State of Montana

1520 E 6th Ave
Helena, MT 59601

The Montana Department of Environmental Quality (DEQ) is dedicated to promoting a healthy environment through effective regulation and oversight of air, water, energy, and waste management in the state. Organized into three divisions—Air, Energy and Mining; Waste Management and Remediation; and Water Quality—DEQ ensures compliance with state and federal laws while supporting community efforts in environmental protection and cleanup initiatives.

In addition to its regulatory functions, DEQ provides technical assistance, financing mechanisms, and educational resources to enhance access to energy efficiency and alternative energy sources. The agency also plays a vital role in overseeing the management of hazardous materials, conducting remedial investigations, and implementing cleanup strategies at contaminated sites across Montana.

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