| Business | Phone |
| Trc Intl Ltd 120 Se 6th Ave, Topeka 66603 | (785) 233-4552 |
| Bartlett & West Engineers Inc 1200 Sw Executive Dr, Topeka 66615 | (785) 272-2252 |
| Terracon Consultants Inc 3113 Sw Van Buren St, Topeka 66611 | (785) 267-3310 |
| Brack & Assoc Consulting 2953 Sw Wanamaker Dr, Topeka 66614 | (785) 271-6644 |
| C P Engineers & Land Surveyors 320 Sw 33rd St, Topeka 66611 | (785) 267-5071 |
| Camp Dresser Mc Kee Inc 534 S Kansas Ave, Topeka 66603 | (785) 235-3965 |
| Schmidt Engineering Co 3420 Sw Urish Rd, Topeka 66614 | (785) 478-4420 |
| Dalrymple Environmental Inc 7841 Sw 12th St, Topeka 66615 | (785) 273-0345 |
| Engineered Systems Solutions 4720 Nw 46th St, Topeka 66618 | (785) 286-4499 |
| Poe & Assoc 715 Sw Harrison St, Topeka 66603 | (785) 267-1414 |
| Proesse Inc 2730 Sw 57th St # 5, Topeka 66609 | (785) 234-5045 |
| Professional Engineering Con 1263 Sw Topeka Blvd, Topeka 66612 | (785) 233-8300 |
| Garver Engineers 517 Sw 37th St # A, Topeka 66611 | (785) 266-7933 |
| Geo Systems Kleinfelder 1601 Sw 41st St, Topeka 66609 | (785) 267-7131 |
| Hamman & Assoc 5759 Sw Woodbridge Dr, Topeka 66606 | (785) 272-2870 |