Cleanups range in size from five or ten volunteers to thousands.
One thousand volunteers have targeted 175 miles of Wisconsin waterways to clean during National River Cleanup Week. The state of Wisconsin has registered the largest number of cleanup groups at thirty. Pennsylvania and California follow the lead with twenty-eight and twenty cleanups, respectively. From the inception of National River Cleanup Week in 1992, diverse groups have come together each year to cleanup and focus attention on their local waterways. Government agencies, paddle sports enthusiasts, outfitters, businesses, civic and conservation groups take part in the event.