Colorado Temporarily Lifts Propane Products From NOx Emissions Limits

Editor’s Note: A version of this press release was originally published through NPGA Bobtail.

On January 1, 2026, Colorado’s new, ultra-low NOx emissions standards for covered gas-fired furnaces and water heaters went into effect. Since then, Colorado retailers have been unable to sell, lease or distribute non-compliant equipment in the marketplace. The authorizing legislation, which passed in 2023, required state officials to utilize an emissions test that was developed for natural gas products, not propane. 

This led to numerous propane products being removed from the state market due to compliance issues. However, following months of advocacy work by the Colorado Propane Gas Association (CPGA), the legislature recently passed a bill that exempts “products fueled by propane” from the state’s new NOx emissions limits until January 1, 2031. 

This ensures Colorado consumers have continued access to all propane-powered furnaces and water heaters. Tom Clark, executive director of CPGA, has been advocating for lawmakers to take remedial action on this issue since the legislature reconvened for business in mid-January. 

“We knew this was going to be a heavy lift, given the political climate in Colorado,” said Clark. “We engaged legislators and regulators to make sure they understood the real world impacts this rule would have on propane customers, rural communities, and the businesses that serve them. Getting this amendment passed was a major win for consumer choice and energy affordability in Colorado. We appreciate the legislators who worked with us on a practical solution, and are especially grateful to NPGA for their assistance in supporting this important advocacy effort.” 

As of the 2024 industry sales report, Colorado is the 18th largest propane market in the country, with 186 million gallons sold. Further, 5% of Colorado households rely on propane for primary space heating, and 3% use it for water heating.