graphics of GIS maps

GIS Maps and Data

The Milwaukee Metropolitan Sewerage District GIS group provides geospatial leadership, expertise, communication, and coordination to support the core business processes of the District. The GIS group administers the distribution of current, accurate, high-quality geospatial data and a platform of integrated GIS maps and tools to support the District’s Strategic Mission to protect public health and environment through world-class, cost-effective water resource management, leadership, and partnerships.


MMSD is a participating member of Wisconsin’s One-Call Center, Diggers Hotline, and operates as a receiving station for tickets responding to planned as well as unanticipated excavation activities. The District is responsible for assessing the information in the tickets and taking action to protect District facilities, human life and the environment.

View MMSD Facilities Map Legend for Diggers Hotline.


MMSD Open Data Portal

The purpose of the MMSD Open Data Portal is to provide the public with access to the geographic data available through the Milwaukee Metropolitan Sewerage District. Users may use this site to access and/or download geographic data and the associated metadata. Users who wish to access or download data agree to understand and abide by the terms and conditions of the MMSD data disclaimer.

If you are looking for municipal sewer data, please contact the municipality directly. Learn the differences between MMSD Metropolitan Interceptor Sewers and municipal sewers on our sewer page.


Please contact us with further questions, comments, or requests for MMSD GIS data or related geospatial information.

For all other requests, please refer to Records Request.

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