Please allow us to introduce ourselves.

After More than 8,000 installations in 100+ countries, serving 400 million people, we are just getting started.

EDI was founded in 1975 to foster mutually supportive, long-term relationships as the industry’s most respected aeration company, helping our clients realize their facility’s full potential through our innovative technologies, services, and expertise. With our vast experience in supporting the aeration demands of many biological processes, EDI offers diffusers and complete advanced solutions for all types of biological reactors.

As part of our Aeration for life promise, EDI delivers:

Aeration system solutions for new plant construction and existing facility upgrades: We specialize in the development and application of advanced aeration technologies, creating biological treatment solutions for municipal and industrial wastewater. The professionals and engineers at EDI provide the highest level of value-added service, technology transfer, process application, and system design support. EDI is a full-service organization and provides field contract services for equipment installation, start-up, and maintenance with demonstrated success in more than 7,000 installations in over 100 countries worldwide.

Superior services, including parts and services for all brands: Our Diffuser Express division offers a large inventory of diffuser and waste treatment products for facility upgrades and replacement parts for all brands. Meanwhile, SiteWorks has qualified and experienced infrastructure support teams to provide single-source responsibility for installation, refurbishment, long-term preventative maintenance, and subcontracted supervisory services. Partnerships with design-build contractors are also managed through SiteWorks.

Advanced solutions that make a difference in the water reclamation industry: Our innovative and dynamic approach to problem-solving and customer service allows us to stand above the rest. We strive every day to live up to our historic status as a visionary leader in the industry by continuing to develop new technologies and solutions and improve current offerings.

Industry excellence: EDI has been recognized for excellence in exports and has received numerous awards including the State of Missouri’s “Small Business Exporter of the Year” Award, the U.S. Department of Commerce’s “President’s ‘E’ Award for Excellence,” or “E-Star” award. This E-Star award has only been granted to a select 300 companies since the inception of the program by President John F. Kennedy in 1961.

In June 2020, EDI integrated with Nexom after having been acquired by KKR and XPV Water Partners. This enables EDI to hold a much stronger position in the market with enhanced, synergistic capabilities and a wider range of solutions in our integrated portfolio of biological treatment and filtration technologies. Together with Nexom, our vision is for every drop of wastewater to meet the highest nutrient standards at the lowest possible energy footprint.


Our story dates back as far as 1975...

…when Environmental Dynamics International (EDI) is founded by Charles E. Tharp, a Columbia, Missouri-based company that quickly becomes a global competitor in biological wastewater treatment and advanced diffused aeration systems for municipal and industrial clients.

In 1999, EDI's Parts Division, Diffuser Express was launched

For customers that need direct delivery of aeration parts without any engineering, design, or installation services; EDI offers express delivery of diffusers, membranes, and specialty diffuser items through ‘DiffuserExpress’ (DX). Customers can find compatible parts for all brands whenever they need and experience worry-free aeration in their new and existing water and wastewater treatment applications. DX offers high-quality equipment for specific applications made and continuously improved with EDI’s aeration expertise, application knowledge, and in-house research and development.

The origin of today's SiteWorks Installation & Service team dates back to 2008

EDI established the contract services installation division in 2008 that currently operates as SiteWorks™.  Experienced SiteWorks™ field service professionals are experts at installation and maintenance of aeration systems. SiteWorks provides system operators a source for fast, reliable installation and maintenance. Across North America, you can have SiteWorks install your brand-new aeration system, as well as upgrade and maintain your age-old existing system from another brand, and anything in between.

In 2020, EDI joins the Axius Water Platform.

With the acquisition of EDI by Axius Water and its integration into Nexom, EDI continues to offer “aeration for life” through its engineered aeration technologies, and the combination of the two comapnies instantly creates a globally-competitive nutrient management leader offering an ever-broadening range of category-leading technologies. Axius Water, as it is now known, was created to address United Nations Sustainable Development Goal #6 by addressing the global wastewater nutrient crisis.

Innovation Continues...

As one of the largest Aeration System suppliers in the USA and a major global vendor, EDI continues to bring new aeration solutions to the market. In 2022, EDI’s premium FlexAir product line was relaunched as FlexAIR PRO™ and a FlexAIR BASIC™ line was introduced that conforms to the most common aeration specification that call for solvent welded 9-inch disc diffusers with a quality, American-made product.

Our Leadership Team
Meet the team that sets the tone.
Martin Hildebrand, P.Eng.

Martin Hildebrand, P.Eng.


Martin Hildebrand, P.Eng, started Nexom’s founding predecessor, Nelson Environmental, in 1997, and in the subsequent years has focused on guiding the company to pioneer numerous leading biological and filtration-based wastewater treatment systems. That experience includes research and wastewater technology development as well as process design and optimization of over 700 projects across North America and the Middle East.

Mona Colburn

Mona Colburn

Vice President, Finance

Mona Colburn joined Nexom’s finance and accounting team in 2008, and by 2013 she was leading it. She has has been a key contributor to a variety of acquisitions while overseeing successful reporting, audit, forecasting and cash management amidst the 4x+ organic growth of Nexom’s core business. Ms. Colburn holds her Bachelor of Commerce degree with a Major in Accounting, and leads both the Nexom and EDI teams with a current focus on understanding challenges and providing process-driven solutions that drive profitable growth.

Carlos Rios

Carlos Rios

Vice President, Global Data, Analytics, and International Sales

Carlos Rios Cavazos leads EDI and Nexom’s international sales teams while driving the company’s efforts to leverage data and analytics in providing support to consultants, municipalities and industries that are looking for proven and cost-effective biological, filtration, or aeration solutions for wastewater treatment. Carlos is a Chemical Engineering graduate from the Universidad Nacional Autónoma de México (UNAM) of México City, with 18 years of experience in the water and wastewater treatment industry. He has worked on the development of municipal and industrial projects (DBOT) for potable water and wastewater treatment plants and he previously managed the Global Sales Team of EDI focused on driving strategies to achieve corporate growth.

Our Platform

EDI is part of the Axius Water family of companies, a water quality-focused platform led by CEO Chris McIntire and formed by KKR’s Global Impact Fund and XPV Water Partners.

For more information, visit


ESG (Environmental, Social, and Governance)

In addition to Axius Water’s position at the forefront of addressing UN Sustainable Development Goal 6 (specifically Target 6.3), the platform’s stakeholders are counting on it to demonstrate excellence and transparency across all ESG issues.

To learn more about [brand]’s efforts through 2021, and its commitment to make a collective sustainability impact across environmental, social, and governance issues, visit our ESG landing page.


People Served Worldwide

Countries with Running Systems

Proud Water Environment Federation (WEF) member