TSCA lawsuit briefs and EPA motions: two legal paths in court

It is no longer in force.

That sequence is the essential fact behind the phrase “TSCA lawsuit legal briefs versus EPA administrative motions.” It sounds like a contest between two parallel legal tracks. The record supports a narrower, less tidy account: organizations petitioned EPA under the Toxic Substances Control Act, sued after the agency denied their petition, and then faced EPA’s appellate arguments in court. Administrative proceedings and court filings mattered at different stages. They were not two equivalent lawsuits running side by side.

The petition started the clock

On November 23, 2016, organizations filed a citizen petition asking EPA to use Section 6 of TSCA to prohibit fluoridation chemicals as drinking-water additives. The petition invoked Section 21, which provides a route for a person or organization to ask EPA to take a regulatory action under the statute.

EPA denied the petition. In April 2017, the petitioners filed suit under TSCA Section 21, 15 U.S.C. § 2620. That move matters: the lawsuit challenged EPA’s response to a statutory petition. It was not, on the available record, a challenge to a federal law requiring towns to fluoridate their water. The petition asked EPA to prohibit fluoridation chemicals; the sources reviewed for this case do not establish a federal fluoridation mandate.

The distinction is easy to lose in shorthand. “Fluoride lawsuit” can describe the subject, but it does not tell you what the plaintiffs asked a court to do. Here, the case grew from a petition seeking agency action, followed by a statutory lawsuit after EPA rejected that request.

A useful map looks like this:

The filing and the administrative petition connect. They are not interchangeable. One asks the agency to act; the other asks a court to review what happened after the agency said no.

The petition opened the dispute. The lawsuit put EPA’s response before a judge.

Two trials, one district-court ruling

The case did not resolve on a quick motion. The district court held a seven-day bench trial in June 2020. After the case was later lifted from abeyance, a second bench trial began in January 2024 and lasted ten days.

The district court issued findings in September 2024 and entered judgment for Food & Water Watch on November 20. It found that adding fluoride at 0.7 mg/L presented an unreasonable risk to human health and ordered EPA to manage the associated risks under TSCA.

That is the district-court finding, stated at the level the record supports. It is not a final nationwide rule banning fluoridation. It is not a finding by the Ninth Circuit. And, after the appellate decision, it is not a judgment currently standing as entered.

The distinction matters in everyday terms. A trial court can assess a record and issue a remedy. An appellate court can then examine whether the case was properly before the trial court and whether the court handled the record and proceedings correctly. Those are different jobs, and an appellate reversal or vacatur does not automatically supply a new scientific conclusion.

This is where legal coverage often goes off the rails. A district-court finding becomes “the court ruled fluoride unsafe,” then an appeal becomes “the ruling was upheld” or “the ruling was overturned on the science.” Neither compression is safe here. The Ninth Circuit’s identified concerns were procedural and jurisdictional: standing, the relationship between the evidentiary record at trial and the record before EPA, and the district court’s handling of party presentation after the first trial.

The 0.7 mg/L figure belongs to the district court’s unreasonable-risk finding. It should not be presented as a new appellate threshold or as a concentration the Ninth Circuit independently assessed.

What EPA argued on appeal

EPA’s appellate brief framed three issues. Each attacks a different part of the route from petition to judgment.

First, EPA challenged the plaintiffs’ Article III standing. Federal courts require plaintiffs to show a legally cognizable injury that can be traced to the challenged conduct and addressed by the court. Standing is a threshold question. If plaintiffs lack it, a court cannot reach the merits simply because the dispute concerns an important public-health issue.

Second, EPA argued about the evidentiary record. The agency questioned whether the district court relied on a record different from the one presented to EPA with the 2016 petition. That challenge goes to the relationship between the administrative petition and the later courtroom case: what material was before the agency, what material was developed at trial, and what the court could properly use to decide the statutory claim.

Third, EPA argued that the district court violated the party-presentation principle after the first trial. In broad terms, that principle limits a court’s role: parties frame the disputes and present their arguments, while the judge decides the questions properly put before the court. EPA’s appellate position was that the district court crossed that line in its handling of the case.

Those are appellate arguments, not findings that EPA’s account was correct. The Ninth Circuit later vacated and remanded the district court’s decision, but the available memorandum does not say the appellate court resolved the scientific safety of fluoridation. It also does not turn each EPA argument into a holding. The outcome was a vacatur and remand; the issues identified in the appellate materials explain the dispute the panel considered.

That is the right way to read “EPA legal defense strategies water fluoridation”: as a set of legal challenges to standing, the record, and judicial procedure. Calling them motions can blur the record. The confirmed facts describe an appellate brief and the issues it raised; they do not establish a separate catalog of EPA administrative motions operating as a parallel legal path.

EPA’s appeal targeted the court’s authority and process. The appellate memorandum did not settle the underlying science.

What the Ninth Circuit changed

The Ninth Circuit heard argument on March 3, 2026. On May 21, it vacated the district-court decision and remanded the case. That changed the status of the 2024 judgment: it cannot be described as still in force after the vacatur.

But “vacated and remanded” is not a synonym for “the court found fluoridation safe.” Nor does it mean the district court’s scientific finding has become an appellate holding. The memorandum identifies a procedural and jurisdictional dispute, and it says the case returns to the lower court. The reviewed materials do not establish the final outcome of proceedings after remand.

There is another limit worth keeping in view. The Ninth Circuit memorandum is unpublished and states that it is not precedent except as provided by Ninth Circuit Rule 36-3. That does not make the decision irrelevant to this case. It does make broad claims about binding precedent inappropriate.

For readers tracking federal court litigation filings on fluoride, the practical status questions are these:

• The district court entered judgment for Food & Water Watch on November 20, 2024.
• The Ninth Circuit vacated that decision on May 21, 2026, and remanded the case.
• The appellate memorandum did not decide the safety question on the merits.
• The available record does not establish what happened after remand.

That last line is not a footnote. It is the boundary of what can responsibly be said. Any claim that the case has now produced a final ban, a final endorsement of fluoridation, or a definitive nationwide rule would go beyond the facts available here.

Fees, exposure and the limits of a headline number

The litigation also produced a large fee ruling. On January 5, 2026, the district court awarded plaintiffs $5,263,705 in attorney fees and $496,745 in costs. The ruling made payment subject to the pending appeal.

That condition changes how the award should be described. It is a district-court fee award, not a settled payment or an unconditional final liability. The appeal was still pending when the district court issued the ruling, and the Ninth Circuit later vacated the underlying decision and remanded. The available facts do not establish the fee award’s ultimate status after that sequence.

The numbers still show the scale of the case. Two bench trials, years of proceedings, and a substantial fee ruling create real financial exposure for the parties. But the number alone cannot answer who ultimately pays, whether the award survives later proceedings, or what result follows on remand. Those questions require later rulings.

This is where corporate and agency messaging often finds its easiest shelter: a headline can make a conditional award look final, or make a vacatur sound like a merits victory. The paper trail is less convenient. The district court ruled for plaintiffs; the Ninth Circuit vacated that decision; the case went back. Fees were awarded subject to appeal. Each clause carries weight.

The route through the case

For anyone following TSCA Section 21 litigation, the cleanest route is chronological. Start with the petition and EPA’s denial. Then separate the district-court trial record from EPA’s appellate objections. Finally, read the Ninth Circuit’s disposition for what it says, not for the broader result a headline might wish it said.

The case began with a request for EPA to prohibit fluoridation chemicals under TSCA. It became a federal lawsuit after the agency denied that request. The district court made an unreasonable-risk finding at 0.7 mg/L and ordered EPA to manage associated risks. EPA appealed on standing, evidentiary-record, and party-presentation grounds. The Ninth Circuit vacated and remanded without deciding the scientific merits in the identified memorandum.

That is a map, not a verdict on what the next court will do. The remand leaves the case moving, and the status after that point remains unestablished in the record at hand. For now, the most consequential fact is also the least theatrical: the 2024 judgment has been vacated, and the next legal step matters more than anyone’s victory lap.