Most participants in a river clean-up (multiple locations)

Most participants in a river clean-up (multiple locations)
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Who
Tru Earth , Milwaukee Riverkeeper
What
2,082 total number
Where
United States (Milwaukee)
When
25 April 2026

The most participants in a river clean-up (multiple locations) is 2,082, and was achieved by Milwaukee Riverkeeper (USA) & Tru Earth (Canada) on Milwaukee River, Wisconsin, USA on 25 April 2026.

This record was attempted during the 31st Annual Milwaukee Riverkeeper Spring Cleanup.