Water hardness and tap water in Mörfelden-Walldorf
Landkreis Groß-Gerau, Hessen · Postcode 64546
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 (34), at the waterworks
- Water hardness12.9 °dH, mediumNo legal limit, only a range
- Data coverageCore parameters: 5 of 7Score based on complete data
Verified drinking-water values: water “Wasserwerk Mörfelden”
Note from the test report (in the German original): Stadtwerke Mörfelden-Walldorf · Ausgewählte Inhaltsstoffe, Trinkwasseruntersuchung 2025 (Labor Fresenius). Diese Werte gelten für das Wasserwerk Mörfelden, Probe vom 17.03.2025. Die Stadtwerke veröffentlichen beide Wasserwerke getrennt, aber nicht, welches Werk welche Adresse beliefert; die Werte unterscheiden sich vor allem beim Nitrat deutlich. Auskunft geben die Stadtwerke. PFAS nennt diese Übersicht nicht.
Background on household plumbing, not a measurement: in Mörfelden-Walldorf, 54 % of buildings with living space were built before 1970, and a further 19 % 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 Mörfelden-Walldorf
- Nitrate 0.5 mg/L – about 1 % of the limit of 50 mg/L and in the unremarkable range. 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.
- pH 7.62 – 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 Mörfelden-Walldorf in everyday life
At 12.9 °dH, Mörfelden-Walldorf is in the hardness range “medium” (soft: below 8.4 °dH, medium: 8.4–14 °dH, hard: above 14 °dH).
- Dose detergent for the hardness range “medium”.
- As a rule of thumb, descale the kettle about every four to six weeks and the coffee machine as the manufacturer recommends.
- A limescale protection device is not a must at medium hardness; regular descaling is often enough.
Baby food and low sodium: tap water in Mörfelden-Walldorf 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 Mörfelden-Walldorf 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.
| Substance | Maximum level | Value in Mörfelden-Walldorf |
|---|---|---|
| Sodium | 20 mg/l | 19.2 mg/l – not above |
| Nitrate | 10 mg/l | 0.5 mg/l – not above |
| Nitrite | 0.02 mg/l | below the detection limit (0.02 mg/l) – not above |
| Sulphate | 240 mg/l | 96 mg/l – not above |
| Fluoride | 0.7 mg/l | below the detection limit (0.2 mg/l) – not above |
| Manganese | 0.05 mg/l | below the detection limit (0.005 mg/l) – not above |
| Arsenic | 0.005 mg/l | below the detection limit (0.001 mg/l) – not above |
| Uranium | 0.002 mg/l | not in the report |
Against the other thresholds of Annex 6, the water would qualify as: low in sodium (“suitable for a low-sodium diet”) (Sodium 19.2 mg/l, threshold below 20 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 Mörfelden-Walldorf
Can you drink the tap water in Mörfelden-Walldorf?
According to the verified values, yes: All tested parameters with a legal limit (34) meet the limits set by the German Drinking Water Ordinance (TrinkwV). WaterScore: 97.6 out of 100 (data coverage: 5 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 Mörfelden-Walldorf?
It depends on the address: Wasserwerk Mörfelden 12.9 °dH and Wasserwerk Walldorf 12.8 °dH – both in the hardness range “medium”. Dose detergent for the hardness range “medium”.
Is there PFAS in the tap water in Mörfelden-Walldorf?
The published analysis by Stadtwerke Mörfelden-Walldorf 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 Mörfelden-Walldorf?
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.
Is the nitrate level in Mörfelden-Walldorf a concern?
It depends on the address: Wasserwerk Mörfelden 0.5 mg/L and Wasserwerk Walldorf 29 mg/L. All values are below the limit of 50 mg/L. The limit of the Drinking Water Ordinance also applies to preparing baby food; mineral water labelled “suitable for preparing infant food” („geeignet für die Zubereitung von Säuglingsnahrung“) may contain at most 10 mg/L nitrate. Boiling does not help against nitrate.
WaterScore
- Total97.6 / 100
- Chemical safety100 / 100
- Heavy metals100 / 100
- Nutrients100 / 100
- General parameters100 / 100
- Data timeliness87.4 / 100
- Data quality100 / 100
Data coverage: 5 of 7 core parameters. Not in the test report: Uranium and 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
- Ausgewählte Inhaltsstoffe im Trinkwasser von Mörfelden-Walldorf, Ergebnisse der Trinkwasseruntersuchung 2025 (Stadtwerke Mörfelden-Walldorf (Analyse: Labor Fresenius, Taunusstein)) · SHA-256 of the evaluated file: b7fc1d245579bb6c…, checked on 1 November 2026
Suggested citation: Trinkwassermonitor (2025): Tap water in Mörfelden-Walldorf. Values according to the water supplier’s test report, sampling date 17 March 2025; at the waterworks, not household plumbing. https://trinkwassermonitor.ink/en/tap-water/moerfelden-walldorf/
JSON: /api/v1/evidence?city=moerfelden-walldorf
Data as of: 17 March 2025 · verified: 20 of 20 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 Mörfelden-Walldorf. Retrieved from https://trinkwassermonitor.ink/en/tap-water/moerfelden-walldorf/.”