Service Description: This dataset contains US public water system service areas for over 44,000 community water systems and approximately 80,000 transient and non-transient non-community water systems
Service ItemId: 80c6912ef14f46e480f5afd807767b4b
Has Versioned Data: false
Max Record Count: 2000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
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Description: Community water system service areas describe the geographic area that receives drinking water from a given community water system. Knowing these boundaries help to connect water system data (such as, compliance status) with water system customers.
This dataset contains ~44,000 unique service areas across all 50 states. While not 100% comprehensive, these systems cover 99% of all public water system consumers. 56% of systems are sourced from state/utility databases. The remaining systems, those with no state supplied boundary, were modeled using machine learning techniques. This effort used state sourced service areas to train a model on dozens of explanatory variables including drinking water intakes in order to approximate service areas where none are publicly available.
This dataset used the 2025 Quarter 2 Safe Drinking Water Information System for establishing the universe of community water systems.
The system sourced boundaries are derived from approx. 1000 unique sources. Download the ‘Data Sources.xlsx’ spreadsheet to view these sources: https://epa.maps.arcgis.com/home/item.html?id=ed844af1c459429aa4a7c81299e6f41a.
***Version 1.3 was updated on 04/16/25. This update replaced Minnesota's modeled boundaries with authoritative boundaries derived from MN's lead service line inventory***
***Version 2.0 was updated on 09/19/25. This update substancially increased the number system sourced service areas. Many of these came from lead service line inventories and utility water main data, for example. With this update, 85% of the population on public water is represented by system sourced service areas.***
***Version 2.01 was updated on 09/29/25. There were minor edits to about 24 systems with duplicate PWSIDs***
***Version 2.1 was updated on 11/18/2025. 996 system sourced service areas were added. In particular, many system sourced utility boundaries were added for Alaska, Colorado, Florida, Mississippi, and Montana.***
***Version 3.0 was updated on 3/17/2026. This update showcases the release of transient and non-transient non-community water system service areas.***
Copyright Text: US EPA
Spatial Reference: 4326 (4326)
Initial Extent:
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YMin: 36.2624881800254
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Spatial Reference: 4326 (4326)
Full Extent:
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Spatial Reference: 4326 (4326)
Units: esriDecimalDegrees
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