Water hardness and tap water in Rinteln

Landkreis Schaumburg, Niedersachsen · Postcode 31737

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 (57), at the waterworks
• Water hardness28.5 °dH, hardNo legal limit, only a range
• Data coverageCore parameters: 6 of 7Score based on complete data

Verified drinking-water values: water “Netz Rinteln”

Note from the test report (in the German original): Die Stadtwerke nennen vier Netze, sagen aber nicht, welche Ortsteile zu welchem Netz gehören. Dieser Bericht gilt für das Netz Rinteln: Netzprobe vom 13.05.2025 im Bürgerhaus am Marktplatz, an einem Waschtisch, also aus der Hausinstallation und nicht ab Werk. Der Bericht nennt kein PFAS. Die Härte in den Netzen reicht von 10,6 bis 28,5 °dH, hier gilt der höchste Wert.

Is a value wrong or out of date? Report an error – we check every report against the original source.

Background on household plumbing, not a measurement: in Rinteln, 54 % of buildings with living space were built before 1970, and a further 18 % 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 Rinteln

• Nitrate 17 mg/L – about 34 % of the limit of 50 mg/L and in the medium range – such values occur in catchments shaped by agriculture. Boiling does not reduce nitrate.
• Lead – not detectable at the waterworks. Lead gets into the water almost only through old lead pipes in household plumbing, not via the supplier.
• Uranium – not detectable at the waterworks (limit 10 µg/L).
• pH 7.1 – 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 Rinteln in everyday life

At 28.5 °dH, Rinteln 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 Rinteln 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 Rinteln 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)

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.

Against the other thresholds of Annex 6, the water would qualify as: containing calcium (Calcium 162.6 mg/l, threshold above 150 mg/l).

Questions about baby food are answered by your midwife, your paediatrician and the health office (Gesundheitsamt).

Frequently asked questions about tap water in Rinteln

WaterScore

• Total97.5 / 100
• Chemical safety100 / 100
• Heavy metals100 / 100
• Nutrients100 / 100
• General parameters94.4 / 100
• Data timeliness90.5 / 100
• Data quality100 / 100

Data coverage: 6 of 7 core parameters. Not in the test report: PFAS (sum). Missing parameters are neither estimated nor counted as harmless: the score is based only on the values available. It is not a health assessment and says nothing about the water beyond the service connection. Methodology v4: how we calculate the WaterScore.

Evidence: cite and check

• Prüfbericht 250580303, Netz Rinteln, Bürgerhaus Marktplatz 13, Probenahme 13.05.2025 (Stadtwerke Rinteln GmbH (Analyse: NordLab)) · SHA-256 of the evaluated file: 7b216d04ca8c1723…, checked on 1 November 2026

Suggested citation: Trinkwassermonitor (2025): Tap water in Rinteln. Values according to the water supplier’s test report, sampling date 13 May 2025; at the waterworks, not household plumbing. https://trinkwassermonitor.ink/en/tap-water/rinteln/

JSON: /api/v1/evidence?city=rinteln

Data as of: 13 May 2025 · verified: 23 of 23 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 Rinteln. Retrieved from https://trinkwassermonitor.ink/en/tap-water/rinteln/.”

Further information

• German version: Trinkwasser in Rinteln
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