Castor Bay Portadown: your water explained
Published results for this named supply area. Your address may be served by a different area.
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Your water at a glance
Moderately hard water. Know your mineral level.
This figure helps you choose appliance settings. Hardness describes dissolved minerals and does not establish whether every water-quality requirement was met.
162.74 mg/l as CaCO₃
Soft ≤100 · Slightly hard ≤150 · Moderately hard ≤200 · Hard ≤300 · Very hard >300 mg/l. DWI hardness bands; not safety grades.
Published quality checks
More context is needed
These labels describe 2025. 1 other parameters have no complete compliance judgement here. They are not a guarantee about an individual tap today.
Understand the reported results ↓Make this useful for your home
Hardness reporting period: 2025 · Quality reporting period: 2025
Appliance settings · Convert hardness units
1.63 mmol/l
A conversion of the published hardness, not another test. Follow your appliance’s model-specific instructions.
Drinking-water results
What do the important results mean?
Read the status, sample range and source requirement together. A low average can hide an individual exceedance. Green labels mean the supplier reported no exceedances for that parameter and period; amber calls for source context.
Detailed quality results are not held here yet. Use the official supplier report for these questions.
For your household
What should you do next?
Check appliance settings
Match the hardness unit to your dishwasher manual. Settings depend on the model.
Dishwasher guideUnderstand treatment options
A filter and a softener do different jobs. Start with the household problem you want to solve.
Filters and limescaleA new change at your tap?
For a new taste, smell, colour or supply problem, check current supplier advice. Annual data is not a live incident feed.
Official supplier help ↗Taste, appearance and mineral content
Chlorine, pH and minerals answer different questions. Calcium and magnesium help describe hardness; chloride is different from treatment chlorine. None is a stand-alone water-quality score.
Calcium
A naturally occurring mineral that contributes to hardness. Calcium alone is not the same measurement as total hardness.
See the measurement and context ↓Has the hardness changed?
History for this reported source area. Only comparable annual statistics appear in the chart; rolling summaries are kept separate. These are not daily tests at your address.
2023
153.88 mg/l as CaCO₃
2025
162.74 mg/l as CaCO₃
Change between these editions
+8.86 mg/l as CaCO₃
Scroll the chart sideways on smaller screens, or read the values below. Vertical axis: hardness in mg/l as CaCO₃. Bars show annual means.
| Period | Mean | Sample range | Samples |
|---|---|---|---|
| 2023 | 153.88 | —–— | 8 |
| 2024 | 156.9 | —–— | 9 |
| 2025 | 162.74 | —–— | 8 |
Historical figures come from retained source copies. Supplier links may now open a newer edition. Ranges describe the samples reported, not confidence intervals. A short annual series supports a comparison; it does not establish a sustained trend or a change at your tap.
Explore all measurements · 4 parameters · 2025
Every result retains its original units, range, sample count and source notes. Comparisons use the reference printed in this report; qualitative references and missing limits are not converted into invented pass/fail judgements. Unlisted substances are not necessarily absent from the water.
Hardness and minerals 3 parameters
Total hardness
No numerical limit supplied
Published mean
162.74 mg/l as CaCO₃
Source reference: Not supplied
Dissolved calcium and magnesium affect limescale and appliance settings. This is a mineral description, not a safety score.
8 samples · Range: — to — mg/l as CaCO₃
This report gives no numerical limit for this parameter. A higher or lower number is not automatically better.
Original wording and source notes
Source reference: Not supplied. Source parameter: Total hardness. Original mean: 162.74 mg/l as CaCO₃.
Calcium
No numerical limit supplied
Published mean
50.38 mg/l
Source reference: Not supplied
A naturally occurring mineral that contributes to hardness. Calcium alone is not the same measurement as total hardness.
8 samples · Range: — to — mg/l
This report gives no numerical limit for this parameter. A higher or lower number is not automatically better.
Original wording and source notes
Source reference: Not supplied. Source parameter: Calcium. Original mean: 50.38 mg/l.
Magnesium
No numerical limit supplied
Published mean
8.83 mg/l
Source reference: Not supplied
A naturally occurring mineral that contributes to hardness alongside calcium.
8 samples · Range: — to — mg/l
This report gives no numerical limit for this parameter. A higher or lower number is not automatically better.
Original wording and source notes
Source reference: Not supplied. Source parameter: Magnesium. Original mean: 8.83 mg/l.
Other monitored substances 1 parameters
Potassium
No numerical limit supplied
Published mean
4.01 mg/l
Source reference: Not supplied
A substance monitored in this supplier report. The source reference, units, sample range and any reported failures provide its context; the number alone is not a water-quality rating.
8 samples · Range: — to — mg/l
This report gives no numerical limit for this parameter. A higher or lower number is not automatically better.
Original wording and source notes
Source reference: Not supplied. Source parameter: Potassium. Original mean: 4.01 mg/l.
Sources, dates and how to interpret this page
- Reporting period
- 2025
- Source retrieved
- 2026-09-06
- Last verified source check
- 2026-09-06
- Original publication
- Northern Ireland Water report ↗
NI Water publishes these annual water-supply-zone values under the Open Government Licence v3.0.
This extraction covers the hardness/mineral table, not the full water-quality register. Missing substances are not zero.
History follows the source zone code. Supply arrangements and zone names may change; a past zone result is not proof of the historical supply to your address.
WaterGrade uses the DWI hardness categories consistently; NI Water uses additional soft-water categories. Use your own appliance manual rather than the generic setting in the source table.
Hardness: 8 samples · reported range — to — mg/l as CaCO₃.
Status labels describe the published parameter and period. Historical exceedances do not automatically establish a current incident. Numerical limits are taken from the original report, not applied indiscriminately across countries, dates or sampling locations. DWI explains how standards work in England and Wales.
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