Water Score Luxembourg
Water quality in Mersch: 21°fH
Historical reference : Network hardness: 21°fH · hard water
Water quality varies from one zone to another. In Mersch, the network water has a reference hardness of 21°fH (hard water) — about 1,8 times the comfort reference threshold (12°fH).
The scale and calculator use this website’s historical reference hardness. Dated measurements appear below, separately for each supply network.
Laboratory reports
Your water analysis results
The latest available values for each supply network, with the sampling date of every measurement.
AEP-509-90
| Parameter | Result | Sampled |
|---|---|---|
| Total hardness | 29 °f | |
| Carbonate hardness | 20 °f | |
| pH | 7.5 pH | |
| Conductivity at 20 °C | 515 µS/cm | |
| Calcium | 94 mg/L | |
| Magnesium | 13 mg/L | |
| Nitrates | 14 mg/L | |
| Sodium | 11 mg/L | |
| Sulphates | 57 mg/L | |
| Chlorides | 25 mg/L | |
| Potassium | 2 mg/L | |
| Ammonium | < 0.02 mg/L | |
| Nitrites | < 0.01 mg/L | |
| Turbidity | < 0.5 FNU | |
| Intestinal enterococci | < 1 CFU/100mL |
Source reports : AGE · 2025/3548.
AEP-509-111
| Parameter | Result | Sampled |
|---|---|---|
| Total hardness | 28 °f | Measurement over a year old |
| Carbonate hardness | 22 °f | Measurement over a year old |
| pH | 7.4 pH | Measurement over a year old |
| Conductivity at 20 °C | 504 µS/cm | Measurement over a year old |
| Calcium | 102 mg/L | Measurement over a year old |
| Magnesium | 6.2 mg/L | Measurement over a year old |
| Nitrates | 14 mg/L | Measurement over a year old |
| Sodium | 7 mg/L | Measurement over a year old |
| Sulphates | 50 mg/L | Measurement over a year old |
| Chlorides | 13 mg/L | Measurement over a year old |
| Potassium | < 2 mg/L | Measurement over a year old |
| Ammonium | < 0.02 mg/L | Measurement over a year old |
| Nitrites | < 0.01 mg/L | Measurement over a year old |
| Turbidity | < 0.5 FNU | Measurement over a year old |
| Intestinal enterococci | < 1 CFU/100mL | Measurement over a year old |
Source reports : AGE · 2025/2673.
Reports may cover only some parameters, so values shown may come from different samples. A « < » indicates a detection limit, not an exact concentration. Extraction checks are automated; they do not establish overall drinking-water compliance.
Municipality
Localities attached to the Mersch water zone
The localities below currently use the same reference hardness value as the Mersch zone.
View the drinking water analyses for the municipality of Mersch ↗What this means at home
Hard water isn't dangerous. It's just demanding.
Hardness measures the calcium and magnesium in water. At 21°fH, Mersch is above the comfort threshold (12°fH) — limescale builds up and shows in daily life.
Appliances
Limescale builds up in the water heater, washing machine and dishwasher, shortening their lifespan.
Fixtures
White deposits on taps, shower heads and glass — endless cleaning.
Soap & laundry
Soap lathers poorly, laundry comes out rougher, you need more product.
Taste & feel
Limescale shows in coffee, on skin and hair after showering.
Your water every day
Understand limescale at household level.
Select your home type and household size to explore the annual estimates associated with your local water hardness.
Your annual estimate
Potential limescale removed and estimated savings.
The calculation changes with local hardness and the selected household size. It uses a reference consumption of 135 litres per person per day.
Water heater and water-heating appliances
Soap, shampoo, laundry and detergents
Descaling products and routine cleaning
Wear, service calls and equipment life
Indicative estimate. The limescale figure is the CaCO₃ equivalent contained in the water used. Savings are shown as a range.
Frequently asked questions — water in Mersch
Is the tap water in Mersch drinkable?
Consult your municipality’s current analysis report for your supply zone or locality. Water hardness describes limescale and is not sufficient to establish the water’s compliance with health requirements.
Is the 21°fH value exact for my tap?
It's the official network value for your zone. The hardness at your tap may vary slightly depending on network blending and your building's plumbing.