Water Budget Data Finder

Irrigation professionals using the WaterSense Landscape Water Budget Tool may use the Water Budget Data Finder to determine peak watering month and the appropriate evapotranspiration and rainfall values for a specific United States zip code.

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Water Quality Assessment and Total Maximum Daily Loads Information

This site provides information reported by the states to EPA about the conditions in their surface waters. This information is required every two years under Clean Water Act Sections 305(b) and 303(d). Because of differences in state assessment methods, the information in this site should not be used to compare water quality conditions between states […]

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Nutrient Indicators Dataset

As part of EPA’s ongoing efforts to work collaboratively with states and other partners to accelerate nutrient load reductions and state adoption of numeric nutrient criteria, and as outlined in a March 2011 Nutrient Framework memorandum, EPA has developed the Nutrient Indicators Dataset. This Dataset consists of a set of indicators and associated state-level data […]

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NHDPlus

NHDPlus is a geo-spatial, hydrologic framework dataset envisioned by the US Environmental Protection Agency. The EPA Office of Water, assisted by the US Geological Survey, has supported the development of NHDPlus to enhance the EPA Watershed Assessment, Tracking & Environmental Results (WATERS) activities and the USGS National Water Quality Assessment (NAWQA) Program’s SPARROW modeling. Since […]

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ROE Gulf of Mexico Hypoxia Data

This dataset describes dissolved oxygen levels in the Gulf of Mexico. Individual sampling sites are represented by point data. The background polygon shows areas where the dissolved oxygen concentration is less than 2.0 milligrams per liter. The data were collected during the summer of 2014 by the Louisiana Universities Marine Consortium (LUMCON).

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EPA Office of Water (OW): TMDLs on Impaired Waters NHDPlus Indexed Dataset

The Total Maximum Daily Load (TMDL) Tracking System contains information on waters that are Not Supporting their designated uses. These waters are listed by the state as impaired under Section 303(d) of the Clean Water Act. The status of TMDLs are also tracked. TMDLs are pollution control measures that reduce the discharge of pollutants into […]

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EPA Office of Water (OW): Waste Water Feature Service

As authorized by the Clean Water Act, the National Pollutant Discharge Elimination System (NPDES) permit program controls water pollution by regulating point sources that discharge pollutants into waters of the United States. Point sources are discrete conveyances such as pipes or man-made ditches. Individual homes that are connected to a municipal system, use a septic […]

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EPA Office of Water (OW): NPDES Permitted Facilities

Spatial layer of the NPDES permitted facilities and their attributes. The layer contains attributes from two materialized views of tables that OECA maintains of NPDES facility information from the ICIS and PCS databases.

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EPA Office of Water (OW): STORET Water Quality Monitoring Stations NHDPlus Indexed Dataset

Storage and Retrieval for Water Quality Data (STORET and the Water Quality Exchange, WQX) defines the methods and the data systems by which EPA compiles monitoring data (typically water quality data, but not exclusively water quality data) that are collected by a number of entities. This dataset represents the monitoring locations contained within the STORET […]

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EPA Office of Water (OW): STORET Water Quality Monitoring Stations Source Dataset

Storage and Retrieval for Water Quality Data (STORET and the Water Quality Exchange, WQX) defines the methods and the data systems by which EPA compiles monitoring data (typically water quality data, but not exclusively water quality data) that are collected by a number of entities. This dataset represents the monitoring locations contained within the STORET […]

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