WSB LLC (“WSB”), one of the nation’s fastest-growing design and consulting firms, today announced the acquisition of Civil Infrastructure Associates, LLC (“CIA”), a well-established municipal engineering firm located in Tennessee, specializing in water and wastewater utilities, civil/site design, aviation infrastructure, and surveying services. WSB is a portfolio company of GHK Capital Partners LP (“GHK”), a leading middle-market private equity firm based in Greenwich, CT.

The acquisition of CIA strengthens WSB’s municipal engineering platform, expanding the firm’s ability to support public-sector clients facing complex infrastructure, regulatory, and growth-driven challenges. CIA brings deep expertise in water and wastewater utilities, civil/site design, aviation, surveying, GIS, and infrastructure funding assistance.

“The acquisition of CIA represents a strategic investment in the continued growth of WSB’s municipal engineering capabilities,” said Bret Weiss, WSB’s president and chief executive officer. “CIA is widely respected for its technical excellence, responsive client service, and community-centered approach to engineering. Their expertise complements our existing services and strengthens our ability to deliver integrated infrastructure solutions for our clients. Just as important, our two firms share a common set of values, collaboration, integrity, and a commitment to making a positive impact on the communities we serve.”

With this acquisition, WSB expands its multidisciplinary team while strengthening its presence in the Southeast. Today, WSB operates from more than 50 offices with approximately 1,800 employees nationwide, serving clients across government, commercial, and infrastructure markets.

“Joining WSB marks an exciting next chapter for CIA,” said Linda Sullivan, President of CIA. “From the beginning, CIA has believed that quality engineering, guided by strong human values, can make a meaningful difference in people’s lives. Partnering with WSB allows us to build on that foundation while offering our clients access to broader resources and integrated expertise. For our staff, this partnership creates new opportunities for growth, collaboration, and long-term career development within a like-minded organization.”

WSB and CIA will work together to integrate their services and develop a coordinated go‑to‑market approach in 2026. This marks WSB’s eighth acquisition in three years and further expands WSB’s expertise across water and wastewater utilities, civil/site design, aviation infrastructure, and surveying services.

About WSB

WSB is a forward-thinking design and consulting firm specializing in engineering, community planning, environmental, and construction services. Its staff improves the way people engage with communities, transportation, infrastructure, and the environment. To learn more, visit wsbeng.com.

About GHK Capital Partners LP

GHK is a leading middle-market private equity firm focused on making control investments in industrial companies across North America. For more information about GHK please visit www.ghk.com.

About Civil Infrastructure Associates, LLC (CIA)

Civil Infrastructure Associates, LLC is a municipal engineering firm founded in 2009 by Linda Sullivan. CIA specializes in water and wastewater utilities, civil/site design, aviation infrastructure, surveying, GIS, and infrastructure funding assistance. The firm is known for delivering big-firm capabilities with small-firm responsiveness to municipalities and public agencies.

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