Health department licensing
Plumbing in Arkansas falls under the Arkansas Department of Health, whose Plumbing and Natural Gas Section licenses plumbers, natural gas installers and contractors and enforces the state plumbing and fuel gas codes. A gas water heater job touches both trades, so the installer should carry the matching state credentials. Larger cities such as Little Rock and Fayetteville issue their own permits, while rural work is often inspected through the state.
Soft lakes, hard wells
Central Arkansas Water serves the Little Rock area from Lake Maumelle and Lake Winona, both soft. Northwest Arkansas relies on Beaver Lake, treated by the Beaver Water District, and Fort Smith draws on Lake Fort Smith and Lee Creek. On soft supplies like these, anode rods wear faster than sediment builds. Rural wells in the Ozarks and the Delta can be much harder or carry iron. Arkansas labor rates are modest, with most gas tank swaps landing between about $1,200 and $2,600; the water heater replacement page walks through an Arkansas install.