Pasadena-based consulting firm Tetra Tech Inc. announced Sept. 29 that it has acquired Chantilly, Va.-based information technology services firm BlueWater Federal Solutions Inc. for an undisclosed sum.

BlueWater, which was founded in 2005, specializes in cybersecurity, mission-critical systems design and development and operation of federal enterprise systems for U.S. government clients, including the Federal Emergency Management Agency, Department of Energy and Department of Defense. The company has more than 350 employees.

Tetra Tech, which has roughly 20,000 employees, is an engineering and consulting firm that has in recent years made a big push into the high-margin field of information technology consulting, especially to federal government agencies.

“The addition of BlueWater builds on our strategy to grow our advanced analytics business with expanded capabilities in artificial intelligence, cybersecurity solutions, and mission-essential services for our U.S. federal customers,” Tetra Tech Chief Executive Dan Batrack said in a statement.

“Our ability to integrate high-end technology and analytics in the delivery of customized water, environment, and sustainable infrastructure solutions is a key differentiator for Tetra Tech in the marketplace today,” Batrack added.

Tetra Tech shares closed up 34 cents $94.97 a share on Sept. 29. The stock ticked up another 53 cents on Sept. 30, closing at $95.50.