| Business | Phone |
| Air Resources 156 S State St, Dover 19901 | (302) 739-4791 |
| Hazardous Waste 89 Kings Hwy, Dover 19901 | (302) 739-3689 |
| Natural Resources Dept 89 Kings Hwy, Dover 19901 | (302) 739-4403 |
| Soil & Water Div 89 Kings Hwy, Dover 19901 | (302) 739-4411 |
| Solid Waste Authority 1128 S Bradford St, Dover 19904 | (302) 739-5361 |
| Surface Water 89 Kings Hwy, Dover 19901 | (302) 739-5731 |
| Water Resources Div 89 Kings Hwy, Dover 19901 | (302) 739-4860 |