Alaska: Alaska’s Water Quality Map provides information on impaired surface waters to the public. The map includes links to reports of available monitoring data and results for each site, as well as TMDLs (where applicable).

Arkansas: AquaView represents as point features water quality monitoring stations across the state, and includes a link to water chemistry data for each.

Colorado: The Colorado Segmentation 2018 & 2020 map shows assessment results and IR category for streams and lakes across the state.

Delaware: The Delaware Water Quality Portal map provides current and historical water quality data for monitoring stations across the state.

Idaho: The 2016 IR is available as an interactive map. The map includes a navigation panel and a table with results.

Illinois: The interactive Resource Management Mapping Service includes a variety of environmental information, including on TMDLs, protection, NPS implementation, and other topics, as well as information from other state agencies including IDOT and IDNR. Static maps showing assessment results for the state and for the Chicago area are also available.

Iowa: DNR maintains an interactive impaired waters map. This work was completed in-house by DNR’s database manager with some help from IT and GIS personnel.

Kentucky: The Kentucky Water Health Portal contains assessment and use attainment information for waters throughout the state, highlighting TMDL waters and Outstanding State Resource Waters. Users can browse the map or use a search function, and can open a linked assessment summary report that includes a plain language explanation of the listing, information about the data sources and data age, and a link to the TMDL report or other report where applicable.

Indiana: After hearing that the general public is largely unaware of Indiana’s Reach Indexing system, and therefore unable to translate a list of impaired waters to specific geographic locations of those waters, Indiana compiled an ArcGIS Online-based application to convey the locations and status of impaired waters in the state. This application includes the assessment unit identifier (AUID) for each reach of stream in the state, the 303(d) category (1-5) of that AUID, and links to TMDLs and watershed management plans (WMPs), when applicable. Users zoom in to the stream of interest using an interactive map or search for the stream name using a search tool; a tutorial is included. It is believed that regulated entities also use this tool for information. It seems that there was not an insignificant effort required to initially set this up. Ongoing cost is believed to be relatively minimal. One FTE maintains and updates the information each cycle.

Maryland: The Water Quality Assessments (IRs) and TMDLs interactive map displays information from the 2018 IR. In addition to providing assessment and TMDL information, the map highlights the spatial relationship among various elements. The map contains layers for specific pollutants.

Massachusetts: The 2014 Integrated List of Waters Viewer conveys the 2014 IR in an interactive map form and shows IR category for each water (when selected).

Minnesota: The Impaired Waters Viewer displays the impaired waters included in the state’s draft 2020 Impaired Waters List.

Nebraska: Assessment results from the 2018 IR are also available as Google Earth KMZ files.       

Nevada: BWQP built in-house a web map that allows the public to view assessment results on an easy-to-use platform. The map provides information on recent and historic CWA 303(d)/305(b) assessments, station information, and other metadata including associated regulations on a particular waterbody. BWQP won an award from ESRI for using ArcGIS and GeoCortex tools to produce a web map for disseminating CWA 303(d)/305(b) data to the public.

New Mexico: The EGIS Mapper Application allows users to view a variety of environmental data, including assessment results, water quality stations, NPDES permits, ONRWs, and other, non-water-related information, in interactive map form.

North Carolina: The 2018 IR is available in interactive map form.

North Dakota: The Surface Water Quality Data For North Dakota tool allows users to see IR category of the state’s waters and to search by waterbody name and other criteria.         

Ohio: The Water Quality: Assessment Unit Summaries map allows users to view assessment unit summaries and categories from the 2018 IR. The map contains a narrative tutorial and links to maps for previous years.

Oregon: DEQ shared its 2018/2020 Integrated Report for public comment by making the information viewable in three different ways, one of which was an interactive web map displaying the IR by overall status of an assessment user. The map allows the user to click on specific waterbodies and get assessment results and applicable WQ criteria. The GIS-based web map took at least three years to develop and required digitizing current PDF maps and interpolating water quality criteria. The app costs the agency $299/month.

Pennsylvania: The 2018 Integrated Report is also supported by a map interface application where the data can be downloaded directly. Both tools work in tandem to provided information to a larger audience than any one application could do alone.

Penobscot Indian Nation: The Environmental Data Viewer contains information about monitoring activities and standards violations in Penobscot waterways.

Red Lake Nation: Impaired streams and lakes within the Red Lake Watershed are shown in a static map.

South Carolina: The SC Watershed Atlas provides information about permits, monitoring, and assessment activities in watersheds throughout the state.

South Dakota: DENR’s Water Quality Monitoring Access Portal allows users to graph, review, and download water quality data for waterbodies throughout the state. It allows the public quick access to a waterbody and outlines the beneficial uses, water quality standards, IR status, and recent and historical water quality data for each. It is primarily used as an educational tool. The cost to build the first version of the portal was approximately $25K; the project started as a continuing education project from a staff member enrolled in a graduate-level class. It was not too difficult to convince management, as the funds were available through an EPA Exchange Network Grant. The nuts and bolts of the portal were completed by the SD State Bureau of Information and Technology.       

Tennessee: The Division of Water Resources Public Data Viewer contains information on permits, monitoring sites, and other watershed information for waters throughout the state.

Texas: The Surface Water Quality Viewer allows users to view impairment status for stream segments and waterbodies throughout the state. The map also includes monitoring stations.

Vermont: Interactive maps made by DEC include a side-by-side map of the lowest two miles of the Clarendon River shows the magnitude of stress from agriculture and developed lands and the Upper Connecticut Assessment Map, which shows the dates and results of assessments in the Upper Connecticut River Watershed.

Virginia: DEQ maintains an interactive web map that provides information about the IR category of waterbodies throughout the state.

Washington: Department of Ecology promotes a public database application called the Water Quality Atlas. The web-based application provides multiple data layers for analysis and communication, including a layer for the current approved assessment as well as boundaries for TMDLs that have been approved or are in development.