Data and Tools
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Applications and Uses for DFLOW
This page talks about a DFLOW case study and the ability of the EPA and states to evaluate alternative flow statistics.
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NHDPlusV1 Documentation
Metadata, training resources, presentations, and other documentation for NHDPlus version 1.
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Downloading STORET Data Help
storet data warehouse help information
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NHDPlusV1 Great Lakes Data
NHDPlus Version 1 data for the Great Lakes vector processing unit.
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NHDPlusV1 HUC8 Dataset
A listing of HUC8 datasets by vector processing unit.
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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.