- Atlantic Ultraviolet Corporation
 - Hauppauge - Manufacturers of residential and commercial ultraviolet water purifiers for potable and wastewater systems, as well as air sanitizers and lamps. - Cascade Water Services
- Hicksville - Water treatment equipment sales, installation, cleaning, rebuilding and repair. Also providing chemical sales, laboratory services, and indoor air quality testing.
- Ducon Environmental Systems, Inc.
- Farmingdale - Manufactures equipment for the control of toxic emissions and for recovery of products in a variety of industrial, chemical, utility, and municipal applications.
- Fenley & Nicol Environmental, Inc.
- Deer Park - Offering environmental consulting, waste management, assessments, remediation, studies, and more.
- Home Healthy Homes
- Northport - Provider of basement waterproofing, mould removal, and indoor air quality services. Home Healthy Homes serves Long Island, the five boroughs of New York City, and Westchester and Fairfield County, CT.
- LND, Inc.
- Oceanside - Designers and manufacturers of nuclear radiation detectors.
- Misonix Incorporated
- Farmingdale - Designs, manufactures and markets ultrasonic equipment, ductless fume enclosures for filtration of gaseous contaminates, and environmental control products for the abatement of air pollution.
- Organica, Inc.
- Great Neck - Formulator of a broad range of environmentally friendly institutional, agricultural, environmental and consumer products and services.
- P.W. Grosser Consulting Engineer and Hydrogeologist
- Bohemia - Providing pollution and solid waste management, as well as water and wastewater treatment and facility design services.
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