amarcozzi·vor 5 Monaten·discussGood question and unfortunately I don't know the answer to that. I haven't heard of it being an issue, but it doesn't mean that it's not a problem by us. I tend to see more concerns raised with the impact of retardent drops on watersheds.
amarcozzi·vor 5 Monaten·discussFormer wildland firefighter (used to work on a hotshot crew) turned wildfire researcher here. Feel free to reach out with questions.