Laws and Regulations

Administrative Rules of Montana

DEQ is responsible for administering and enforcing several chapters of rules within Title 17 of the Administrative Rules of Montana (ARM). The links below to the specific chapters on the Montana Secretary of State website are provided as a convenience for interested parties. Administrative rules are periodically reviewed and revised by DEQ and some lapse in time may occur between adoption and the electronic posting of new or revised rules. Electronic rules on the Secretary of State website are updated quarterly and may not reflect the most current version adopted. For an official version of the Administrative Rules of Montana, please contact the Secretary of State at (406) 444-2055.

Table of Contents (Title 17)

Chapter 1 - Organization of Department
Chapter 4 - Procedural Rules
Chapter 8 - Air Quality
Chapter 20 - Major Facility Siting
Chapter 24 - Reclamation
- Hard Rock Mining - Subchapter 1
- Opencut Mining - Subchapter 2
- Coal Mining - Subchapters 3-18
Chapter 30 - Water Quality
Chapter 35 - Vessel Pumpout Facilities
Chapter 36 - Subdivisions/On-Site Subsurface Waste Water Treatment
Chapter 38 - Public Water and Sewage System Requirements
Chapter 40 - Water Treatment Plants and Operators
Chapter 50 - Solid Waste Management
Chapter 53 - Hazardous Waste
Chapter 54 - Hazardous Waste Management (repealed)
Chapter 55 - CECRA Remediation
Chapter 56 - Underground Storage Tanks / Petroleum & Chemical Substances
Chapter 57 - Aboveground Storage Tanks
Chapter 58 - Montana Petroleum Tank Release Compensation Board
Chapter 74 - Occupational Health (Asbestos)
Chapter 80 - Tax Certification - Pollution Control Equipment and Energy Facilities
Chapter 84 - Renewable Energy Credit and Loan Program
Chapter 85 - Alternative Energy Revolving Loan Program
Chapter 86 - Wind Generation Facility Decommissioning and Bonding
MCA-ARM - MCA to ARM Cross Reference

Montana Code Annotated

The laws in the Montana Code Annotated are passed by the Montana State Legislature, which consists of the Montana House of Representatives and the Montana Senate. DEQ is charged with protecting a clean and healthy environment as guaranteed to our citizens by our State Constitution in Titles 75, 76, and 82, Montana Code Annotated.

Statutes

Final Rule Adoption and Amendment Notices

In the table below you will find information on DEQ rulemaking for the past two years. Each archived rule notice includes a link to official public notices on the Montana Secretary of State's website. If you are looking for older information, please contact Loryn Johnson 406-444-1388.

Latest DEQ adopted ARMS
Effective Date	Purpose & Link to Online Rule Notices
September 21, 2024	MAR 17-446 - Notice of Amendment and Repeal (Underground Storage Tanks - amendment of ARM 17.56.101, 17.56.306, 17.56.1303, 17.56.1304, 17.56.1402, 17.56.1403, 17.56.1404, 17.56.1406, and 17.56.1407 and the repeal of ARM 17.56.1308, 17.56.1309, and 17.56.1409). Issue 18 at page 2201 of the 2024 MAR.
September 21, 2024	MAR 17-444 - Notice of Amendment (Subdivision - amendment of ARM 17.36.126 adoption of a new version of Department Circular DEQ-8). Issue 18 at page 2191 of the 2024 MAR.
September 7, 2024	MAR 17-442 - Notice of Adoption and Amendment (Public Water Supply - adoption of NEW RULE I and the amendment of ARM 17.36.126, 17.38.101, 17.38.234 and the amendment to Circular DEQ-1). Issue 17 at page 2144 of the 2024 MAR.
August 24, 2024	MAR 17-447 - Notice of Amendment (Water Quality - amendment of ARM 17.36.103). Issue 14 at page 2057 of the 2024 MAR.
August 24, 2024	MAR 17-445 - Notice of Amendment (Air Quality - amendment of ARM 17.8.102, 17.8.103, 17.8.202, 17.8.301, 17.8.302, 17.8.342, 17.8.604, 17.8 740, 17.8.744, 17.8.802, 17.8.902, 17.8.1002, 17.8.1107, 17.8.1202, 17.8.1313, 17.8.1402, and 17.8.1815). Issue 16 at page 2056 of the 2024 MAR.
July 27, 2024	MAR 17-443 - Notice of Amendment and Repeal (Major Facility Siting Act - amendment 17.20.1304, 17.20.1505, 17.20.1604, 17.20.1606, 17.20.1607, and the repeal of 17.20.818, 17.20.907, 17.20.920, 17.20.921, 17.20.922, 17.20.923, 17.20.924, 17.20.928, and 17.20.929). Issue 14 at page 1879 of the 2024 MAR.
July 27, 2024	MAR 17-441 - Notice of Amendment (Motor Vehicle Recycling and Disposal - amendment of ARM 17.50.213) Issue 14 at page 1878 of the 2024 MAR.
June 6, 2024	MAR 17-439 - Notice of Amendment (Water Quality amendment of ARM 17.30.508, 17.30.517, 17.30.702, 17.30.715, 17.30.716, and 17.30.718). Issue 13 at page 1581 of the 2024 MAR.
May 11, 2024	MAR 17-438 - Notice of Amendment (State Superfund, Petroleum Tank Cleanup and Solid Waste - amendment of ARM 17.50.1612, 17.50.1617, 17.50.1618, 17.55.109, 17.56.507, and 17.56.608). Issue 9 at page 1062 of the 2024 MAR.
May 11, 2024	MAR 17-437 - Notice of Adoption, Amendment, and Repeal (Mining Bureau - NEW RULE I, the amendment of ARM 17.24.102, 17.24.107, 17.24.116, 17.24.118, 17.24.128, 17.24.132, 17.24.141, 17.24.144, 17.24.145, 17.24.146, 17.24.150, 17.24.159, 17.24.166, and 17.24.171, and the repeal of ARM 17.24.165 and 17.24.170). Issue 9 at page 1060 of the 2024 MAR.
April 13, 2024	MAR 17-436 - Notice of Amendment and Repeal (Asbestos - amendment to ARM 17.74.350, 17.74.351, 17.74.352, 17.74.353, 17.74.354, 17.74.355, 17.74.356, 17.74.357, 17.74.358, 17.74.359, 17.74.360, 17.74.362, 17.74.363, 17.74.364, 17.74.365, 17.74.366, 17.74.367, 17.74.368, 17.74.369, and 17.74.409, and repeal of ARM 17.74.343, 17.74.370, 17.74.371, and 17.74.372). Issue 7 at page 723 of the 2024 MAR.
March 9, 2024	MAR 17-435 - Notice of Repeal (State Superfund - ARM 17.55.110). Issue 5 at page 471 of the 2024 MAR.
February 24, 2024	MAR 17-440 - Notice of Amendment and Repeal (Petroleum Tank Release Compensation Board - ARM 17.58.336 and 17.58.344 and the repeal of ARM 17.57.101, 17.57.102, 17.57.103, 17.57.104, 17.57.105, 17.57.106, and 17.57.107). Issue 4 at page 329 of the 2024 MAR. Petro Board
February 10, 2024	MAR 17-433 - Notice of Adoption and Amendment (Water Protection - NEW RULE I and NEW RULE II and the amendment of ARM 17.30.1001, 17.30.1005, 17.30.1010, 17.30.1022, 17.30.1023, 17.30.1024, 17.30.1033, 17.30.1040, and 17.30.1041). Issue 3 at page 262 of the 2024 MAR.
February 10, 2024	MAR 17-432 - Notice of Amendment and Repeal (MAR 17-432A, MAR 17-432B, MAR 17-432C, MAR 17-432D, and MAR 17-432E) Issue 3 at pages 253 through 261 of the 2024 MAR. MAR 17-432C hearing transcript
December 23, 2023	MAR 17-431 - Notice of Amendment (Air Quality - ARM 17.8.202). Issue 24 at page 1863 of the 2023 MAR.
December 23, 2023	MAR 17-430 - Notice of Adoption and Amendment (Subdivision - NEW RULE I and NEW RULE II and the amendment of ARM 17.36.101, 17.36.112, 17.36.123, 17.36.310, 17.36.321, 17.36.323, 17.36.605, 17.36.610, 17.36.802, 17.36.914, 17.36.918, 17.38.101, and 17.38.102, and amendments to Circular DEQ-4 and Circular DEQ-20). Issue 24 at page 1861 of the 2023 MAR.
August 5, 2023	MAR 17-429 - Notice of Amendment and Repeal of ARMs and Circular (Major Facility Sitting Act [MFSA] - ARMS 17.20.202, 17.20.203, 17.20.204, 17.20.205, 17.20.206, 17.20.301, 17.20.303, 17.20.605, 17.20.802, 17.20.803, 17.20.806, 17.20.807, 17.20.901, 17.20.1301, 17.20.1302, 17.20.1418, 17.20.1426, 17.20.1501, 17.20.1502, 17.20.1503, 17.20.1509, 17.20.1510, 17.20.1511, 17.20.1605, 17.20.1801, and 17.20.1902 and circular MFSA-2, Repealing 17.4.501, 17.4.502) Issue 15 at page 764 of the 2023 MAR.
April 15, 2023	MAR 17-421 - Notice of Amendment, Repeal, Transfer, and Adoption of ARMS and Circulars (Subdivision - ARMS NEW RULE I, the amendments and transferring of ARM 17.36.309, 17.36.312, 17.36.313, 17.36.314, 17.36.326, 17.36.328, 17.36.345, the amendments of ARM 17.36.101, 17.36.102, 17.36.103, 17.36.104. 17.36.106, 17.36.108, 17.36.112, 17.36.116, 17.36.310, 17.36.320, 17.36.322, 17.36.323, 17.36.327, the repealing of ARM 17.36.330, 17.36.331, 17.36.332, 17.36.333, 17.36.334, 17.36.335, 17.36.336, And Circular DEQ-20, amendments to Circular DEQ-3 and Circular DEQ-4, and the repealing of DEQ-11 and Circular DEQ-17) Issue 7 at page 324 of the 2023 MAR.
October 8, 2022	MAR 17-426 - Notice of Adoption (Water Quality - Variance NEW RULE I) Issue 19 at page 2009 of the 2022 MAR.
October 8, 2022	MAR 17-425 - Notice of Amendment and Adoption (Opencut Mining ARMS 17.24.201, 17.24.202, 17.24.212, 17.24.213, 17.24.214, 17.24.218, 17.24.219, 17.24.220, 17.24.221, 17.24.222, 17.24.226 & NEW RULES I, II, and II) Issue 19 at page 2009 of the 2022 MAR.
September 24, 2022	MAR 17-423 - Notice of Amendment (Hard Rock Mining ARMS 17.24.101, 17.24.102, 17.24.103, 17.24.105, 17.24.106, 17.24.107, 17.24.117, 17.24.119, 17.24.120, 17.24.121, 17.24.128, 17.24.153, 17.24.157, and 17.24.181) Issue 18 at page 1830 of the 2022 MAR.
September 24, 2022	MAR 17-417 - Notice of Amendment and Adoption (Methamphetamine Control and Cleanup ARMS 17.74.501, 17.74.504, 17.74.505, 17.74.506, 17.74.507, 17.74.508, 17.74.511, 17.74.512, 17.74.513, 17.74.514, 17.74.515, 17.74.516, 17.74.517, 17.74.518, & NEW RULE I, NEW RULE II, and NEW RULE III) Issue 18 at page 1812 of the 2022 MAR.
August 27, 2022	MAR 17-422 - Notice of Amendment and Circulars (PWS ARMS 17.36.345, 17.38.101, 17.38.209 & DEQ-1 Circular, and PWS-5) Issue 16 at page 1695 of the 2022 MAR.

Table of Contents (Title 17)

Statutes

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Notices