| Business | Phone |
| Landmark Environmental Assoc 300 S 2nd St, St Charles 63301 | (636) 443-0008 |
| Green Suites Intl 2345 Delaware Dr, St Charles 63303 | (636) 922-2285 |
| Gaines Soil Consulting St Charles 63301 | (636) 947-1221 |
| Envirogreen 230 Hawning Rd, St Charles 63301 | (636) 949-8733 |
| Environmental Management Corp 4933 Dwyer Rd, St Charles 63301 | (636) 250-4600 |