Missoula County maintains a listing of businesses that handle and store potentially hazardous chemicals. This inventory is kept in accordance with Environmental Planning and Community Right-To-Know Act (EPCRA), commonly known as SARA Title III, Tier II. Tier II reporting applies to any facility at which a hazardous chemical, as defined by the Occupational Safety and Health Act, is present in an amount exceeding a specified threshold.  Federal regulations have established reporting requirements of hazardous chemicals to enhance community awareness of chemical hazards and to help develop state and community emergency response plans. The Missoula LEPC asks facilities to voluntarily report chemical storage below federal reporting requirements.

Facilities within Missoula County that handle or store hazardous materials should to use E-Plan as their primary Tier 2 reporting methodology.