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Hazen and Sawyer's focus on water, wastewater and solid waste solutions. The environmental engineering firm specializes in planning, designing, and constructing clean drinking water systems for public and private clients around the world. Specific areas of expertise include architectural design, aquatic sciences, biosolids management, buried infrastructure, odor control, resource economics, risk management, utility management services, and wastewater and stormwater collection. The employee-owned firm operates from some 25 offices throughout the eastern US and two international branch offices in South America.

HDR has left its mark on the US. HDR is an architecture, engineering, and consulting firm that specializes in projects including bridges, water- and wastewater-treatment plants, and hospitals. HDR also provides mechanical and plumbing services, construction and project management, and utilities planning. The group has completed projects throughout the US and in some 60 countries abroad and has more than 185 locations around the world. The employee-owned company was founded as Henningson Engineering in 1917 to build municipal plants in the rural Midwest.

Helix Electric has coiled itself around the very core of the electrical contracting business in the Southwest. One of the US's largest electrical contractors, the company focuses on design/build, engineering, and installation projects. Its services include electrical, fiber optic cable, energy management system, emergency power system, electric fence, and voltage substation and distribution system installation. The company and affiliate Helix Electric of Nevada have offices in Arizona, California and Nevada. It has a portfolio of public and private projects, including jobs at airports, civic centers, hospitals, prisons, senior living centers, casinos, hotels, water treatment plants, and movie theaters.

Henkels & McCoy (H&M),the firm provides engineering, construction, and network development services globally. H&M also installs aerial and underground electrical distribution systems, gas transmission lines, and fiber-optic networks on electric transmission towers or along railroad rights-of-way. It has some 80 offices throughout the US, as well as Canada and Mexico. John Henkels Jr. and John McCoy founded H&M in Philadelphia in 1923 as a tree-trimming and landscaping firm. Employees and the Henkels family own H&M.

High Tech Electric provides electrical contracting services for commercial and industrial projects including office, retail, municipal, entertainment, and utility facilities. Services include new construction, voice data and video communications, security and alarm systems, lighting protection, and electrical maintenance and troubleshooting. The company has offices in Sioux City and Des Moines, Iowa, and another in Pickstown, South Dakota. President Mark Pottebaum founded High Tech Electric, which he still owns, in 2001.

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