Colorado Mass Balance Debate Underscores Industry Faultlines

Why It Matters

The outcome will influence how recycled content is quantified and marketed, affecting billions of dollars in packaging investments and the credibility of sustainability claims across the plastics industry.

Key Takeaways

• ACC withdrew lawsuit but can refile later
• Colorado will review alternative mass‑balance methods this summer
• Free‑allocation credit risks green‑washing, says critics
• Other states and federal bill may adopt similar standards
• EU plans fuel‑excluded mass‑balance for single‑use plastics

Pulse Analysis

Colorado’s extended producer responsibility (EPR) program has become a flashpoint for the plastics industry after the American Chemistry Council (ACC) voluntarily dismissed its lawsuit over mass‑balance allocation methods. The legal action, filed in late 2025, challenged the state’s decision to exclude free‑allocation and fuel‑excluded credit methods from recycled‑content calculations. While the suit is now on hold, the Colorado Department of Public Health and Environment (CDPHE) will continue implementing the current plan and will provide the advisory board with additional guidance on alternative credit methodologies over the summer. This pause underscores the industry’s preference for litigation as a bargaining chip rather than a first resort, and it signals that ACC remains vigilant about protecting its members’ investments in chemical‑recycling technologies.

At the heart of the controversy is how recycled content is quantified. Mass‑balance accounting allows companies to claim recycled credits based on overall input‑output flows rather than physical incorporation, with four recognized methods ranging from proportional to non‑proportional free allocation. Proponents argue that flexible methods capture the benefits of advanced chemical recycling, which can turn mixed waste into fuels and polymers. Critics, including the Ocean Conservancy, warn that free‑allocation can be exploited for green‑washing, eroding consumer trust and undermining genuine recycling markets. The debate is especially acute as mechanical PET bale prices have collapsed, making robust accounting essential for premium pricing of recycled‑content products.

The Colorado dispute mirrors a national and international scramble to set consistent recycled‑content standards. California’s pending AB 2253 would bar credit‑based mass‑balance from post‑consumer definitions, potentially reshaping labeling for plastics, paper, textiles, and glass. At the federal level, the Recycled Materials Attribution Act seeks to codify recycling claims but faces pushback over its reliance on third‑party certification. Meanwhile, the European Commission is drafting a fuel‑use‑excluded mass‑balance framework for the Single‑Use Plastics Directive, hinting at a more unified approach across the EU. These parallel tracks suggest that the outcome in Colorado could set a precedent, influencing policy design, industry investment, and the credibility of sustainability claims worldwide.