PFAS-credentialed compliance consultants that serve Washington. Listings include both firms headquartered in Washington and out-of-state firms with active Washington project coverage. See the Washington compliance page for contamination data and regulatory deadlines that drive this work.
Top-5 global engineering firm with deep PFAS practice — treatment system design-build, AFFF investigation at DOD installations, and regulatory consulting.
Nonprofit applied science organization developing PFAS destruction technologies including supercritical water oxidation (SCWO) and PFAS Annihilator systems. Conducts PFAS treatability studies and fiel...
Employee-owned environmental engineering firm specializing in water and wastewater. PFAS treatability studies and full-scale design for U.S. utilities.
Employee-owned engineering and construction firm with PFAS treatment design, AFFF replacement programs at airports and military bases, and PFAS destruction technology evaluation. Active prime on DoD A...
Employee-owned A/E firm with a national water practice that has designed PFAS treatment systems (GAC, IX, RO) for multiple U.S. utilities. Active in UCMR-5 sampling support and EPA MCL compliance plan...
Major federal contractor for DOD AFFF-impact investigation, IRP/MMRP site work, and PFAS remediation under USACE and AFCEC IDIQs.
National environmental and water resources consultant with PFAS site assessment, soil/groundwater remediation, and treatment system design services. Provides PFAS compliance support for industrial cli...
Largest U.S. firm exclusively dedicated to water/wastewater engineering. Significant PFAS pilot and design work for California and Western U.S. utilities.
West Coast water-focused engineering firm. PFAS treatment design and pilot work for California and Pacific Northwest municipalities.
Federal services contractor with major DoD environmental remediation portfolio including PFAS investigation, remedial action, and AFFF transition support at Air Force, Navy, and Army installations. Ho...
Employee-owned national geotechnical and environmental consulting firm with PFAS site assessment, Phase II investigation, and remedial design services. Active across DoD, industrial, and airport PFAS ...