EGLE’s updated Water Withdrawal Assessment Tool launching this fall

Michigan Department of Environment, Great Lakes, and Energy sent this bulletin at 08/25/2025 12:00 PM EDT

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EGLE’s updated Water Withdrawal Assessment Tool launching this fall

The Michigan Department of Environment, Great Lakes, and Energy (EGLE) is excited to announce upcoming enhancements to the Water Withdrawal Assessment Tool (WWAT), an online resource that helps evaluate the impact of proposed large quantity water withdrawals and streamlines the registration process.

The updated WWAT will roll out in two phases:

Phase 1 – September 22, 2025: Applicants will be able to assess proposed withdrawals using an unconfined aquifer system.
Phase 2 – Early 2026: Additional functionality will allow users to assess withdrawals using semi-confined and two-layer aquifer systems.

These updates are designed to improve the user experience and introduce new capabilities, including the option to select the most appropriate aquifer type for the site. The tool also supports more accurate depletion estimates by allowing users to submit site-specific parameters, this first release will include the ability to use site-specific Transmissivity and Storativity.

To access the updated WWAT, users must have a MiLogin account—the State of Michigan’s secure login platform.

Support materials and user guidance will be made available ahead of each phase to help users navigate the updated system.

🔔 Stay Informed:

To receive updates on this project and other water use program initiatives in Michigan, subscribe to the email list (please feel free to share this link with anyone who might be interested!).

📅 Upcoming Webinar:

EGLE will host a webinar on September 22, 2025, at 10 a.m. to introduce the updated tool and answer questions. Register for that webinar today!

🔗 For more information:

Check out EGLE's Water Use Program webpage and Water Withdrawal Assessment Tool webpage for more information.
To learn more about MiLogin, check out the MiLogin help page and FAQs.

People with disabilities may request this material in an alternate format by emailing EGLE-Accessibility@Michigan.gov or calling 800-662-9278.

EGLE does not discriminate on the basis of race, sex, religion, age, national origin, color, marital status, disability, political beliefs, height, weight, genetic information, or sexual orientation in the administration of any of its programs or activities, and prohibits intimidation and retaliation, as required by applicable laws and regulations.

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