The University of Wisconsin - Oshkosh is offering Door County the Well Testing Program again in Spring 2026. Registration for the program runs through April 3, 2026. Water Sample dropoffs are scheduled for April 17, 2026 and April 18, 2026 at the Jacksonport Town Hall. Click Here to view the Well Testing Flyer for Registration Information. Dates, Times and Locations for Water Sample Dropoffs can be found on the Website Home Page under What's Happening on Clark Lake.