Downpatrick Water Hardness & Quality Report (2026)
Water Hardness
7.9°Clark11.3°fH6.3°dH
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
238.3 mg/L
Est. Daily Cost
£0.26
energy & soap waste
Source: DWI Data Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Downpatrick, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Downpatrick | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.9 yrs | 8.5 yrs | -31% |
| Washing Machine | 9.4 yrs | 12 yrs | -22% |
| Water Heater | 11.1 yrs | 15 yrs | -26% |
Regional Water Comparison
How Downpatrick compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Downpatrick, Northern Ireland | 112.5 mg/L | 7.9° | 🟡 Moderately Hard | reservoir |
| Newtownards, Northern Ireland | 155 mg/L | 10.9° | 🟠 Hard | reservoir |
| Dundonald, Northern Ireland | 98 mg/L | 6.9° | 🟡 Moderately Hard | reservoir |
| Castlereagh, Northern Ireland | 110 mg/L | 7.7° | 🟡 Moderately Hard | reservoir |
| Holywood, Northern Ireland | 154.5 mg/L | 10.8° | 🟠 Hard | reservoir |
National Benchmark
How Downpatrick compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Downpatrick | 112.5 mg/L | 🟡 Low |
| United Kingdom National Avg | 183 mg/L | 🔴 High |
| Livingston Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Downpatrick's Water Unique?
Local geology and source profile
Northern Ireland Water supplies Downpatrick, the County Down town and seat of the Newry, Mourne and Down District Council — one of Ireland's most historically significant towns, claimed as the burial place of St Patrick (the Cathedral Church of the Holy Trinity stands on the hill over the ancient see), and a community at the heart of the gentle drumlin landscape of Co. Down south of Strangford Lough — from Silent Valley Reservoir in the Mourne Mountains of County Down, treated at Drumaroad Water Treatment Works. At 112.5 mg/L (7.9°Clark), Downpatrick's water is slightly hard — harder than the typical soft Mourne Mountain granite supply — reflecting calcium contributions from the Cretaceous Chalk (the Antrim Chalk that extends into north Co. Down) and Silurian calcareous greywacke that partially characterise the Co. Down upland geology around the Mournes.
Downpatrick lies in the Co. Down drumlin lowland where NI Water delivers Silent Valley Reservoir supply from the Mourne Mountains — primarily a Caledonian Granite catchment (soft) — through the Co. Down distribution network that crosses Silurian calcareous rocks and the northern fringe of the Cretaceous Chalk (White Limestone) of north Co. Down. The chalk and calcareous Silurian greywacke contribution elevates hardness to 112.5 mg/L with TDS 238.3 mg/L — slightly hard, predominantly carbonate (TDS/hardness 2.12) water, consistent with the Southern Water Co. Down distribution zone.
At 112.5 mg/L, limescale is a moderate and manageable domestic concern in Downpatrick. Descaling the kettle every six to eight weeks is typically adequate. The combi-boiler benefits from a standard scale inhibitor as a precaution. Washing-up liquid lathers adequately at everyday quantities. Taps and shower heads develop moderate deposits over several weeks; a monthly wipe with white vinegar keeps fixtures in good condition. Downpatrick's slightly hard supply carries a modest chalk contribution as befits the county that bears St Patrick's name and cross — gentle calcium from the ancient drumlin landscape enriching the water of Ireland's most sacred town.
Geology & Source: Supplied by Northern Ireland Water from Silent Valley Reservoir in the Mourne Mountains, County Down — treated at Drumaroad Water Treatment Works — produces slightly hard water at 112.5 mg/L (7.9°Clark).