Lawrence Water Hardness & Quality Report (2026)

Lawrence, Indiana, in Marion County northeast of Indianapolis — a major Indianapolis northeast suburban community (Consolidated City of Indianapolis), home of Fort Benjamin Harrison (now Fort Harrison State Park, a former US Army post), the Lawrence campus of Marian University, and a growing diverse northeast Indianapolis suburban city — draws its municipal water supply from Fall Creek (Geist Reservoir) and local aquifer sources via Citizens Energy Group (Indianapolis Water) distributed to Lawrence. Water hardness in Lawrence measures 166.5 mg/L — classified as hard.

Lawrence's hard supply reflects the Marion County Indiana calcareous glacial terrain. The Fall Creek watershed above Geist Reservoir drains: Marion County Wisconsin Age calcareous glacial till and outwash (Tinley and Valparaiso Moraine calcareous till — transported from the Michigan Basin Silurian–Devonian dolomite terrain by the Laurentide Ice Sheet Indiana Lobe); the Silurian Niagara Dolomite subcropping in the Indianapolis metro area (calcareous dolomite contributing dissolved calcium to the aquifer and surface water); and the Fall Creek Valley alluvial recharge. The Marion County calcareous glacial terrain and Silurian dolomite subcrop produce the hard 166.5 mg/L at Lawrence.

At 166.5 mg/L, Lawrence residents face regular hard water challenges. Scale deposits form on faucet aerators, showerheads, and appliances within weeks — monthly descaling with citric acid solution is standard maintenance. Citizens Energy Group consistently delivers water meeting all Indiana IDEM and EPA Safe Drinking Water Act requirements.