Tasha Stoiber
Senior Scientist
San Francisco

Areas of Expertise

  • Flame retardants
  • Healthy Home
  • Lead
  • PFAS
  • Tap water

Press Contact

To schedule an interview with Tasha Stoibe, contact:


  • Ph.D., Environmental Chemistry and Technology, University of Wisconsin, Madison
  • B.S., Biology and Environmental Engineering, Michigan Technological University


Tasha Stoiber works to better understand the connections between exposure to chemicals and public health. She researches contaminants in water, indoor air pollution and chemicals in consumer products. Before joining EWG, Stoiber worked as an environmental engineer. She pursued postdoctoral study in the ecotoxicology of nanoparticles at the University of California, Davis and the U.S. Geological Survey.


In the News

“One of the biggest takeaways here is we’re not just detecting just PFOA and PFOS in these systems, but it’s a mixture of different PFAS chemicals.”
- Tasha Stoiber
September 25, 2019
"They're called forever chemicals because once they get into the environment, they don't degrade. Once they get into your body, they tend to accumulate in organs. They like to stick to proteins in your body. These are chemicals the body hasn't seen before, and they can basically affect every system -- your liver, your kidneys.”
- Tasha Stoiber
September 27, 2019
“While PFAS has contaminated communities all over the country, the crisis has been under the radar in California until now. PFAS pollution in California is much more widespread than we knew.”
- Tasha Stoiber
September 26, 2019
“We need to look at contaminants as a group -- not just one at a time. It's more important to analyze co-occurring contaminants to understand the real world exposure.”
- Tasha Stoiber
April 30, 2019
“More research is needed in understanding how pollutants' interactions affect humans. Because little is known about these interactions, the study could overestimate or underestimate the risks.”
- Tasha Stoiber
May 1, 2019
“People take clean water for granted. Most of the systems in the U.S. do pass federal drinking water standards, but that doesn’t mean it’s entirely safe, especially for more susceptible groups, which could include pregnant women, children or those with compromised health states. Even low levels of contamination could cause harm to your health. Water quality could be much better.”
- Tasha Stoiber
October 23, 2019
“A large majority of the cancer risk, about 85% of it, is due to the combination of contaminants that are present at legal limits. These cumulative risks are based on health-based standards, not legally enforceable levels. So although the drinking water may get a passing grade, there still may be some health risks associated with it.”
- Tasha Stoiber
May 1, 2019
“Drinking water often contains more than one contaminant. If we’re just thinking about drinking water, this kind of assessment more accurately reflects what you would see in real life exposures.”
- Tasha Stoiber
April 30, 2019

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