Connect with us.
Since our founding in 1984, Trihydro has grown into a team of more than 600 professionals, with offices spanning the country. Our success stems from a shared commitment to safety, quality, and responsiveness—principles that have guided us from the beginning and continue to shape how we work today.
Consistently recognized as one of the nation’s top environmental firms, we are proud of the reputation we’ve built. Our growth hasn’t changed our values—it’s strengthened them. With every project, we deliver practical, forward-thinking solutions while strengthening trusted relationships with our clients and communities. At Trihydro, we believe success isn’t just measured by numbers or rankings, but by the trust we earn and the impact we make.
Where you will find us.
ALASKA
312 Tyee Street
Soldotna, AK 99669
ARIZONA
7310 N. 16th Street, Suite 310
Phoenix, AZ 85020
CALIFORNIA
645 7th Street
Arcata, CA 95521
916-367-5111
2520 Stanwell Drive, Suite 105
Concord, CA 94520
925-270-4674
9083 Foothills Boulevard, Suite 370
Roseville, CA 95747
916-367-5111
142 Cross Street, Suite 200
San Luis Obispo, CA 93401
805-329-3482
2501 Cherry Avenue, Suite 200
Signal Hill, CA 90755
562-453-3536
COLORADO
1601 Prospect Park Way, Suite 100
Fort Collins, CO 80525
1536 Cole Boulevard, Building 4, Suite 140
Lakewood, CO 80401
ILLINOIS
51 W. Jackson Street, Suite 130
Joliet, IL 60432
815-331-1091
MONTANA
406 E. Park Avenue
Anaconda, MT 59711
406-200-8795
100 Emerald Drive, Suite 3
Billings, MT 59105
406-831-6827
130 N. Main Street, Suite 108
Butte, MT 59701
406-200-8795
2707 Broadwater Avenue
Helena, MT 59602
406-558-4180
NORTH DAKOTA
830 E. Century Avenue, Suite 7
Bismarck, ND 58503
701-204-0065
OHIO
4650 Montgomery Rd., Suite 150
Cincinnati, OH 45212
513-429-7470
OKLAHOMA
8504 N. 128th E Avenue A
Owasso, OK 74055
539-208-8001
TEXAS
5508 Highway 290 W., Suite 201
Austin, TX 78735
1672 Independence Drive, Suite 315
New Braunfels, TX 78132
UTAH
6415 South 3000 East, Suite 230
Salt Lake City, UT 84121
WYOMING
707 W. 1st Street
Casper, WY 82601
114 E. 7th Avenue, Suite 100
Cheyenne, WY 82001
388 Main Street, Suite C
Lander, WY 82520
1252 Commerce Drive
Laramie, WY 82070
860 Powerhouse Drive, Unit 107
Rock Springs, WY 82901
2687 Aero Loop
Sheridan, WY 82801
Contact us to get started.
Where we work and play.
As our business has grown, we have expanded to 24 states across the country, from Alaska to Florida. Lucky for you, that means plenty of opportunities to get outside and enjoy the communities where we work.
Delve in with us
Delve is where regulatory insights meet hands on learning–webinars, trainings, technical articles and more.