| 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. |
| 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 Environmental Protection Agency | | Mission in to protect human health and the environment through responsible regulation. Site provides publications, calendar, and news releases. |
| 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. |
| 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. |
| 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. |
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