Ohio Rev. Code Ann. § 4933.22

No person shall maliciously open, close, adjust, or interfere with a fire hydrant, valve, regulator, gauge, gate, disc, curb cock, stopcock, meter, or other regulator, operating or measuring device, or appliance in or attached to the wells, tanks, reservoirs, conduits, pipes, mains, service pipes, house pipes, or other pipes or apparatus of a water company or furnisher of water, with intent to cause the escape of water or to injure or destroy such property. No person shall tap, sever, open, or make unauthorized connections with a main or pipe used or intended for the transmission of water. This section does not apply to the agent or employee for that purpose, of the owner or operator of the appliances referred to in this section, and does not apply to anything done by or under authority of any regularly constituted fire department.