TrinkwassermonitorTap water in Germany

Water hardness and tap water in Rommerskirchen

Rhein-Kreis Neuss, Nordrhein-Westfalen · Postcode 41569

This page is a translation of the German version; the German page is authoritative. German version · Report a translation error

Short answer: The tap water in Rommerskirchen has a total hardness of 12.4 °dH, hardness range “medium” (as of 2025). All tested parameters with a legal limit (18) meet the limits set by the German Drinking Water Ordinance (TrinkwV). Source: test report by Kreiswerke Grevenbroich. WaterScore: 100 out of 100 (data coverage: 7 of 7 core parameters).

Verified drinking-water values

ParameterValueLimit (TrinkwV)Sampling dateSourceStatus
Nitrate19.18 mg/L
50 mg/L2025Kreiswerke Grevenbroich GmbHverified
Nitrite< 0.02 mg/L0.5 mg/L
2025Kreiswerke Grevenbroich GmbHverified
PFAS (sum)0.002 µg/L0.1 µg/L

2025Kreiswerke Grevenbroich GmbHverified
Lead< 0.002 mg/L0.01 mg/L
2025Kreiswerke Grevenbroich GmbHverified
Arsenic< 0.001 mg/L0.01 mg/L
2025Kreiswerke Grevenbroich GmbHverified
Uranium0.0009 mg/L0.01 mg/L2025Kreiswerke Grevenbroich GmbHverified
Mercury< 0.0001 mg/L0.001 mg/L2025Kreiswerke Grevenbroich GmbHverified
Copper0.064 mg/L2 mg/L2025Kreiswerke Grevenbroich GmbHverified
Cadmium< 0.0002 mg/L0.003 mg/L2025Kreiswerke Grevenbroich GmbHverified
Chromium< 0.0005 mg/L0.025 mg/L
2025Kreiswerke Grevenbroich GmbHverified
Chloride26.1 mg/L
250 mg/L2025Kreiswerke Grevenbroich GmbHverified
Sulphate107 mg/L
250 mg/L2025Kreiswerke Grevenbroich GmbHverified
Sodium31.1 mg/L
200 mg/L2025Kreiswerke Grevenbroich GmbHverified
Calcium61 mg/L–2025Kreiswerke Grevenbroich GmbHverified
Magnesium17 mg/L–2025Kreiswerke Grevenbroich GmbHverified
pH7.76.5–9.52025Kreiswerke Grevenbroich GmbHverified
Total hardness12.4 °dH (medium)no legal limit2025Kreiswerke Grevenbroich GmbHverified
Electrical conductivity582 µS/cm–2025Kreiswerke Grevenbroich GmbHverified
Fluoride0.08 mg/L1.5 mg/L2025Kreiswerke Grevenbroich GmbHverified
Iron< 0.006 mg/L0.2 mg/L2025Kreiswerke Grevenbroich GmbHverified
Manganese< 0.006 mg/L0.05 mg/L2025Kreiswerke Grevenbroich GmbHverified
Ammonium< 0.02 mg/L0.5 mg/L2025Kreiswerke Grevenbroich GmbHverified
Coliform bacteria0 KBE/100ml0 per 100 ml2025Kreiswerke Grevenbroich GmbHverified

Note from the test report (in the German original): Mittelwerte 2025 der Kreiswerke, Spalte Wasserwerk Mühlenbusch, keine einzelne Probe. Die Kreiswerke beliefern alle aufgeführten Ortsteile der Gemeinde und nennen sie „mittel“. Mühlenbusch arbeitet im Verbund mit dem Wasserwerk Driesch, eine Werkszuordnung je Ort nennen sie nicht; beide Werke sind fast gleich hart (12,40 und 12,43 °dH), Nitrat 19,18 und 23,65 mg/l. Blei und Kupfer sind Werte am Werk und können im eigenen Haus abweichen.

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

Water at your own tap: The values describe the water the supplier delivers – not automatically the water at your tap. The water supplier is responsible up to the service connection (Hausanschluss); the building owner is responsible for the pipes beyond it. Lead can dissolve from lead pipes, leaded solder joints or old brass fittings, especially when water has stood in the pipes for a long time (stagnant water); this mainly affects buildings constructed before about 1973. If water has stood in the pipes for several hours, let it run until it comes out cool. If you suspect lead pipes, a lead analysis of the stagnant water by an accredited laboratory will help.

Background on household plumbing, not a measurement: in Rommerskirchen, 41 % of buildings with living space were built before 1970, and a further 15 % 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 Rommerskirchen

Water hardness in Rommerskirchen in everyday life

At 12.4 °dH, Rommerskirchen is in the hardness range “medium” (soft: below 8.4 °dH, medium: 8.4–14 °dH, hard: above 14 °dH).

Baby food and low sodium: tap water in Rommerskirchen 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 Rommerskirchen 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.

Values at the waterworks next to the maximum levels for bottled water “suitable for infant food”
SubstanceMaximum levelValue in Rommerskirchen
Sodium20 mg/l31.1 mg/l – above the bottled-water threshold
Nitrate10 mg/l19.18 mg/l – above the bottled-water threshold
Nitrite0.02 mg/lbelow the detection limit (0.02 mg/l) – not above
Sulphate240 mg/l107 mg/l – not above
Fluoride0.7 mg/l0.08 mg/l – not above
Manganese0.05 mg/lbelow the detection limit (0.006 mg/l) – not above
Arsenic0.005 mg/lbelow the detection limit (0.001 mg/l) – not above
Uranium0.002 mg/l0.0009 mg/l – not above

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

Frequently asked questions about tap water in Rommerskirchen

Can you drink the tap water in Rommerskirchen?

According to the verified values, yes: All tested parameters with a legal limit (18) meet the limits set by the German Drinking Water Ordinance (TrinkwV). WaterScore: 100 out of 100 (data coverage: 7 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 Rommerskirchen?

The total hardness is 12.4 °dH – hardness range “medium”. Dose detergent for the hardness range “medium”.

Is there PFAS in the tap water in Rommerskirchen?

Yes, in measurable amounts: according to the published analysis by Kreiswerke Grevenbroich (as of 2025), the sum of PFAS-20 is 0.002 (middle of the range given by the supplier) µg/l – that is 2 % of the limit of 0.1 µg/l, which has applied since 12 January 2026.

Do I need to filter my tap water in Rommerskirchen?

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

Data coverage: 7 of 7 core parameters. 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

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

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

Data as of: 2025 · verified: 23 of 23 evaluated parameters.

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 Rommerskirchen. Retrieved from https://trinkwassermonitor.ink/en/tap-water/rommerskirchen/.”

Further information