Work that matters. 15,000+ environmental documents completed.
ESA PWA
With more than 35 years of experience approaching complex water resources problems for clients throughout the Western U.S. and abroad, ESA PWA—previously known as Philip Williams & Associates—is a leader in environmental hydrology.
We integrate rigorous science with practical engineering solutions to address a range of problems affecting environments—from the headwaters to the coast. Serving municipal agencies, non-profits, private consulting firms, and state and federal agencies, ESA PWA complements ESA’s environmental scientists and planners with design and engineering, restoration, and climate change services.
ESA PWA550 Kearny St Ste 900
San Francisco, CA 94108
Ann Borgonovo, PE
415.262.2300
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