EPA Petition Seeks Nationwide Rule to Regulate 1,4-Dioxane and Surfactants in Liquid Laundry Detergents

On January 6, 2026, a formal legal petition landed on the desk of the U.S. Environmental Protection Agency, targeting the heavy plastic jugs sitting in almost every American laundry room. The filing did not focus on industrial dumping or agricultural runoff, but rather on the daily routine of washing clothes. It asked the federal government to formally declare that the chemical residues left behind on freshly laundered fabrics present an unreasonable risk to human health. For the average homeowner or renter standing in the cleaning aisle, the petition challenges the basic assumption that a standard wash cycle completely rinses away the chemicals used to lift stains.[1][2]

Filed under Section 21 of the Toxic Substances Control Act (TSCA) by petitioner Andrew Gonzalez, the document asks the EPA to initiate a nationwide rulemaking process for liquid laundry detergents. Specifically, it targets three interconnected substances: Sodium C10-16 alkylbenzenesulfonate, Sodium laureth sulfate (SLES), and 1,4-dioxane. While the first two are active cleaning agents known as surfactants, the third is a highly scrutinized manufacturing impurity. The petition demands that products containing these chemicals carry mandatory warning labels identifying them as known skin irritants, alongside a mandatory disclosure if 1,4-dioxane is detectable above 0.1 parts per million.[1][2]

To understand why 1,4-dioxane is in laundry detergent at all, a consumer has to look at how modern soap is made. 1,4-dioxane is never intentionally added to a cleaning product. Instead, it is a chemical byproduct created during a manufacturing process called ethoxylation. Manufacturers use ethoxylation to make harsh cleaning agents, like SLES, gentler on human skin and more effective at creating suds. However, this chemical reaction inadvertently generates trace amounts of 1,4-dioxane, which remain suspended in the final liquid detergent that ships to store shelves.[2][3][4]

The petition introduces a modern mechanical complication to this chemical reality: the rise of High Efficiency (HE) washing machines. Designed to conserve water and energy, HE machines use significantly less water per load than older agitator models. The filing cites consumer reports indicating that these low-water cycles often fail to fully rinse surfactants and byproducts out of the fabric. When a person wears those clothes, the petition argues, it creates a continuous dermal exposure pathway, pressing trace chemicals directly against the skin all day.[2]

The presence of 1,4-dioxane is heavily scrutinized because the EPA classifies it as a likely human carcinogen. Federal health agencies have linked high levels of exposure to liver and kidney toxicity in animal studies, as well as nasal tissue irritation. Because it is a byproduct rather than an ingredient, 1,4-dioxane does not appear on the ingredient label of any household product, making it virtually impossible for a shopper to know if their chosen brand contains it.[4]

Beyond the laundry room, the chemical presents a severe municipal infrastructure problem. When a washing machine drains, the wastewater carries 1,4-dioxane into local sewage and septic systems. The chemical mixes readily with water, does not stick to soil, and resists breaking down. Standard municipal water treatment plants are not designed to filter it out, meaning the byproduct from thousands of residential washing machines can pass through treatment facilities and eventually contaminate local groundwater and drinking water supplies.[4]

The push for a federal rule follows years of fragmented, state-level crackdowns that have already forced the industry to adapt. New York State led the charge by passing a first-of-its-kind law that banned the sale of household cleaning products containing more than 2 parts per million of 1,4-dioxane by the end of 2022, tightening the limit to 1 part per million by January 2024. Independent testing by environmental advocacy groups found that prior to the law, some popular laundry detergents contained concentrations as high as 14 to 17 parts per million.[3]

California is currently following a similar regulatory path. In late January 2026, the state's Department of Toxic Substances Control (DTSC) initiated the administrative process to list manual detergents and shampoos containing 1,4-dioxane in excess of one part per million as a "Priority Product." If finalized, this designation would force manufacturers selling in California to conduct rigorous alternatives analyses and potentially face use restrictions or sale prohibitions, further fracturing the national market for cleaning supplies.[5]

The cleaning product industry maintains that the current formulations on store shelves are entirely safe for daily household use. The American Cleaning Institute, a major trade association, emphasizes that the parts-per-million trace levels of 1,4-dioxane found in modern detergents are far too small to pose a reasonable risk to consumers. They point to a 2020 EPA risk evaluation which concluded that certain consumer products containing the byproduct do not present an unreasonable risk of injury to human health.[3]

Furthermore, industry representatives highlight that major detergent manufacturers have already spent millions of dollars reformulating their products to comply with New York's stringent 1-part-per-million standard. Because it is logistically inefficient to manufacture separate formulas for different states, many major brands have rolled out their low-dioxane formulations nationwide. The industry argues that a new federal labeling mandate would unnecessarily alarm consumers over a problem that the market is already actively solving through advanced manufacturing techniques.[3]

Despite the industry's assurances, the regulatory landscape remains uncertain. Under the Toxic Substances Control Act, the EPA is legally required to grant or deny a Section 21 petition within 90 days of receipt. For the January 2026 laundry detergent filing, that statutory deadline expired on April 6, 2026. As of late summer, the agency has yet to issue a formal response, leaving both consumer advocates and chemical manufacturers waiting for a definitive federal stance on the issue.[1][2][6]

The delay comes as the EPA conducts a broader, agency-wide re-evaluation of 1,4-dioxane. While the 2020 assessment found no unreasonable risk from consumer cleaning products, the agency released a supplemental analysis in late 2024 indicating that it was reconsidering exposure pathways, particularly regarding drinking water contamination and occupational hazards. The outcome of this overarching risk evaluation will likely dictate how the agency handles the specific demands of the laundry detergent petition.[1][6]

For the household buyer navigating the detergent aisle today, the regulatory tug-of-war highlights a gap in how products are marketed. Labels boasting "Free and Clear" or "Sensitive Skin" typically refer to the removal of added dyes and artificial fragrances. Because 1,4-dioxane is an invisible manufacturing byproduct of the surfactants that actually do the cleaning, a product can be marketed as hypoallergenic while still containing trace levels of the chemical.[2][6]

Until the EPA issues a ruling on the petition, the burden of navigating chemical exposure remains largely on the consumer and state regulators. If the agency eventually grants the request, it would trigger a massive overhaul of household product labeling, forcing brands to disclose impurity levels and fundamentally changing how Americans perceive the safety of their daily laundry routine. If denied, the battle will likely remain a state-by-state effort to drive the chemical out of the municipal water supply.[5][6]