Boulder Drones: Wildfire Fight or Water Threat?

Boulder County's proposal to deploy drones for applying the herbicide Rejuvra to combat cheatgrass and prevent wildfires is met with significant community concern. Officials cite the rugged terrain of areas like Red Hill as necessitating drone use, as conventional equipment cannot access it. The chosen herbicide, indaziflam, is described by county officials as having limited mammalian toxicity.

However, independent reviews and studies raise alarms. Boulder's own analysis indicates indaziflam is highly toxic to aquatic life and has shown genotoxic effects in lab settings. Furthermore, a 2023 study noted its persistence in soil and potential migration into water sources via a breakdown product. Concerns also exist that the herbicide could harm native seed banks, hindering post-fire recovery.

Questions have been raised regarding potential conflicts of interest due to relationships between county staff and the herbicide's marketers. Despite these concerns and opposition from over 800 residents, a district court previously ruled in favor of the county. However, a new legal challenge under the Endangered Species Act is forthcoming, indicating the dispute is far from over.

Before any drone application, the county is urged to conduct independent chemical testing, establish baseline water and seed bank monitoring, and ensure transparent conflict-of-interest disclosures. Community members express strong opposition, with at least one county commissioner publicly disagreeing with the decision.