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Mass Timber & Net-Zero Energy Design Reflect OC San's Civic Values

The award-winning, sustainable design for Orange County Sanitation District prioritizes employee well-being and community stewardship.

OC San Headquarters

Mass Timber & Net-Zero Energy Design Reflect OC San's Civic Values

The award-winning, sustainable design for Orange County Sanitation District prioritizes employee well-being and community stewardship.

OC San Headquarters
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Who We Are

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No. 6, Engineering News-Record
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13K+ Employees
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200+ Offices Worldwide
About Us
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Addressing PFAS

Our experts are helping airports deal with the impacts of "forever chemicals" that have been in use for decades at their facilities.

PFAS at Airports
Employees in HDR's Walnut Creek office

Our Culture

We enable you to grow your talent and flourish — helping our clients to change the world for the better. 

Working at HDR