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Johnston Construction Company Design-Build Contractor

Letterkenny Elevated Water Tank more...

Little Patuxent Water Reclamation Plant: Treatment Improvements for Dreyer's Wastewater

Savage, Maryland ($10,135,000) more...

Wastewater Treatment Plant for the Hollywood Casino at Penn National

Grantville, Pennsylvania ($4,137,000) more...

6th Street Water Treatment Plant Design-Build

Harrisburg, Pennsylvania ($5,963,000) more...

Elk Neck State Park Wastewater Treatment Plant Design-Build

Cecil County, Maryland (Contract: $989,000) more...

Potomac Water Filtration Plant Chemical Feed Facilities Design-Build

Potomac, Maryland ($5,899,000) more...

Amber Meadows Pump Station Design-Build

City of Frederick, Maryland ($873,000) more...

Premier Environmental Contractor

Today's industry needs a competent, experienced construction company to assist with meeting existing and future infrastructure renovation and expansion. With both longtime and innovative construction expertise, Johnston Construction Company is eager to respond to client's needs. We have the resources and experience to handle a broad range of environmental construction projects using design-build, construction management at risk, or any of the traditional project delivery systems.

It is our goal at Johnston to provide our clients with high quality construction using professional expertise, superb craftsmanship, safe work practices, and exceptional teamwork; while maintaining a strong ethical conscience, being considerate of project economics and functional result, and always exploring new ways to improve our quality and productivity. [more]