second version of WQX Web.
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Definition and Characteristics of Low Flows from DFLOW
This page provides background information on the definition and characteristics of low flows, the relationship between low flows and aquatic life criteria and design flows.
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NHDPlusV1 Data
The collection of data for all vector processing units of NHDPlus version 1.
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NHDPlusV1 Rio Grande Data
NHDPlus Version 1 data for the Rio Grande vector processing unit.
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NHDPlusV1 Mississippi Data
NHDPlus Version 1 data for the Mississippi vector processing unit.
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Safe Drinking Water Information System
This page contains basic information, links, and tools related to the safe drinking water information system.
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NHDPlusV1 South-Atlantic Gulf Data
NHDPlus Version 1 data for the South-Atlantic Gulf vector processing unit.
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NHDPlusV1 Pacific Northwest Data
NHDPlus Version 1 data for the Pacific Northwest vector processing unit.
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2016 TRI National Analysis Dioxin and Dioxin-like Compounds and TEQ Data Files
Toxic equivalents (TEQs) allow for a better understanding of the toxicity of releases and waste management activities at facilities that report to the TRI Program.
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Options for Modernizing Public Hearings for Water Quality Standard Decisions Consistent with 40 CFR 25.5
Provides suggestions for states and WQS-authorized tribes on how they could modernize – that is, incorporate technologies into – their Water Quality Standards (WQS) public hearing process consistent with federal public hearing requirements at 40 CFR 25.5.
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South Platte River Contributing Headwater Basins in Colorado
Headwater Basins that contibute to the South Platte River in CO.
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Project Resources Needs for Proctor Creek Watershed
Estimated costs for partnership operations and projects in Proctor Creek
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South Platte River Basin
Map of South Platte River Basin
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Narrative Water Quality Criteria Related to Trash and Plastics
To address the public health problem of trash in our waterways, it is important to first identify and adopt trash criteria and then identify a way to implement such criteria in an effective manner.
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2023 Appendix W Proposed Rule
On October 12, 2023, the Administrator signed a propose rule that revises the Guideline on Air Quality Models. This webpage provides the background material related to this proposed rule for stakeholder reference.
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National Priorities List (NPL) Sites - by State
View the National Priorities List (NPL), organized by state. Use the interactive map to select a state or territory.
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National Priorities List (NPL) Sites - by Site Name
View the National Priorities List (NPL), ordered alphabetically by site name.
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National Priorities List (NPL) Sites - by Listing Date
View the National Priorities (NPL), ordered chronologically by listing date.
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List 8R Active Site Inventory
View the active Superfund site inventory, at which site assessment, removal, remedial, enforcement, cost recovery, or oversight activities are being planned or conducted.
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List 10 - Contaminants at CERCLIS Sites
View a list of contaminants recorded for Superfund sites, including the contaminant Chemical Abstract Service (CAS) number and maximum concentration level.