The compost recycler serving Boulder said it will only accept food scraps, plants and certain compostable bags starting April 1. Credit: John Herrick

The company that recycles compost for Boulder’s residents and businesses announced this week it will no longer accept many biodegradable products — including paper materials, tea bags, coffee filters, disposable cutlery and other items labeled as “compostable” — as part of its latest effort to crack down on contamination. 

A1 Organics, which operates one of the largest commercial composting facilities in the Front Range, said it will only accept food scraps, yard waste, plant trimmings and certain compostable bags. The change will take effect on April 1, 2023. 

The announcement is a major change to the city’s 14-year-old curbside composting program, one of the few such urban efforts in the county. It means that compostable products that many consider to be eco-friendly alternatives to traditional plastics, such as to-go cups for iced coffee, will soon be heading directly to the landfill, where the company said many of these products end up already. 

Typically made from plant fibers or starches, certain compostable products do not break down at A1’s facility in Keenesburg, about an hour’s drive east of Boulder. Meanwhile, non-compostable “look-alike items” are also ending up in the mix, according to the company. 

As a result, entire batches of compost have been “contaminated with fragments” of trash, it said. Unable to sell the compost, A1 Organics dumps it in the landfill and bills Boulder’s primary waste hauler, Western Disposal, for disposal fees. 

“Our goal is to keep food scraps and yard trimmings out of the landfill,” the company said in a news release announcing the new guidelines. 

When food waste rots in a landfill, it emits methane gas, a major contributor to climate change. Composting, by contrast, turns food scraps into soil fertilizer. (Waste sent to the landfill accounts for about 2% of the city’s total greenhouse gas emissions.) 

A1 said the changes would cut landfill methane emissions, while helping  “Colorado farms and landscapes build healthy soils that absorb carbon dioxide from the atmosphere, reduce water and chemical use, and grow nutritious foods.” 

Many compostable items carry a logo from the Biodegradable Products Institute, an organization that certifies whether products are compostable. The BPI certification indicates, in part, if a product meets international standards for being able to break down in “municipal and industrial composting facilities.” 

Come April, the company said it will only accept three-gallon compostable bags certified as “composter approved” by the Compost Manufacturing Alliance, a company that performs field testing to determine how products break down in certain conditions. Bags certified only by BPI, and not CMA, will no longer be accepted.

In July 2022, Western Disposal Services, a Boulder-based company that provides trash, recycling and compost collection services, warned residents and businesses that contamination was threatening the the viability of composting in the region. The waste hauler is now notifying customers of the recent changes. 

“Compost does need to be clean,” Kathy Carroll, a spokeswoman for Western Disposal Services, told Boulder Reporting Lab. “This is one way to clean the stream. And we need to work with it because they are the only company in the area that can process compost at this time.” 

The changes could come as a shock to Boulder’s businesses, some of which have already invested in single-use compostable serviceware and signage, in part to comply with the city’s 2015 waste diversion ordinance. Last summer, due to reports of contamination from businesses, the city allowed restaurants and cafes to remove their composting receptacles. 

In 2006, in an effort to become a “zero waste” community, the Boulder City Council adopted the goal to divert 85% of its waste — yard debris, food, recyclables — from the landfill by 2017, in part, by recycling or composting. (The target date was later bumped to 2025.) The plan helped spur the city’s curbside compost collection program, which began in 2009. 

The city is about half way toward meeting its zero-waste goal. In 2021, about 44% of the city’s food and other waste was diverted, according to city data

Carroll, of Western Disposal, said it’s unfortunate that many compostable products will soon be disposed of in the landfill. But at least the new guidelines are simple, she said. 

“Plants, food scraps and yard trimmings. That’s it,” Carroll said. “Single-use equals trash now.”

Clarifications: A previous version of this story said BPI-certified bags will no longer be accepted. They will be accepted if they are certified by both BPI and CMA. These bags cannot be more than three gallons. The story also said the city’s zero waste target was set for 2027. The date is 2025. Further, Western Disposal is the primary waste hauler in Boulder, but not the only one. The story has been changed to make that clear.

John Herrick is senior reporter for Boulder Reporting Lab, covering housing, transportation, policing and local government. He previously covered the state Capitol for The Colorado Independent and environmental policy for He is interested in stories about people, power and fairness. Email:

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  1. So no more using old paper sacks or newspaper origami boxes to contain food waste? results in more water usuage to keep the can clean and smells down… bummer. Can fireplace wood ashes be included in this compostable waste stream? So difficult – will definitely discourage usuage by many… I still vermipost as much as possible.

  2. NO PLA compostable containers from take away containers – so the leftovers of your restaurant meal or the take home dinner/ hot coffee on the way to work … NOT an easy compostable – but maybe recycable ? Help the Boulder community understand what they can do better, especially before Farmer’s Market starts up!!!! Thank you to BRL
    check out:

  3. According to Western Disposal, A1 Organics will NOT accept the large compostable 30 gallon paper bags that everyone has historically used to collect leaves and plant material during the Fall leaf season. 😡

    So how do we dispose of those mountains of compostable material? Western says their solution will be to continue accepting those paper bags but then to EMPTY THEM BY HAND at their Boulder facility before sending the compostable contents on to A1. How crazy expensive is that going to be?

    Please consider verifying this important detail with Western and adding it to your story.

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