Dungannon Water Hardness & Quality Report (2026)

NI Water (Northern Ireland Water) supplies Dungannon, the historic mid-Ulster market town in County Tyrone — a town with significant plantation-era heritage, the ancestral home of the O'Neill clan and site of the Dungannon Castle stronghold, now a thriving market and light industrial centre in the Mid Ulster District Council area — from Killylane Reservoir in the County Antrim upland catchment, treated at Killylane Water Treatment Works. At 97 mg/L (6.8°Clark), Dungannon's water is slightly hard — moderate for Northern Ireland, reflecting a modest calcium contribution from the Carboniferous (Dinantian) limestone geology that underlies parts of the mid-Tyrone supply catchment above the Lough Neagh basin.

Dungannon lies in mid-Ulster where NI Water supplies the Tyrone hinterland from Killylane Reservoir on the County Antrim basalt upland — a broadly impermeable Tertiary Basalt plateau that produces soft source water, with a modest calcium increment introduced in the distribution network from Carboniferous Limestone geological influence in the County Tyrone basin below. The result is 97 mg/L with TDS 196.6 mg/L — slightly hard water, broadly typical of the mid-Ulster NI Water distribution zone that includes Cookstown and the central Tyrone supply communities.

At 97 mg/L, limescale is a moderate and very manageable domestic concern in Dungannon. Descaling the kettle every six to eight weeks is typically adequate. The combi-boiler benefits from a standard scale inhibitor as a sensible precaution. Washing-up liquid lathers adequately at everyday quantities. Taps and shower heads develop light deposits over several weeks; a monthly wipe with white vinegar or a proprietary descaling product is adequate to keep fittings clean. The slightly hard mid-Ulster supply at Dungannon is comfortably within the moderate range for Northern Ireland and well below the hard water levels of much of south-east England.