- Advanced Geoservices, Inc
 - Chadds Ford - Designs and oversees assessment and remediation of contaminated industrial sites; also designs environmental monitoring software. - AmericanAnglian
- Voorhees - Operates wastewater treatment facilities.
- Aramsco
- Thorofare - Supplier of environmental safety products.
- Drexelbrook Engineering Company
- Horsham - Instruments for measuring the level of liquids, solids, slurries, and liquid/liquid interfaces using both RF admittance and ultrasonic technologies.
- ECS Inc.
- Exton - Providers of integrated environmental risk management services to business and industry worldwide through environmental insurance, specialised risk control services and claims management.
- EnQuip Company
- Exton - Distributor of equipment for potable water and wastewater treatment from screening to disinfection.
- Envirite Corporation
- Plymouth Meeting - Specialising in the treatment and recycling of metal-bearing liquids and solids, including contaminated solids and debris.
- Envirogen
- Lawrenceville - Develops and applies technologies for both remediation and pollution prevention with emphasis on bioremediation, biotreatment and various subsurface vapor processes.
- Environmental and Engineering Solutions, Inc.
- Elkins Park - Providing air quality consulting, environmental, health and safety management, and environmental engineering services to industry.
- Environmental Tectonics Corporation
- Southampton - Designs and manufactures sophisticated, custom engineered devices for specialised markets.
- Hardy, Joseph T. & Son, Inc.
- New Castle - Providing mechanical and environmental services to industry, business, and homeowners.
- Indoor Air Solutions, Inc.
- Pottstown - An indoor air quality testing and diagnostic firm.
- K2BW Environmental Equipment Co.
- Willow Grove - Provide instrumentation integration, design, maintenance, and repair services to the source emissions monitoring community.
- MarTech Systems, Inc.
- Lawrenceville - Engineering consulting services on boiler water treatment for steam generating systems. Marketing consulting services for water treatment chemical suppliers.
- PARS Environmental, Inc.
- Robbinsville - Offers solutions to a broad range of engineering, health and safety, and environmental issues.
- Powell-Harpstead, Inc.
- Cinnaminson - Offering environmental, geotechnical, and construction services.
- Res-Kem Corp.
- Media - Manufactures pre-engineered and custom water treatment equipment, including softeners, dealkalizers, filters, demineralizers, deionizers, reverse osmosis systems and WFI systems.
- RMI Environmental
- Plymouth Meeting - Providing asbestos abatement, site assessments & remediation, storage tank closures, facility decontamination and dismantlement.
- Roy F. Weston, Inc.
- West Chester - Services include air, water and waste management; assessment and remediation; and occupational health and safety services.
- Terra Systems Inc
- Wilmington - Offers feasibility and field remediation services to solve a wide variety of industrial groundwater and soil contamination problems.
- TurnKey Environmental Services, Inc.
- Upland - Specialists in the operation, maintenance and design of wastewater treatment facilities and in the management of the supply of wastewater services.
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