PFAS-credentialed treatment system designers & installers 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.
Employee-owned environmental engineering firm specializing in water and wastewater. PFAS treatability studies and full-scale design for U.S. utilities.
Largest granular activated carbon (GAC) manufacturer and treatment-system supplier in North America. Dominant vendor for PFAS GAC adsorption systems including IIJA-funded municipal projects.
Privately-held engineering firm with a deep municipal water practice. PFAS treatment evaluations, GAC and IX pilot studies, EC-SDC grant application support.
Acquired by Xylem in 2023. Major PFAS treatment-system integrator across GAC, ion exchange, and combined media solutions for municipal and industrial customers.
Water-focused engineering firm known nationally for PFAS treatment research and design. Led pilot work on GAC, IX, and RO for major utilities including OCWD and NYC DEP.
Global activated carbon manufacturer supplying virgin and reactivated GAC (AquaSorb series) for municipal and industrial PFAS removal. Operates US reactivation facilities and is a primary supplier to ...
Activated carbon manufacturer (Cabot Corporation division, formerly Norit) supplying powdered and granular activated carbon for PFAS adsorption in drinking water and industrial applications. Provides ...
Manufacturer of ion exchange resins including PFAS-selective anion exchange resins (ASM-125 series) used by municipal water utilities for PFOA/PFOS removal. Supplies resin media to engineering firms a...
Major federal contractor for DOD AFFF-impact investigation, IRP/MMRP site work, and PFAS remediation under USACE and AFCEC IDIQs.
Global water treatment EPC firm. PFAS removal via GAC, ion exchange, and emerging destruction technologies; design-build and BOOT contracts.
Georgia-based treatment system OEM providing packaged GAC and ion exchange systems specifically marketed for PFAS, arsenic, and emerging contaminant removal at small and mid-sized public water systems...
La Grande, Oregon civil engineering firm with offices in Hermiston, Redmond and Enterprise. Prepared the City of Hermiston's PFAS Mitigation Feasibility Study, adopted in August 2026 as the city's $26...
Largest U.S. firm exclusively dedicated to water/wastewater engineering. Significant PFAS pilot and design work for California and Western U.S. utilities.
Italian-headquartered water treatment OEM with US operations providing GAC adsorbers, ion exchange systems, and electrochemical treatment for PFAS removal. Markets the TETRA filtration and electrochlo...
Global engineering and EPC firm with PFAS treatment design, site investigation, and regulatory advisory work across federal and municipal sectors.
West Coast water-focused engineering firm. PFAS treatment design and pilot work for California and Pacific Northwest municipalities.
German specialty chemicals company with US HQ supplying Lewatit ion exchange resins (TP 108 / S 6328 A) certified for PFAS removal from drinking water. Sells resin media to system integrators and util...
Ion exchange resin manufacturer with PFAS-selective IX media (PFA694E) used in municipal treatment systems nationwide.
Process equipment manufacturer providing GAC contactors, IX vessels, and clarification systems used in municipal PFAS treatment trains. Designs and fabricates pressure vessels and underdrain systems f...
34 Washington water systems tested above the EPA limit for PFOA or PFOS, 20 of them on average. The Washington market brief (PDF plus a workbook with operator contacts) is a one-time $149 download. See a sample →