Hardness, nitrates, pH, sanitary compliance: the real tap water quality in Saint-Jean-d'Illac (soft water), with official Hub'Eau data updated monthly.
⚠ Non-compliance detectedTap water in Saint-Jean-d'Illac measures 14.5°f in Gironde — a soft level below the national average. No softener needed: soft water doesn't encourage scaling in pipes or heating elements. In practice, households use fewer descaling products and tap seals last longer than in hard water areas. Official sanitary tests report a non-compliance on at least one monitored parameter: see the details below.
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: ~£41/year
For 2 persons, water at 14.5°f deposits around 0.7 kg of limescale per year in your appliances. Estimated cost in descalers, salt and filters.
Calcium: ~23 mg per litre
Your water provides 23 mg of calcium/L, which is 2% of the recommended daily intake.
Filtration not required
Your soft water does not require filtration. A jug filter remains useful for taste.
Drinking water in Saint-Jean-d'Illac, in the Gironde department is managed by saur france, which handles production, treatment and distribution of tap water in the municipality. The last available official sanitary analysis for Saint-Jean-d'Illac dates from 12 June 2026.
Compare the water quality in Saint-Jean-d'Illac with any other city available on the site.
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How does Saint-Jean-d'Illac compare to the 120 cities in the Gironde department and the 4806 largest cities in France in our database, on key water quality indicators.
Comparison based on 120 cities in Gironde department and the 4806 largest cities in France in our database.
Top 10 cities in the Gironde department ranked by tap water quality in our database.
Saint-Jean-d'Illac ranks 56th out of 120 cities in the department in our database.
Tap water in Saint-Jean-d'Illac has a quality index of 7.1/10 (good 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-Jean-d'Illac is 14.5°f (French degrees), making it soft water. The average is 17.8°f in the Gironde department and 22.1°f across our entire database.
Little. At 14.5°f, water in Saint-Jean-d'Illac is soft: limescale deposits remain limited on taps, shower walls and heating appliances.
No. With soft water (14.5°f), a softener would bring nothing: limescale isn't the issue in Saint-Jean-d'Illac.
The last available official sanitary analysis (12 June 2026) reports a non-compliance on at least one parameter. Official conclusion: "Eau d'alimentation conforme aux exigences de qualité en vigueur pour l'ensemble des paramètres mesurés." The affected parameter and any usage restrictions are in the official report: contact your water distributor or regional health agency (ARS) for details.
The pH measured in Saint-Jean-d'Illac is 7.8. Regulations require a value between 6.5 and 9: the water is within this range.
Compare tap water quality in other cities of the Gironde 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.