20250610 18413700 1.0 ISO19115_3 TRUE OverviewThis Feature Service provides tabular data exported from the SDWIS Fed Data Warehouse on all active public water systems across the United States that have been reported to the <a target='_blank' href='https://www.epa.gov/ground-water-and-drinking-water/safe-drinking-water-information-system-sdwis-federal-reporting' rel='nofollow ugc noopener noreferrer'>SDWIS Federal Reporting Services system</a>. Table DescriptionThe single table within the service, "Active Water Systems," contains core water system attributes for all active public water systems (PWS), including PWS ID, name, activity status, type, and primacy agency and the EPA region where the system is located. See the <a target='_blank' href='https://www.epa.gov/DWdata/sdwis-federal-reporting-services-data-dictionary' rel='nofollow ugc noopener noreferrer'>SDWIS Federal Reporting Services Data Dictionary</a> for more detailed information on each field.  Data SourceThese data are obtained from the <a target='_blank' href='https://sdwis.epa.gov/ords/sfdw_pub/r/sfdw/sdwis_fed_reports_public/200' rel='nofollow ugc noopener noreferrer'>SDWIS Federal Reporting Services</a> system. SDWIS contains drinking water data that states are required to submit periodically, such as quarterly, to the EPA under the Safe Drinking Water Act.  Users can visit SDWIS to obtain additional information on both active and inactive systems, such as the number of people served, service area information, characteristics of the system’s water source(s), and violation and enforcement information.Use Cases<ul><li>Users can combine this table of active PWS with other datasets, such as from SDWIS or other sources, to conduct analyses related to resource allocation, public health protection, infrastructure planning, and risk assessments.  </li><li>As of July 2026, this table supports the Opt-In form for the EPA Service Line Inventory GeoSolution, a tool offered by EPA Region 8 to assist public water systems in Wyoming and on Tribal Lands in EPA Region 8 meet requirements under the Lead and Copper Rule Revisions (LCRR). </li></ul>Data Management and UpdatesThe information in the table reflects the latest quarter of SDWIS data available, ensuring reliable and up-to-date resource management.  ActiveWaterSystems 2026-06-24T09:55:27 Drinking WaterService Line InventoriesU.S. EPA Table of active public water systems, as reported in the Safe Drinking Water Information System (SDWIS) Fed Data Warehouse. The data within this table is pulled from the SDWIS Fed Data Warehouse and reflects the latest quarter of SDWIS data available. U.S. Environmental Protection Agency <img src='https://epa.maps.arcgis.com/sharing/rest/content/items/094c946babab45fab42e433dcd2b10d8/data' width='120' height='37' /> This content item is licensed under the US EPA Data Licensing Agreement for public use.<a target='_blank' href='https://edg.epa.gov/EPA_Data_License.html' rel='nofollow ugc noopener noreferrer'>License Summary</a>  |  <a target='_blank' href='https://www.epa.gov/web-policies-and-procedures/epa-disclaimers#geospatial' rel='nofollow ugc noopener noreferrer'>Terms of Use</a><a target='_blank' href='https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7B75533E17-C91F-4D96-82C2-CB5CC977D78F%7D' rel='nofollow ugc noopener noreferrer'>Shared Enterprise Geodata and Services</a> (SEGS) is an EPA-curated collection of recommended geodata assets that are nationally relevant and support the Agency’s mission to protect human health and the environment. By connecting EPA users with curated datasets and promoting service reuse, SEGS aims to enhance information access, reduce data-storage costs, and improve the consistency and quality of data at the US EPA. The Shared Enterprise Geodata and Services (SEGS) team welcomes your feedback. Please submit general comments and questions to the <a href='mailto:SEGServices@epa.gov' target='_blank' rel='nofollow ugc noopener noreferrer'>SEGS Shared Mailbox</a>, which is managed by the EPA Office of Mission Support (OMS). Requests for new datasets and related updates should be logged using the <a target='_blank' href='https://forms.office.com/Pages/ResponsePage.aspx?id=s3iziEhnZ0is-Xaqy-ympylsdLDbOrlNlQ_j86of2c9UMFlHTk5CS0gwNDZPUk9PT0wyTVpMSjBDWCQlQCN0PWcu' rel='nofollow ugc noopener noreferrer'>SEGS Sharepoint Form</a>. Additional information about this program is available in <a target='_blank' href='https://teams.microsoft.com/_#/files/General?groupId=8cb556ff-b4b3-4652-bfc7-b42285928d03&threadId=19%3A3d974b1fbc8940e49354b664e4757c16%40thread.skype&ctx=channel&context=General&rootfolder=%252Fsites%252FSEGS%252FShared%2520Documents%252FGeneral' rel='nofollow ugc noopener noreferrer'>Microsoft Teams</a> and SEGS services explored using the <a target='_blank' href='https://segs-epa.hub.arcgis.com/' rel='nofollow ugc noopener noreferrer'>SEGS Data Discovery Tool</a>. iVBORw0KGgoAAAANSUhEUgAAASwAAADICAYAAABS39xVAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAB 2AAAAdgB+lymcgAAAqpJREFUeJzt1DENADAMwLAd5U+5o7BvimQjyJXZ3T0AAfM7AOCVYQEZhgVk GBaQYVhAhmEBGYYFZBgWkGFYQIZhARmGBWQYFpBhWECGYQEZhgVkGBaQYVhAhmEBGYYFZBgWkGFY QIZhARmGBWQYFpBhWECGYQEZhgVkGBaQYVhAhmEBGYYFZBgWkGFYQIZhARmGBWQYFpBhWECGYQEZ hgVkGBaQYVhAhmEBGYYFZBgWkGFYQIZhARmGBWQYFpBhWECGYQEZhgVkGBaQYVhAhmEBGYYFZBgW kGFYQIZhARmGBWQYFpBhWECGYQEZhgVkGBaQYVhAhmEBGYYFZBgWkGFYQIZhARmGBWQYFpBhWECG YQEZhgVkGBaQYVhAhmEBGYYFZBgWkGFYQIZhARmGBWQYFpBhWECGYQEZhgVkGBaQYVhAhmEBGYYF ZBgWkGFYQIZhARmGBWQYFpBhWECGYQEZhgVkGBaQYVhAhmEBGYYFZBgWkGFYQIZhARmGBWQYFpBh WECGYQEZhgVkGBaQYVhAhmEBGYYFZBgWkGFYQIZhARmGBWQYFpBhWECGYQEZhgVkGBaQYVhAhmEB GYYFZBgWkGFYQIZhARmGBWQYFpBhWECGYQEZhgVkGBaQYVhAhmEBGYYFZBgWkGFYQIZhARmGBWQY FpBhWECGYQEZhgVkGBaQYVhAhmEBGYYFZBgWkGFYQIZhARmGBWQYFpBhWECGYQEZhgVkGBaQYVhA hmEBGYYFZBgWkGFYQIZhARmGBWQYFpBhWECGYQEZhgVkGBaQYVhAhmEBGYYFZBgWkGFYQIZhARmG BWQYFpBhWECGYQEZhgVkGBaQYVhAhmEBGYYFZBgWkGFYQIZhARmGBWQYFpBhWECGYQEZhgVkGBaQ YVhAhmEBGYYFnIoLreIHHblfYqUAAAAASUVORK5CYII= 2026-06-24 U.S. Environmental Protection Agency