Cambridge Water Hardness & Quality Report (2026)

Cambridge, Ohio, in Guernsey County — the Guernsey County seat adjacent to Byesville and Caldwell on Wills Creek in east-central Ohio — receives its water from the City of Cambridge Water Department, drawing from the Wills Creek reservoir through the east-central Ohio distribution.

The very hard 219.5 mg/L hardness and TDS of 526.2 mg/L reflect the Guernsey County supply's very hard Appalachian Plateau character — the Pennsylvanian Allegheny Formation and Mississippian Maxville Limestone are slightly calcareous-calcareous formations in the east Ohio Appalachian Plateau; the Wills Creek supply acquires substantial dissolved mineral content from its extensive limestone and coal drainage (compare Byesville OH: 215/516 in Guernsey County comparable; Caldwell OH: 223/536 in Noble County comparable; Cambridge consistent very hard from the same Guernsey County Wills Creek Mississippian calcareous supply). The Wills Creek watershed — Pennsylvanian Allegheny Formation (slightly calcareous — secondary contributor), Mississippian Maxville Limestone (calcareous — primary hardness contributor), and Quaternary Wills Creek alluvium (calcareous — TDS contributor).

At 219.5 mg/L with TDS 526, Cambridge's water is very hard — a water softener is strongly recommended to protect plumbing and appliances. The PFAS level of 8.6 ppt warrants a certified drinking water filter. Review the City of Cambridge's annual water quality report.