Fish kill on Garvin Brook investigation and response

A fish being measured on a board.After a citizen reported a fish kill on Garvin Brook in Winona County on Sept. 26, 2019, three state agencies responded by surveying the extent of the kill, taking water samples, walking the stream and tributaries, and talking with landowners. The investigation team met several times to discuss the lab analysis of water samples and other information. The agencies were not able to determine the exact cause of the kill because of the time lapse between the kill occurring and being reported. However, the agencies agreed that the fish kill likely occurred because of heavy rains leading to contaminated runoff that caused short-term toxic conditions for fish.

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