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Communities across the United States are discovering 1,4-dioxane in drinking water supplies. This industrial chemical has been linked to cancer and other serious health risks and is extremely difficult and expensive to remove from water systems.
Public water authorities, municipalities, and government agencies are increasingly pursuing lawsuits against chemical manufacturers and industrial polluters responsible for releasing 1,4-dioxane into the environment.
If your community has detected 1,4-dioxane contamination in drinking water, legal options may be available to recover the high costs of investigation, treatment, and long-term remediation.
2026Municipalities and public water systems across the United States continue evaluating legal claims against chemical manufacturers and industrial facilities alleged to have released 1,4-dioxane into groundwater and drinking water supplies.
Many communities are seeking recovery of costs associated with:
As monitoring for emerging contaminants increases, additional litigation related to 1,4-dioxane contamination is expected.
July 2025Federal Court Allows Major 1,4-Dioxane Case to Proceed
A federal court in the Eastern District of New York allows key claims to move forward in Suffolk County Water Authority v. Dow Chemical Company, a major lawsuit alleging groundwater contamination affecting public drinking water supplies.
The case involves claims that chemical manufacturers contributed to contamination affecting wells serving communities on Long Island.
March 2023The New Jersey Attorney General and the New Jersey Department of Environmental Protection (NJDEP) filed a lawsuit against several chemical manufacturers alleging contamination of groundwater and natural resources by 1,4-dioxane.
The lawsuit seeks damages for:
April 2012The Agency for Toxic Substances and Disease Registry (ATSDR) and other federal health agencies publish information identifying potential health risks associated with exposure to 1,4-dioxane, including cancer risks based on toxicological studies.
1,4-Dioxane is a synthetic industrial solvent used in the production of chlorinated solvents and other chemicals. It can also occur as a byproduct of manufacturing processes, including the production of detergents, cosmetics, and cleaning products.
Environmental agencies have identified 1,4-dioxane as an emerging drinking water contaminant because of its unusual chemical properties.
Unlike many contaminants, 1,4-dioxane:
Because of these characteristics, once released into the environment, 1,4-dioxane can travel long distances through groundwater and persist in aquifers that supply public drinking water systems.
“Dioxane doesn’t go away. Every molecule that was ever made is still floating around Planet Earth somewhere. Even if it was phased out decades ago, it is still making its way through our environment, migrating through soil and groundwater.” – Levin Papantonio Attorney Ned McWilliams
The U.S. Environmental Protection Agency (EPA) has identified 1,4-dioxane as a contaminant of concern and has required nationwide monitoring through the Unregulated Contaminant Monitoring Rule (UCMR) program.
As testing has increased, more public water systems are detecting 1,4-dioxane contamination in groundwater and surface water supplies.
In the U.S. Environmental Protection Agency’s Risk Evaluation for 1,4-Dioxane, the EPA determined that 1,4-dioxane presents an unreasonable risk to human health. The agency identified several health risks associated with exposure, including liver toxicity, adverse effects in the olfactory epithelium, and cancer resulting from inhalation or dermal exposure, as well as ingestion through contaminated drinking water.
The EPA has established a drinking water health reference level of 0.35 parts per billion. Long-term exposure, even at low concentrations, raises significant public health concerns for communities.
Conventional drinking water treatment systems do not effectively remove 1,4-dioxane. Utilities must rely on advanced technologies such as:
These systems require significant capital investment and ongoing operational costs that can continue for decades.
In many cases, infrastructure installed to address other contaminants does not effectively remove 1,4-dioxane. As a result, utilities may face additional upgrades and expenses beyond prior investments.
Environmental agencies identify industrial releases as the primary source of 1,4-dioxane contamination.
Common pathways include:
Because the chemical moves easily through groundwater, contamination can migrate far beyond the original release site and impact municipal wells, private wells, and surface water sources.
Currently, there is no enforceable federal Maximum Contaminant Level (MCL) for 1,4-dioxane under the Safe Drinking Water Act.
However, the EPA has completed a risk evaluation under the Toxic Substances Control Act (TSCA) and determined that the chemical poses unreasonable risks to human health under certain conditions of use.
EPA has also indicated that additional regulatory actions may be forthcoming.
Several states have adopted their own drinking water standards or guidance levels for 1,4-dioxane, including:
These varying standards create a patchwork regulatory landscape, often leaving municipalities responsible for costly treatment and compliance.
As contamination has become more widely recognized, litigation over 1,4-dioxane pollution has expanded nationwide.
Municipal water providers have filed lawsuits against chemical manufacturers and industrial polluters, alleging that their activities caused widespread groundwater contamination.
Some of the most significant cases involve public water systems seeking recovery of the substantial costs required to protect drinking water supplies.
Damages Sought by Public Water Systems
Water authorities and municipalities may seek compensation for:
These lawsuits often rely on federal and state environmental laws that allow cost recovery for contamination cleanup and environmental damage.
Environmental contamination litigation often develops before comprehensive federal standards are in place. Utilities that act early can:
Active cases are already pending in state and federal courts involving public water systems seeking cost recovery.
If your municipality or water authority has detected 1,4-dioxane in its drinking water, you may be entitled to recover substantial costs related to testing, treatment, and remediation.
Our environmental litigation team represents public entities in complex contamination matters and works to secure funding from responsible parties.
Contact us for a confidential, no-obligation case evaluation to discuss your community’s situation.
1,4-Dioxane contamination has been linked to chemical manufacturers, industrial facilities, and companies that produced or used chlorinated solvents containing the chemical. In some cases, manufacturers that produced stabilizers or solvent products containing 1,4-dioxane have been named in litigation. Liability often depends on the source of contamination and the specific industrial activities involved.
Removing 1,4-dioxane from drinking water can be expensive. Advanced treatment systems, such as advanced oxidation processes (AOP) or UV oxidation systems, can require millions of dollars in capital costs for installation, along with significant ongoing operational and maintenance expenses for water utilities.
1,4-Dioxane contamination has been detected in drinking water supplies and groundwater across multiple states, including New York, New Jersey, Michigan, North Carolina, California, and others. Many detections occur near historical industrial facilities, chemical manufacturing plants, or areas where solvent production occurred.
Yes. 1,4-Dioxane contamination cases are often compared to PFAS litigation because both involve persistent chemicals that contaminate drinking water supplies and require costly treatment technologies. Like PFAS lawsuits, municipalities often seek to recover water treatment and environmental remediation costs from responsible companies.
1,4-Dioxane can persist in groundwater for many years because it does not readily biodegrade and moves easily through water. Without treatment or remediation, contamination may remain in aquifers that supply drinking water for extended periods.
1,4-Dioxane is considered an emerging contaminant because it has only recently been widely tested for in drinking water systems. Improved monitoring programs have revealed that the chemical may be more widespread than previously recognized.
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