About EOSi

Empowering Clean Water® since 2003.

Environmental Operating Solutions, Inc. (EOSi) provides biological nutrient removal and chemical contaminant removal solutions, supplies, and technical services empowering water and wastewater treatment plant operators in their mission to deliver treated effluent water free of harmful nutrients and contaminants.

EOSi’s renewable and non-hazardous product chemistries, full-service process monitoring and control programs, and on-time delivery and no-disruption supply chain are backed by our world-class team of technical experts — each personally dedicated to protecting and preserving our global water resources by reducing the threat of biological nutrient and contaminant pollution.

Meet Our Leadership Team

Samuel ledwell

Samuel Ledwell


Joining EOSi at the company’s 2003 inception, Sam has more than two decades industry-leadership experience with biological contaminant removal technologies, products, and services, specifically focused on developing EOSi’s MicroC® product portfolio of carbon sources and Nitrack® equipment and services.

Jeff Prellberg Vice President Sales Marketing

Jeffrey Prellberg

Vice President, Sales & Marketing

Jeff brings more than 30 years of water/wastewater treatment industry experience, including senior positions as Director of Global Service and Aftermarket and VP Municipal Business Development with Trojan Technologies, a Danaher company providing water and wastewater treatment technology and service solutions, and as part of the senior management team for Danaher’s USP Technologies business.

Rob keeling Vice President Operations

Rob Keeling

Vice President, Operations

With more than 15 years of experience in supplier development, supply chain management, procurement, and operations, Rob manages EOSi’s global supplier development, raw material identification and procurement, risk management, rail-car fleet, inbound rail and truck logistics, and new manufacturing site development for our nationwide network of production facilities.

R Coleman

Ryan Coleman, P.E., LEED AP

Director, Process Solutions & Programs

A Professional Engineer registered in the state of Idaho, Ryan’s extensive wastewater operations and process knowledge includes hands-on experience in the protein industry, and managing industrial wastewater treatment plants for several companies in Colorado, Idaho, and Pennsylvania. Ryan led a series of BNR optimization initiatives successfully reducing effluent total nitrogen concentrations by more than 97 percent as Cargill, Inc.’s Environmental Manager, and managed construction and operation of facilities creating renewable clean energy from dairy waste.

Sandra clark

Sandra L. Clark

Director, Quality Management Systems

An ASQ Certified Manager of Quality and Organizational Excellence and ASQ Certified Quality Engineer, Sandra’s more than 25 years of quality management experience enables expanding and developing EOSi’s new quality processes to support product manufacturing, raw materials procurement, meeting and exceeding customer expectations, and creating value through company’s quality management system.

Michelle murray

Michelle Murray

Senior Accountant

With a dozen years of corporate accounting experience with EOSi, Design Mark Industries, and Calgreg Electronics, Michelle’s senior accountant responsibilities include spearheading annual audit and tax filing coordination with CPAs, creating specialized financial presentations, performing financial analysis, and compiling and presenting financial information for annual reports.