Hardness, nitrates, pH, sanitary compliance: the real tap water quality in Saint-Leu-la-Forêt (hard water), with official Hub'Eau data updated monthly.
✓ Compliant with sanitary standardsSaint-Leu-la-Forêt has particularly mineral-rich water: 25.4°f — a high level exceeding the national average. White deposits on stainless steel and chrome surfaces form quickly; bi-monthly descaling and regular filter maintenance are essential. The most effective long-term solution is installing a softener on the main water supply. 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.
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: ~£71/year
For 2 persons, water at 25.4°f deposits around 1.2 kg of limescale per year in your appliances. Estimated cost in descalers, salt and filters.
Calcium: ~41 mg per litre
Your water provides 41 mg of calcium/L, which is 4% of the recommended daily intake.
Filter jug: cartridge every 5 months
At 25.4°f, replace the cartridge every 5 months. An under-sink filter lasts 6 to 12 months.
Drinking water in Saint-Leu-la-Forêt, in the Val-d'Oise department is managed by franciliane de veolia, which handles production, treatment and distribution of tap water in the municipality. The last available official sanitary analysis for Saint-Leu-la-Forêt dates from 21 April 2026.
Compare the water quality in Saint-Leu-la-Forêt with any other city available on the site.
Type a city name to start the comparison.
How does Saint-Leu-la-Forêt compare to the 71 cities in the Val-d'Oise department and the 4806 largest cities in France in our database, on key water quality indicators.
Comparison based on 71 cities in Val-d'Oise department and the 4806 largest cities in France in our database.
Top 10 cities in the Val-d'Oise department ranked by tap water quality in our database.
Saint-Leu-la-Forêt ranks 37th out of 71 cities in the department in our database.
Tap water in Saint-Leu-la-Forêt has a quality index of 4.7/10 (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 Saint-Leu-la-Forêt is 25.4°f (French degrees), making it hard water. The average is 26°f in the Val-d'Oise department and 22.1°f across our entire database.
Yes. At 25.4°f, water in Saint-Leu-la-Forêt is hard: limescale deposits quickly on taps, shower walls and heating appliances.
It may be justified. At 25.4°f, water in Saint-Leu-la-Forêt 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 (21 April 2026), water distributed in Saint-Leu-la-Forêt was declared compliant, meaning it can be drunk directly from the tap. Official conclusion: "Eau d'alimentation conforme aux exigences de qualité en vigueur pour l'ensemble des paramètres mesurés." This is a point-in-time sample, not real-time monitoring.
The pH measured in Saint-Leu-la-Forêt is 7.7. Regulations require a value between 6.5 and 9: the water is within this range.
Compare tap water quality in other cities of the Val-d'Oise 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.