| Building Environment Council of Ohio: A non-profit professional association interested in problems within buildings arising from pollutants in and immediately around buildings. |
| Division of Water - Ohio: Collects data on surface and ground water, produces maps, regulates construction of dams, operates canal systems, and administers floodplain management program. |
| Federal Valley Watershed Group: Works to restore and preserve water quality, environmental health, and recreation in the watershed. Calendar of events and list of projects. |
| Highest Named Summits of Ohio: List of summits with elevations above 1000 feet and locations. |
| Muskingum Watershed Conservancy District: A system of dams and reservoirs working as a network to provide flood protection and flood reduction for 18 Ohio counties. camp includes news and details about how the system works. |
| Office of Pollution Prevention: Provides a list of materials that are recycled, reclaimed or exchanged. Also includes links to lists of companies which recycle these materials |
| Ohio Division of Soil & Water Conservation: Provides information on county districts, watershed programs, education and calendar. |
| Ohio Environmental Protection Agency: Mission in to protect human health and the environment through responsible regulation. Site provides publications, calendar, and news releases. |
| Ohio Soil and Water Conservation Resources: Provides links to districts, organizations and projects in the state. |
| Ohio Statewide Environmental Network: Purpose is to formalize a network of existing Ohio technical assistance organizations and agencies so that they may better provide environmental assistance to small- and medium-sized manufactures. |
| Ohio Trees: Ohio State University provides information about trees in general, historic trees, identification key, and descriptions and images of common species in the state. |
| Ohio Wildlife Resources: Articles and notes on various species of animals in Ohio. |
| Ohio's Lake Erie Coastal Resources Inventory (LECRI): Provides a way to search for and discover useful information about Lake Erie, its coastal lands and watersheds, and the area's physical cultural, recreational and economic resources. |
| Ohio's Wildlife Areas: Wildlife maps of Ohio, divided by regions. |
| Ohioview: Promotes the low-cost distribution of US Government civilian satellite data for public use. |
| Planet Ohio WebRing: A ring of Ohio web sites on astronomy, birding, butterflies, gardening, herpetology, mycology, spiders, and wildflowers. |
| The Birds of Ohio: A checklist of Ohio bird species. |
| Watchable Wildlife Viewing Sites: A program designed to enhance wildlife viewing opportunities for the public across the state. Provides a listing of 80 sites throughout Ohio broken down into district divisions. |
| Where to Have Your Water Tested: State of Ohio list of approved testing laboratories. |
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