Harrisburg Skelly and Loy

The Harrisburg team, operating as Skelly and Loy Inc., A Terracon Company, has provided engineering and environmental services in Eastern and Central Pennsylvania to public and private sector clients since 1969. With a focus on client service and a reputation based on delivering excellent professional services, we combine our extensive local knowledge with nationwide expertise, data, and resources. We support clients with engineering and environmental consulting services in sectors ranging from transportation to mining, power generation and transmission to civil and public works, and bring a deep knowledge to each of these unique projects and their challenges.

Our Focus

We’re proud of our reputation as one of Pennsylvania’s best environmental firms and back that up with our broad range of environmental services by experienced professionals. Our team’s expertise encompasses a diversity of environmental niche services including:

• National Environmental Policy Act (NEPA) compliance
• Natural Resource Management (Wetlands, Streams, T&E)
• Threatened and Endangered Species (T&E)
• Section 404-401 Water and NPDES Permitting
• Natural Stream Design Engineering, Floodplain Management, and Sustainability
• Municipal Separate Storm Sewer Systems (MS4)
• Stormwater Management / Engineering Design and Compliance Management
• Water, Wastewater, and Remediation Treatment Systems Engineering and Licensed Operations
• Archaeology and Cultural Resources
• Noise and Air Quality Investigations
• Hazardous Waste Management Investigations and Remedial Design
• Industrial Hygiene Studies
• Asbestos
• Environmental Due Diligence
• Geographic Information Systems (GIS)

As trends change and new markets emerge, we assess and expand our strong foundation to provide professional services best suited to meeting the needs of our ever-changing world. 

We staff each project with team members who encompass the full range of expertise required to analyze each challenge and provide the best practical solution. We’re proud to help bring safety, quality, and innovation to critical infrastructure developments like the Central Susquehanna Valley Transportation (CSVT) project.

About Us

We support each other professionally and personally and work hard to create a family-friendly environment. The relationships we have built with our clients and colleagues are at the heart of what we do and how we work. When you join Terracon, we commit to mentoring you and giving you the tools to succeed. Our community outreach committee helps the office connect and support local charities like the Jared Box Project and the Adopt-A-Highway program. Our TerraFUN committee coordinates “Cheers for Peers,” our quarterly themed parties to celebrate staff anniversaries, 

Contact us today to explore how we can work together to achieve your goals.