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\title{American Chemical Society AMA: I am Susan D. Richardson, Ph.D., a
Professor of Chemistry at the University of South Carolina and expert on
water treatment chemistry. Ask me anything about the chemistry of
swimming pool disinfection!}



\author[1]{AmerChemSocietyAMA }%
\author[1]{r/Science AMAs}%
\affil[1]{Affiliation not available}%


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  \date{April 23, 2026}


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\begin{abstract}
Hi Reddit! Ask me anything about the chemistry of disinfecting water for
swimming pools or other treatment needs!* I'm Susan D. Richardson,
Ph.D., the Arthur Sease Williams Professor of Chemistry in the
Department of Chemistry and Biochemistry at the University of South
Carolina in Columbia, SC. Prior to coming to USC in January 2014, I was
a research chemist for several years at the U.S. Environmental
Protection Agency's National Exposure Research Laboratory in Athens, GA.
For the last several years, I've been conducting research in drinking
water and in swimming pool water---specifically in the study of
toxicologically important disinfection by-products (DBPs). These are the
unintended consequence of trying to kill harmful microorganisms in
drinking water and in pools. The disinfectants kill bacteria and
contaminants that can cause deadly illnesses such as cholera, but they
can interact with natural organic matter formed from decaying leaves and
plants in rivers. Disinfectants like chlorine will react with that
natural organic matter to form DBPs, that can in turn cause detrimental
human health effects in drinking water, including bladder cancer,
miscarriages, and birth defects. Pool DBPs have also been implicated in
cases of asthma and bladder cancer. I work on identifying new DBPs or
other unknown chemicals in the environment, drinking water, and pools
using mass spectrometry. I also study wastewater treatment plants and
the effects of disinfectants on river water. Most recently, I've started
to investigate the impact of hydrofracking on DBPs in water. You can
read about some of my newest research on DBPs in swimming pool and spa
water in this Editor's Choice open access article in Environmental
Science \& Technology and my work is also covered in a recent article
from Chemical \& Engineering News. My B.S. in chemistry and mathematics
is from Georgia College \& State University and my Ph.D. in chemistry is
from Emory University. I also have an honorary doctorate from Cape
Breton University in Canada and was recently named an ACS Fellow. I
serve as an Associate Editor for Water Research, on the Editorial
Advisory Board for Environmental Science \& Technology, and write on
emerging contaminants in water/environmental analysis for Analytical
Chemistry. I'll be on at 1pm EDT. I'm live now! I look forward to
answering your questions! -sr%
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