The study revealed that these mixtures produce trace amounts of cyanide that exceed Environmental Protection Agency guidelines for freshwater organisms. These trace levels can be hazardous for fish and other aquatic organisms but are not at levels hazardous to humans. As a result of the study, the agencies have suspended their use indefinitely. Not all retardant products used are affected. It has been federal policy and practice to avoid dropping retardants in or near water.
Any accidental release needs to be avoided.
The primary reason for the suspension is to avoid releases or accidents that may occur near water. Retardants have been used safely and effectively since the 1970s. Retardants are used to aid firefighters on the ground by slowing the fire's rate of spread, which then allows firefighters more time to construct control lines. Retardant is used primarily on ridges and slopes. Retardant use is restricted in these areas.