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Fire agencies worldwide apply millions of gallons of fire suppression chemicals on a broad array of ecosystems. These chemicals are considered to have minimal effects on the health of people who might be exposed to them. Only incidents of skin and eye irritation have been reported as a result of prolonged fire retardant and firefighting foam contact. Fire suppression chemicals have minor toxicological or ecological effects and, as a result, do not generally harm terrestrial ecosystems. Major impacts, suppression chemicals have on the environment, may be through the adverse effects on water quality, and subsequently to aquatic ecosystems. Retardants may encourage eutrophication and, in some cases, contribute to fish kill when applied on watersheds, or if accidentally applied directly to water bodies. Foams are generally more toxic than retardants to aquatic biota, but they are applied in much smaller quantities. Application of retardants increases the total amount of smoke and airborne particulate produced, but air quality implications are minimal since additional smoke emission by the retardant is insignificant compared to the major output by the wildfire. Recommendations are offered for mitigation of potential human health and environmental impacts from the use of fire suppression chemicals, nevertheless, risks must be assessed on a site-by-site basis.

Effects of wildfire suppression chemicals on people and the environment