Allegra da Silva, Ph.D., P.E., is Municipal PFAS
Leader for Brown and Caldwell in Denver, Colorado.
She is a recognized industry leader with expertise in
water reuse, pathogen fate and transport, PFAS water
and wastewater treatment, policy, and innovation.
Kati Bell, Ph.D., P.E., BCEE, is Managing Director at
Brown and Caldwell in Nashville, Tennessee. She is
an industry leader in environmental engineering, with
a focus on research and innovation to identify and
develop innovative, efficient, and sustainable solutions.
Helene Baribeau, Ph.D., P.E., is a Managing Princi-pal
at Brown and Caldwell in San Diego, California.
She is a distribution system water quality leader
with experience in engineering, chemistry, microbi-ology,
and water industry regulations.
Jim Claffey, Ph.D., P.E., is Senior Director for Brown
and Caldwell in Upper Saddle River, New Jersey. He
provides leadership around emerging contaminants
in the environment, drinking water, wastewater,
groundwater, biosolids, and other media.
ROCKY MOUNTAIN WATER SEPTEMBER-OCTOBER 2021 | 35
1. Prepare now for public engagement around emerging
contaminants. Take advantage of industry toolkits
to begin proactive risk communication to help build
public trust and lead the conversation, despite the
ambiguity the industry is facing.
2. Consider whether regulations for PFAS in drinking
water, wastewater, biosolids, or construction
dewatering would change plans now or in the
next several years. PFAS can slow down general
construction projects if construction dewatering
requires treatment. Some drinking water utilities may
choose to conduct proactive PFAS monitoring ahead
of the Fifth Unregulated Contaminant Monitoring
Rule in 2023-2025 and begin bench or pilot testing
of treatment alternatives before requirements are
Our industry continues to rise to the challenge to find
treatment technologies to address the chemicals we know
and will continue to develop tools for new contaminants
of concern as they emerge, leveraging sound science and
engineering to protect public and environmental health.
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