Top St. Louis, MO Greentech Companies (13)

Recycled Plastics Industries, LLC manufactures high-quality poly lumber primarily from recycled high-density polyethylene. It provides custom colors and profiles for industrial partners, serving applications including outdoor furniture, marine construction, and residential and commercial building projects. Its U.S.-made products offer a durable, sustainable alternative to traditional lumber, with business-to-business sales and customized manufacturing solutions. It emphasizes quality, customer service, and material...

ENFRA is a national energy infrastructure and Energy-as-a-Service provider delivering vertically integrated engineering, construction, maintenance, asset management, and energy solutions. It serves mission-critical sectors including healthcare, higher education, and data centers, helping clients achieve measurable energy savings, reduce emissions, and build resilient infrastructure nationwide. Its mission is to deliver innovative solutions that empower customers and promote a sustainable future.

We're Ameren Corporation (AEE), a St. Louis-based, Fortune 500 company that powers the quality of life for millions of people throughout Illinois and Missouri. Ameren Illinois provides electric distribution and transmission service, as well as natural gas distribution service, while Ameren Missouri provides vertically integrated electric service, with generating capacity of over 10,200 megawatts, and natural gas distribution service. Combined,...

For 40 years, the consulting engineers at HRP have worked together with our clients to assure that they reach their intended business goals and achieve the right solutions to their environmental and civil engineering challenges. HRP Associates, Inc. was founded in 1982 to serve the environmental needs of the regulated community subject to the newly-enacted Resource Conservation Recovery Act (RCRA). Today,...

Filtration Group is on a mission to make the world safer, healthier and more productive. With a passionate workforce, global footprint and world class engineering and manufacturing capabilities, we are driving innovation and developing solutions across a broad spectrum of applications in the fast-growing global filtration industry.

We are a global climate technologies company engineered for sustainability. Today, we are building on our 100-year legacy through industry-leading innovation, putting Copeland at the forefront of positive change. We create sustainable residential, commercial and industrial spaces through HVACR technologies. We maintain the integrity of goods throughout the cold chain. And we bring comfort to people globally.

TruGreen is the nation's largest lawn care company, providing services such as lawn, tree, and shrub care, as well as mosquito and pest control, focusing on science-based solutions for healthy lawns.

Redefining Water Infrastructure Modeling and Asset Management through Machine Learning

Progressive Recovery, Inc. (PRI) specializes in the design and manufacture of innovative clean-technology systems, including closed-loop solvent recycling, biowaste sterilization, and industrial filtration. Serving sectors such as pharmaceuticals, printing, and oil and gas, the company focuses on safeguarding the environment and maximizing operational efficiency through its expertise in process management and custom fabrication.

HDR is an employee-owned design firm specializing in engineering, architecture, environmental and construction services. We’re ranked No. 6 among the world’s design firms and we’re the largest healthcare design firm. Led by the strength of our values and a culture shaped by employee ownership, we network with each other, build on each other’s contributions, and collaborate together to make great...

From Upstream, Downstream, Utilities, and Engineered Services, HydroChemPSC has the broadest industrial service line in the industry, bar none.

US Ecology, Inc. is a leading North American provider of environmental services to commercial and government entities. The Company addresses the complex waste management needs of its customers, offering treatment, disposal and recycling of hazardous and radioactive waste, as well as a wide range of complementary field and industrial services. US Ecology’s focus on safety, environmental compliance, and customer service,...

dClimate is a decentralized climate data marketplace and network designed to standardize, monetize, and distribute climate data, forecasts, and models. Its mission is to build an essential, immutable 'truth layer' for the Earth's climate record on the blockchain, empowering businesses, governments, and individuals to access reliable data to assess risks, monitor natural capital, and build lasting climate resilience.