Newry Water Hardness & Quality Report (2026)

Newry, the city at the foot of the Mourne Mountains at the south Armagh–Down border on the Newry River–Canal corridor, is supplied by NI Water. The main source for the Newry area is Camlough Lake impounded at Camlough Mountain above Meigh in south Armagh, supplemented by the Fofanny Reservoir on the Mourne uplands north-east of Newry. The Camlough catchment drains the rugged south Armagh hill country — an area underlain by Silurian greywacke and shale of the South Armagh Hills, with some Carboniferous limestone outcrops in the drumlin lowlands south of Newry. Water is treated at Fofanny Water Treatment Works before distribution to Newry City and the surrounding area. The hardness of 158.5 mg/L is somewhat elevated for a reservoir supply, likely reflecting some Carboniferous limestone groundwater blending in the south Armagh supply zone.

The Silurian greywackes and slates of south Armagh yield soft to moderately soft runoff on their own, but the Carboniferous limestone drumlin country around Crossmaglen and south County Armagh contributes harder groundwater where distribution networks extend into these areas. The TDS of 379 mg/L is elevated relative to a pure Silurian catchment supply, pointing to calcium and sulphate contributions from Carboniferous limestone and the lower catchment geology. This makes Newry's water notably harder than other NI Water towns served primarily from Mourne granite catchments.

At 158.5 mg/L Newry's water is moderately hard and limescale management is a regular household task. Kettles should be descaled every five to six weeks using a citric acid descaler. Shower heads and tap aerators benefit from monthly soaking in white vinegar to clear mineral deposits. Washing-up liquid lathers reasonably well. Combi-boilers and white goods face moderate scaling risk and benefit from inline scale inhibitor protection. Newry's strategic position as a border city and its medieval canal heritage are well known; its moderately hard water supply reflects the complex mixed geology of the south Armagh and Mourne upland catchments.