Newtownards Water Hardness & Quality Report (2026)
Water Hardness
10.9°Clark15.5°fH8.7°dH
Source
reservoir
pH Level
8
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
367.6 mg/L
Est. Daily Cost
£0.35
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 Newtownards, your appliances are currently losing 21% efficiency due to mineral buildup.
| Appliance | In Newtownards | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.5 yrs | 8.5 yrs | -47% |
| Washing Machine | 7.9 yrs | 12 yrs | -34% |
| Water Heater | 9.4 yrs | 15 yrs | -37% |
Regional Water Comparison
How Newtownards compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Newtownards, Northern Ireland | 155 mg/L | 10.9° | 🟠 Hard | reservoir |
| Bangor, Northern Ireland | 123.5 mg/L | 8.7° | 🟠 Hard | reservoir |
| Dundonald, Northern Ireland | 98 mg/L | 6.9° | 🟡 Moderately Hard | reservoir |
| Holywood, Northern Ireland | 154.5 mg/L | 10.8° | 🟠 Hard | reservoir |
| Carrickfergus, Northern Ireland | 116.5 mg/L | 8.2° | 🟡 Moderately Hard | reservoir |
National Benchmark
How Newtownards compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Newtownards | 155 mg/L | 🟠 Moderate |
| United Kingdom National Avg | 183 mg/L | 🔴 High |
| Livingston Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Newtownards's Water Unique?
Local geology and source profile
Newtownards, the County Down market town at the head of Strangford Lough on the Ards Peninsula, is served by NI Water. The primary supply for the north Down and Ards district comes from Silent Valley Reservoir and Ben Crom Reservoir impounded in the Mourne Mountains — a granite-dominated upland area in south County Down that yields clean, soft rainfall runoff. This supply is treated at Knockbracken Water Treatment Works near Belfast before distribution around Belfast Lough. Newtownards' hardness of 155 mg/L is somewhat elevated compared with the raw Mourne granite reservoir water, reflecting groundwater contributions from Silurian greywacke and limestone outcrops in the Ards Peninsula hinterland and additional mineral pickup within the east Down distribution network.
The Silurian greywacke and shale of the Ards Peninsula forms the bedrock beneath Newtownards and the Strangford Lough lowlands, with scattered limestone and calcareous mudstone horizons within the Silurian sequence that can contribute modest calcium bicarbonate to local groundwater. Where distribution blending incorporates some local groundwater alongside the softer Mourne Mountain supply, hardness rises toward the 150–160 mg/L range. The TDS of 367.6 mg/L is elevated for this hardness level, consistent with a mixed reservoir–groundwater supply carrying sulphate from deeper geological sources.
At 155 mg/L Newtownards' water is moderately hard and limescale management is a regular but not excessive household task. Kettles should be descaled every five to six weeks — a standard citric acid kettle descaler works well. Shower screens and tap aerators benefit from monthly cleaning with white vinegar. Washing-up liquid lathers reasonably. Combi-boilers and washing machines face moderate scaling risk and benefit from inline scale inhibitor treatment. NI Water's consistent supply from the Mourne Mountains ensures reliable quality year-round, and Newtownards residents can manage limescale effectively with routine descaling habits.
Geology & Source: Supplied by NI Water from Silent Valley Reservoir in the Mourne Mountains and distribution blending from the Ards Peninsula supply zone — upland reservoir with local groundwater contribution — produces moderately hard water at 155 mg/L (10.9°Clark).