ARRO Consulting, Inc. Email Format

Civil EngineeringPennsylvania, United States51-200 Employees

ARRO Consulting, Inc. is a mid-sized civil engineering and environmental consulting firm based in Lititz, Pennsylvania. It is headquartered in Lancaster County and serves the Mid-Atlantic region from 13 offices. For eight decades, the firm has delivered practical solutions across municipal engineering, water and wastewater systems, stormwater management, environmental compliance, geospatial analysis, planning, technology, and parks and recreation.

Its client base consists of municipalities and other public-sector entities that rely on technical excellence and long-term partnerships. In February 2026 ARRO announced the acquisition of Ott Consulting Inc., expanding its engineering and environmental consulting capabilities.

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