Carrickfergus Water Hardness & Quality Report (2026)
Water Hardness
~0–99 mg/L
Softestimated · not lab-verified
Source
reservoir
pH Level
7
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
7.5 mg/L
Est. Daily Cost
£0.11
energy & soap waste
Source: DWI Data Portal · Updated 2026
0–99
mg/L
Soft
100–149
mg/L
Slightly Hard
150–199
mg/L
Moderately Hard
200–300
mg/L
Hard
300+
mg/L
Very Hard
Appliance Damage Report
In Carrickfergus, your appliances are currently losing 7% efficiency due to mineral buildup.
| Appliance | In Carrickfergus | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.9 yrs | 8.5 yrs | -7% |
| Washing Machine | 11.2 yrs | 12 yrs | -7% |
| Water Heater | 14 yrs | 15 yrs | -7% |
Regional Water Comparison
How Carrickfergus compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Carrickfergus, Northern Ireland | ≈ 0–99 mg/L | 3.5° | 🟢 Soft | reservoir |
| Holywood, Northern Ireland | ≈ 0–100 mg/L | 10.8° | 🟢 Soft | reservoir |
| Newtownabbey, Northern Ireland | ≈ 200–300 mg/L | 10.9° | 🟠 Hard | reservoir |
| Dundonald, Northern Ireland | ≈ 0–100 mg/L | 6.9° | 🟢 Soft | reservoir |
| Larne, Northern Ireland | ≈ 0–100 mg/L | 4.2° | 🟢 Soft | reservoir |
National Benchmark
How Carrickfergus compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Carrickfergus | ≈ 0–99 mg/L | 🟢 None |
| United Kingdom National Avg | 177 mg/L | 🟡 Moderate |
| Skipton Top Rated | 7.1 mg/L | 🟢 None |
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What Makes Carrickfergus's Water Unique?
Local geology and source profile
Northern Ireland Water Limited supplies the area of Carrickfergus, located in County Antrim, drawing water from the Mourne Mountains watershed and local sources. The Dorisland Water Treatment Works in Carrickfergus treats water for approximately 30,000 customers, also serving Islandmagee, Newtownabbey, and north Belfast. This utility manages a substantial daily volume of clean water treatment and wastewater management across Northern Ireland, serving nearly 1.8 million people province-wide. The supply for Carrickfergus reflects a blend of water characteristics.
The geology beneath Carrickfergus is primarily composed of Paleozoic metamorphic and sedimentary rocks, with areas covered by Tertiary basalts. This varied geological foundation, characteristic of County Antrim, means the water's mineral content isn't uniform. The mixed geological substrate results in variable water chemistry across the service area, contributing to a blend of hard and soft water qualities reaching consumers' taps.
Homeowners may notice varying effects on plumbing and appliances depending on the specific water chemistry in their immediate vicinity. While no specific hardness levels were found, a mix of characteristics suggests potential for scale buildup in some areas, impacting the efficiency of water heaters and dishwashers. If you experience issues, running your tap water until it clears after maintenance is advised. Northern Ireland Water offers 24-hour customer support at 03457 440088 for any water quality concerns.
Geology & Source: Paleozoic metamorphic and sedimentary rocks with Tertiary basalts; mixed hard and soft water characteristics
Other Northern Ireland Water Reports
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