Water hardness and tap water in Sindelfingen
Landkreis Böblingen, Baden-Württemberg · Postcode 71063, 71065, 71067, 71069
This page is a translation of the German version; the German page is authoritative. German version · Report a translation error
- Limits of the Drinking Water OrdinancemetAll tested parameters (21), at the waterworks
- Water hardness16.9 °dH, hardNo legal limit, only a range
- Data coverageCore parameters: 2 of 7Score provisional
Verified drinking-water values: water “Wasserwerk Floschen”
| Parameter | Value | Limit (TrinkwV) | Sampling date | Source | Status |
|---|---|---|---|---|---|
| Nitrate | 5.5 mg/L | 50 mg/L | 4 September 2025 | Stadtwerke Sindelfingen GmbH | verified |
| Uranium | 0.0013 mg/L | 0.01 mg/L | 4 September 2025 | Stadtwerke Sindelfingen GmbH | verified |
| Chloride | 12 mg/L | 250 mg/L | 4 September 2025 | Stadtwerke Sindelfingen GmbH | verified |
| Sulphate | 57 mg/L | 250 mg/L | 4 September 2025 | Stadtwerke Sindelfingen GmbH | verified |
| Sodium | 6.5 mg/L | 200 mg/L | 4 September 2025 | Stadtwerke Sindelfingen GmbH | verified |
| pH | 7.72 | 6.5–9.5 | 4 September 2025 | Stadtwerke Sindelfingen GmbH | verified |
| Total hardness | 16.9 °dH (hard) | no legal limit | 4 September 2025 | Stadtwerke Sindelfingen GmbH | verified |
| Electrical conductivity | 572 µS/cm | – | 4 September 2025 | Stadtwerke Sindelfingen GmbH | verified |
| Fluoride | 0.12 mg/L | 1.5 mg/L | 4 September 2025 | Stadtwerke Sindelfingen GmbH | verified |
Note from the test report (in the German original): Stadtwerke Sindelfingen · „Die Qualität des Sindelfinger Trinkwassers“, typische Analysewerte für Wasserwerk Floschen (Stand 04. September 2025). Diese Werte gelten laut Stadtwerken Sindelfingen Innenstadt sowie Süd-West, Hinterweil, Schleicher, Goldberg und Schwertstraße. Sindelfingen wird aus drei Wässern versorgt; wie viele Adressen jedes versorgt, veröffentlichen die Stadtwerke nicht. Calcium (71 mg/l) und Magnesium (16 mg/l) passen im Bericht nicht zur gedruckten Gesamthärte von 16,9 °dH (3,02 mmol/l); sie sind deshalb nicht übernommen. Die Werte gelten ab Wasserwerk.
Background on household plumbing, not a measurement: in Sindelfingen, 51 % of buildings with living space were built before 1970, and a further 13 % between 1970 and 1979 (Zensus 2022, Statistisches Bundesamt, dl-de/by-2-0). (Zensus 2022) According to the German Environment Agency (Umweltbundesamt), lead pipes exist at most in houses built before 1973 – and by no means in all of them. Whether there are any in your house is known to the owner or a plumber. (UBA)
What the values mean for Sindelfingen
- Nitrate 5.5 mg/L – about 11 % of the limit of 50 mg/L and in the unremarkable range. Boiling does not reduce nitrate.
- Uranium 1.3 µg/L – unremarkable against a limit of 10 µg/L. In some regions uranium occurs naturally from the rock (geogenic).
- pH 7.72 – within the range of the Drinking Water Ordinance (6.5 to 9.5). The pH determines how corrosive the water is in household plumbing.
Water hardness in Sindelfingen in everyday life
At 16.9 °dH, Sindelfingen is in the hardness range “hard” (soft: below 8.4 °dH, medium: 8.4–14 °dH, hard: above 14 °dH).
- Dose detergent for the hardness range “hard” – a larger amount is needed; a water softener for the washing machine can save detergent.
- Limescale builds up quickly: descale the kettle about every two to three weeks, and taps and shower heads too.
- In your own house, limescale protection or a water softener can be worthwhile at this hardness; in a rented flat, the owner decides.
Baby food and low sodium: tap water in Sindelfingen next to the bottled-water thresholds
Bottled water may only be labelled “suitable for preparing infant food” („geeignet für die Zubereitung von Säuglingsnahrung“) if it keeps to the maximum levels of the German Mineral and Table Water Ordinance (Mineral- und Tafelwasser-Verordnung, Annex 6). Here the published values for Sindelfingen are shown next to them, each substance on its own. This is a comparison with labelling thresholds for bottled water, not a statement on whether your tap water is suitable for baby food. (Min/TafelWV, Anlage 6)
| Substance | Maximum level | Value in Sindelfingen |
|---|---|---|
| Sodium | 20 mg/l | 6.5 mg/l – not above |
| Nitrate | 10 mg/l | 5.5 mg/l – not above |
| Nitrite | 0.02 mg/l | not in the report |
| Sulphate | 240 mg/l | 57 mg/l – not above |
| Fluoride | 0.7 mg/l | 0.12 mg/l – not above |
| Manganese | 0.05 mg/l | not in the report |
| Arsenic | 0.005 mg/l | not in the report |
| Uranium | 0.002 mg/l | 0.0013 mg/l – not above |
Against the other thresholds of Annex 6, the water would qualify as: low in sodium (“suitable for a low-sodium diet”) (Sodium 6.5 mg/l, threshold below 20 mg/l).
For context: the German Environment Agency (Umweltbundesamt) considers preparing baby food with bottled water carrying this label necessary only in rare cases, for example when tap water is temporarily allowed to contain more than 50 mg/l nitrate. (UBA 2016, p. 59) Water from lead pipes in the house is always unsuitable for infants. (UBA 2020, p. 16) The values apply at the waterworks. Questions about baby food are answered by your midwife, your paediatrician and the health office (Gesundheitsamt).
Frequently asked questions about tap water in Sindelfingen
Can you drink the tap water in Sindelfingen?
According to the verified values, yes: All tested parameters with a legal limit (21) meet the limits set by the German Drinking Water Ordinance (TrinkwV). WaterScore (provisional): 99.5 out of 100 – the test report contains only 2 of 7 core parameters. This applies to the water from the waterworks – restrictions can only arise from old household plumbing.
How hard is the water in Sindelfingen?
It depends on the address: Wasserwerk Floschen 16.9 °dH, Bodenseewasser (BWV) 9.11 °dH and Wasserwerk See 16.5 °dH. The waters are in different hardness ranges (“hard” and “medium”); detergent and descaler should follow the water at your address.
Is there PFAS in the tap water in Sindelfingen?
The published analysis by Stadtwerke Sindelfingen that we evaluated gives no PFAS value. This does not mean there is no PFAS in the water; there is simply no figure for it. Since 12 January 2026, a limit of 0.1 µg/l has applied to the sum of PFAS-20. The supplier can tell you whether PFAS was measured and with what result. For the other waters, the analyses give no PFAS value.
Do I need to filter my tap water in Sindelfingen?
Based on the verified supplier values, a filter is not necessary. It can make sense if you do not like the taste. If you suspect lead pipes in an old building, a filter does not help; a laboratory analysis at the tap does – that is a question of the household plumbing, not of the water leaving the works.
WaterScore
- Total (provisional)99.5 / 100
- Chemical safety100 / 100
- Heavy metals100 / 100
- Nutrients100 / 100
- General parameters100 / 100
- Data timeliness97.4 / 100
- Data quality100 / 100
Data coverage: 2 of 7 core parameters. Not in the test report: Nitrite, Lead, Copper, Arsenic and PFAS (sum). Missing parameters are neither estimated nor counted as harmless: the score is based only on the values available and is therefore provisional. It is not a health assessment and says nothing about the water beyond the service connection. Methodology v3: how we calculate the WaterScore.
Evidence: cite and check
- Die Qualität des Sindelfinger Trinkwassers (typische Analysewerte je Wasser; Stand WW Floschen 04.09.2025, WW See 05.06.2025, BWV Jahresmitte 2024) (Stadtwerke Sindelfingen GmbH) · SHA-256 of the evaluated file: b497d21942313d60…, checked on 13 October 2026
Suggested citation: Trinkwassermonitor (2025): Tap water in Sindelfingen. Values according to the water supplier’s test report, sampling date 4 September 2025; at the waterworks, not household plumbing. https://trinkwassermonitor.ink/en/tap-water/sindelfingen/
JSON: /api/v1/evidence?city=sindelfingen
Data as of: 4 September 2025 · verified: 9 of 9 evaluated parameters. (older than twelve months – under § 46 TrinkwV your supplier must publish current values online)
This page shows only verified test data with sources, or states explicitly where data is missing (no estimated values). Cite as: “Trinkwassermonitor (2026). Tap water in Sindelfingen. Retrieved from https://trinkwassermonitor.ink/en/tap-water/sindelfingen/.”