What’s in your drinking water? Activists want tests for microplastics

When you’re drinking a glass of water, you might not think about the potential for microplastics floating around inside the cup.

Earlier this month, the Environmental Protection Agency proposed new standards for monitoring our drinking water, a move that lays the groundwork for future safety regulation.

But microplastics aren't included on the list — and many advocacy groups are concerned.

More than 250 health professionals added their names to a May letter to the EPA that called microplastics "a public health crisis that can no longer be ignored."

“It is estimated that the average person consumes 4,000 or more microplastic particles annually from drinking water alone,” the letter continued.

The EPA released a statement to LAist Wednesday saying the agency "acknowledges the interest in and concern for microplastics in drinking water" and is in the process of taking steps to prioritize the needed research.

Why it matters

The proposed new testing program would require public water facilities to test for a list of up to 30 chemicals and contaminants such as pesticides and PFAS — dubbed "forever chemicals" — which are found in products like nonstick cookware.

Water safety advocates say it’s important to test for those chemicals because they can seep into water systems by runoff, factory leaching and landfill leakages. Experts say testing the substances helps identify what contaminants pose a health risk, and how much is present in water systems.

Safety advocates say they want microplastics added to the list because research has shown that ingesting them is potentially harmful to humans.

Over the past few years, governors, attorneys general and almost 200 organizations sent letters to the EPA urging the agency to include microplastics on the test list.

Among them is California Attorney General Rob Bonta, who is part of a 14-state coalition petitioning to add microplastics to the proposed new screening list, known formally as the UCMR 6.

“Microplastics clearly warrant further monitoring and regulation due to their prevalence throughout the environment and the rapidly growing evidence of their negative impact on the environment and public health,” Bonta and others stated in a joint letter to the EPA last month.

So what’s the challenge?

It takes time to develop, test and approve methods for testing certain contaminants in water so that public systems can uniformly and consistently measure them. With microplastics, the research just isn’t there yet, according to EPA officials.

“There is no validated EPA or consensus drinking water analytical method with the proper quality control data, accuracy, and precision that could be used for UCMR 6,” agency officials said in a filing published early this month in the Federal Register.

What this means locally

The good news for Southern California residents concerned about microplastics is that the state has pulled ahead of the federal government in microplastic screenings. A law passed in 2018, Senate Bill 1422, called on regulators to implement a testing plan for microplastics in large community water systems.

Implementation of the law is still in its early stages, so only certain providers are required to test for microplastics. The state chose departments based on water supply, size of agency and forms of treatment.

Once more analysis is done with these agencies, the law is designed to expand its reach to all water departments.

The Irvine Ranch Water District is one of the agencies selected by the state to perform testing.

Although validated methods have not yet emerged, Jim Colston, the district's director of water quality and regulatory compliance, said he is confident that the area’s water is safe.

“There are many pervasive sources of microplastics in the environment, but the public water supply has not been shown to be a significant source,” Colston said.

LAist spoke to authorities at several Southern California water departments, and all said that consumers should not worry about their drinking water.

“Our drinking water is safe,” said Pat Versluis, director of water quality for the Orange County Water District, which serves 2.5 million people in the central and North Orange County area.

“I'd say the state of California's process, it's been methodical for several years," Versluis said. "They seem to be getting closer to a more refined sample collection, sample analysis, and kind of process for monitoring water sources.

"And we're following that closely.”

Where you come in

• The UCMR 6 program still needs to be finalized by the end of the year.
• Once it goes into effect in January 2028, the list of substances will be tested in a three-year sample period. The process of examining the research can then take two or more years after that.
• The EPA is accepting public comments on this issue until Aug. 31.
• If you want to weigh in on microplastics testing, you can contact local government representatives or the EPA. (Food and Water Watch, a nonprofit advocacy group, provides templates for people who don’t know where to begin.)