Our Foundation is Built on Integrity and Reliability.

We are engineers and consultants. That’s the short and simple of who we are. But our real story goes much deeper.

For nearly 80 years, ARRO has taken pride in delivering smart, practical solutions for water, wastewater, planning, environmental compliance, GIS, parks and recreation, and more. Our clients count on us not just for technical expertise, but for clarity, consistency, and long-term commitment to their success.

We understand that clients don't just need technical answers; they need a trusted partner. A partner who sees the big picture, understands the details, and stays with them through every phase of the project—and beyond. Whether you’re leading a municipality, managing a utility, or overseeing complex infrastructure for an organization or community, you’re balancing limited resources, evolving needs, and rising expectations. Our aim at ARRO is to make that burden lighter.

Because good engineering is about more than just design. It’s about collaboration, trust, foresight, and making your job easier.

That’s our approach at ARRO. Our brand of engineering is built on our love for the profession, our dedication to our clients, and our drive to strengthen the environment and the communities we serve.

ARRO Consulting, Inc. (ARRO) traces its roots to 1946 when two separate organizations, Henry F. Huth and the Environmental Division of Gilbert Associates, Inc., were established. Both grew along similar paths in their respective regions of Pennsylvania as they consistently demonstrated responsiveness to their clients’ needs. Their successors became attractive investments for firms looking to expand. Philadelphia Suburban Corporation acquired the Environmental Division of Gilbert in 1982 and Huth in 1988.

The successors merged in 1989 to form PSC Engineers & Consultants, Inc. The trend continued, as PSC became Acer Engineers & Consultants in 1993 and Hyder Consulting, Inc. in 1999. ARRO became an employee-owned firm in 2001 following the purchase of Hyder’s U.S.-based business by the senior management team. Today we are a thriving investor-owned company.

Throughout its evolution, one remarkable fact remains unchanged – ARRO relishes a client base that trusts and understands the ARRO advantage. More than 80 percent of ARRO’s work comes from repeat business. ARRO’s positive work environment is fueled by teamwork coupled with attentiveness to technical accuracy. Our commitment to client satisfaction is second to none.

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