TRI Adds Sodium PFHxS-Na to Its PFAS List: What Facility Compliance Teams Need to Know

EPA has added sodium perfluorohexanesulfonate, known as PFHxS-Na, to the Toxics Release Inventory, bringing the total number of reportable PFAS substances to 206. The addition took effect January 1, 2026, and facilities using or releasing the chemical above a 100 pound threshold now have a reporting obligation with a first deadline of July 1, 2027.

For manufacturers working with metal plating, surface coatings or related PFAS-containing processes, this addition is a reminder that the TRI's PFAS list keeps growing, and the reporting math for these chemicals works differently than it does for most other substances on the list.

What Just Changed on the TRI List

EPA finalized the rule adding PFHxS-Na on February 23, 2026, following an October 2025 announcement that the chemical would be listed. The trigger was a newly finalized EPA toxicity value covering PFHxS and its related salts, published through the agency's Integrated Risk Information System process.

PFHxS itself, along with some related salts, was already on the TRI list. PFHxS-Na specifically had not been included until this new toxicity assessment identified it separately. A few details define this addition:

• The reporting period for PFHxS-Na began January 1, 2026, meaning facilities should already be tracking relevant activity.

• The first reports covering this chemical are due to EPA by July 1, 2027.

• This addition happened automatically under a process established by the 2020 National Defense Authorization Act, which requires EPA to add qualifying PFAS to the TRI each year without a separate rulemaking process for each one.

Chemicals of Special Concern: Why the Threshold Is Different

PFHxS-Na was added as a chemical of special concern, a designation EPA applies to persistent, bioaccumulative substances including most PFAS on the TRI list. This classification changes the practical reporting math significantly compared to standard TRI chemicals.

Most TRI-listed chemicals carry reporting thresholds of 25,000 pounds for manufacturing or processing and 10,000 pounds for otherwise using the substance. Chemicals of special concern, including PFHxS-Na, instead carry a much lower 100 pound threshold that applies uniformly, regardless of whether the facility manufactures, processes or uses the chemical.

Where PFHxS-Na Shows Up in Manufacturing

PFHxS-Na is a surfactant commonly associated with a handful of specific industrial applications. Understanding where it typically appears helps facilities assess their own exposure.

• Firefighting foam formulations, an application shared with several other PFAS substances already on the TRI list.

• Surface coatings, where PFAS surfactants help with wetting and leveling properties during application.

• Metal plating and polishing operations, along with semiconductor cleaning processes that rely on similar surfactant chemistry.

The Compliance Calendar Facilities Need to Know

Facilities already tracking PFHxS-Na activity since the start of 2026 have a runway before their first report is due, but that runway is shorter than it might appear given the data collection involved. A few dates anchor the compliance calendar:

• January 1, 2026: the reporting period for PFHxS-Na officially began.

• July 1, 2027: the deadline for the first TRI reports covering 2026 activity involving this chemical.

• Ongoing: facilities must continue tracking manufacture, processing, use and release activity throughout each calendar year going forward, not just in the lead up to the deadline.

How the Special Concern Designation Removes the De Minimis Exemption

Beyond the lower reporting threshold, chemicals of special concern lose access to the de minimis exemption that normally lets facilities disregard very small concentrations of a chemical when determining whether TRI thresholds apply. This exemption removal also extends to TRI's supplier notification requirements.

In practical terms, this means facilities cannot rely on small trace concentrations of PFHxS-Na falling below a reporting radar the way they might with other regulated substances. Even minor concentrations in a mixture or process stream need to be accounted for when assessing whether the 100 pound threshold has been crossed.

Which Facilities Are Covered

TRI reporting obligations generally apply to facilities in specific industry sectors that manufacture, process or otherwise use listed chemicals above the applicable threshold and meet employee count criteria. For a chemical like PFHxS-Na, the sectors most likely to encounter this obligation include metal finishing operations, coatings manufacturers, and facilities involved in firefighting foam production or use.

Facilities that have not historically tracked PFAS reporting closely should not assume they fall outside scope simply because their PFAS use feels incidental. The lower threshold and lost de minimis exemption both increase the chance that smaller scale users get pulled into reporting obligations they might not have faced with other TRI chemicals.

What Manufacturers Should Do Before July 2027

Facilities working with metal plating, coatings, semiconductor processes or firefighting foam should treat the PFHxS-Na addition as an immediate action item rather than something to revisit closer to the 2027 deadline. Data covering all of 2026 needs to be captured accurately, and the tracking obligation is already active.

Steps worth prioritizing now:

• Confirm whether PFHxS-Na is present in any raw materials, formulations or process chemistries currently in use at the facility.

• Update internal data tracking systems to capture the chemical's use and release activity against the 100 pound threshold rather than the standard TRI thresholds.

• Reach out to suppliers to clarify whether PFHxS-Na appears in any purchased materials, since the loss of the de minimis exemption raises the stakes on overlooking small concentrations.

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Reference link

https://www.epa.gov/pfas/key-epa-actions-address-pfas