Hardness, nitrates, pH, sanitary compliance: the real tap water quality in Colmar (hard water), with official Hub'Eau data updated monthly.
✓ Compliant with sanitary standardsIn Colmar, water hardness at 30.6°f indicates hard water, typical of French limestone areas. Scale quickly forms in pipes, showerheads and thermal appliances, reducing their efficiency and lifespan. Hard water is not a health risk; equipment wear and increased household product consumption are the main downsides. Official sanitary tests declare it compliant with current standards across all monitored parameters.
Results from the latest official sanitary samples (Hub’Eau, French Ministry of Health). Click a card to understand what each parameter measures.
Sanitary compliance summarises adherence to French regulatory limits across all analysed parameters (bacteriology, chemistry, radioactivity). Compliant water can be consumed directly from the tap without additional treatment.
The TH (titre hydrotimétrique) measures calcium and magnesium concentration, expressed in French degrees (°f). The higher it is, the harder the water and the faster limescale deposits on surfaces and in appliances.
Nitrates come mainly from agriculture and waste water. The French regulatory limit is 50 mg/L; below 25 mg/L, the level is considered low.
PFAS are persistent chemical compounds, sometimes called "forever chemicals", used in industry. The vigilance threshold used here is 0.1 µg/L, consistent with current health recommendations.
pH measures water acidity. Regulations require a value between 6.5 and 9: outside this range, water may encourage pipe corrosion or affect taste.
Free chlorine is added to disinfect water and prevent bacterial growth in the distribution network. High levels can produce a perceptible taste or odour, without health risk at authorised levels.
Turbidity measures water clarity, in NTU (nephelometric turbidity units). A low value indicates clear water with few suspended particles.
Conductivity reflects overall water mineralisation, in µS/cm. It has no strict sanitary threshold but indicates the dissolved mineral salt content.
Maintenance budget: ~£86/year
For 2 persons, water at 30.6°f deposits around 1.5 kg of limescale per year in your appliances. Estimated cost in descalers, salt and filters.
Calcium: ~49 mg per litre
Your water provides 49 mg of calcium/L, which is 5% of the recommended daily intake.
Filter jug: cartridge every 4 months
At 30.6°f, replace the cartridge every 4 months. An under-sink filter lasts 6 to 12 months.
Drinking water in Colmar, in the Haut-Rhin department is managed by colmarienne des eaux, which handles production, treatment and distribution of tap water in the municipality. The last available official sanitary analysis for Colmar dates from 30 June 2026.
Compare the water quality in Colmar with any other city available on the site.
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How does Colmar compare to the 58 cities in the Haut-Rhin department and the 4806 largest cities in France in our database, on key water quality indicators.
Comparison based on 58 cities in Haut-Rhin department and the 4806 largest cities in France in our database.
Top 10 cities in the Haut-Rhin department ranked by tap water quality in our database.
Colmar ranks 45th out of 58 cities in the department in our database.
Tap water in Colmar has a quality index of 5.7/10 (average quality) in our database, calculated on nitrates, PFAS, pH, free chlorine and turbidity. This is a comparative reading of Hub'Eau data, not an official rating.
Tap water hardness in Colmar is 30.6°f (French degrees), making it hard water. The average is 19.7°f in the Haut-Rhin department and 22.1°f across our entire database.
Yes. At 30.6°f, water in Colmar is hard: limescale deposits quickly on taps, shower walls and heating appliances.
It may be justified. At 30.6°f, water in Colmar is hard: a softener limits scale build-up in pipes and heating appliances, worth comparing with simple antiscale maintenance depending on daily inconvenience.
Yes. In the last available official sanitary analysis (30 June 2026), water distributed in Colmar was declared compliant, meaning it can be drunk directly from the tap. This is a point-in-time sample, not real-time monitoring.
The pH measured in Colmar is 7.4. Regulations require a value between 6.5 and 9: the water is within this range.
Compare tap water quality in other cities of the Haut-Rhin department, ranked by quality index.
Methodology: the quality index compares each city against the 4806 other cities in our database on 5 parameters (nitrates, PFAS, pH, free chlorine, turbidity) and averages its relative position on each. This is not an official rating, only a simplified comparative reading of Hub’Eau data.