Oil & gas compliance and recordkeeping

New disproportionately impacted community definition in effect as of May 2023


In May 2023, Colorado adopted a new definition of disproportionately impacted communities with House Bill 23-1233. Colorado now has a single definition of disproportionately impacted communities that applies to all Colorado state agencies.


After it was signed into law, the Air Pollution Control Division began applying the new 2023 definition in its work. This includes applying the new definition to the division’s work relating to oil and gas operations. 


The latest version of Colorado EnviroScreen currently provides data based on this new definition. Please continue using the latest version of the disproportionately impacted community definition displayed on Colorado EnviroScreen to identify disproportionately impacted communities moving forward. 


You can also directly download Geographic Information System (GIS) files (shapefiles) with the current definition of disproportionately impacted communities from CDPHE Open Data.


Questions? Please contact cdphe_ej@state.co.us.

Oil & Gas


Storage tank and vapor control system guidelines

Guidelines for design, operation, and maintenance of vapor control systems at oil and gas facilities.

Oil & gas operating and maintenance plans

Forms and guidance for O&M plans for equipment at oil & gas facilities.

Midstream GHG Reductions

Each oil and gas midstream segment owner or operator must participate in this program to develop a plan to reduce GHG emissions from midstream fuel combustion equipment.  (Reg. 7, Part B, Section VII).  Rulemaking in late 2024.

Regulation No. 7


Approved Instrument Monitoring Method (AIMM)
Part B, Section I.F.3: Storage Tank Control Strategy 
Part B, Section I.H.6: Glycol dehydrators
Part B, Section II.: Control Equipment
Part B, Section II.B.2.h: ECD Performance Testing
Part B, Section II.C: Storage Tank Emissions Management (STEM)
Part B, Section II.E.4.f.: Alternative inspection frequency
Part B, Section II.G: Well Liquid Unloading, Downhole Well Maintenance, and Well Plugging Activities
Part BSection IV: Natural Gas Transmission and Storage Segment
Part BSection V: Oil and Natural Gas Annual Emissions Inventory Reporting
Part B, Section VI: Oil and Natural Gas Pre-Production and Early Production Operations
Part B, Section VII:  GHGs from Midstream Fuel Combustion Equipment
Part B, Section VIII: Greenhouse Gas Intensity Program for Oil and Natural Gas Upstream Segment
Part B, Section III.C.4 - Pneumatics Reporting

Regulation No. 26


Regulation No. 26, Part B, Section I.D.5.b - Large Engines
Regulation 26, Part B, Section I.D.6 -  Medium Engines

"Medium" Engines are: Rich Burn Natural Gas Fired engines 100hp < 1000 hp, Lean Burn Natural Gas Fired engines 250hp < 1000 hp, Diesel or dual fuel engines >500 hp

Leak Detection and Repair (LDAR)



  • PS Memo 14-04 LDAR and open-ended valves and line requirements.
  • March 2021 LDAR Training slides.

LDAR Annual Reports


Visible Emissions Observations



Regulatory Updates Guidance


2021 Revisions to Regulation No. 7 and Regulation No. 22


2020 Revisions to Regulation No. 7


2017 Revisions to Regulation No. 7


2014 Changes to Regulation Nos. 3, 6, and 7


Optical Gas Imaging Infrared (IR) Camera Inspection Program

IR camera inspection pilot project assessment (July 2016)
Two-year project using optical gas imaging infrared cameras to identify and address sources of emission leaks and venting. 

IR camera inspection program updated assessment (March 2019)


Noble Energy consent decree

Settlement between Noble Energy, the Colorado Department of Public Health and Environment and the U.S. Environmental Protection Agency, effective June 2, 2015.

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