How hard is the water in Schwalmtal?

NEW NiederrheinWasser GmbH publishes a total hardness of 13 °dH for the supply zone Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen (hardness range medium). The hardness range is a classification under the German Detergents and Cleaning Products Act (soft below 8,4 °dH, medium 8,4 to 14 °dH, hard above that) and not a quality verdict — it indicates how much calcium and magnesium is dissolved in the water. Basis: 23.02.2026, retrieved on 11/07/2026.

How much nitrate is in the drinking water in Schwalmtal?

NEW NiederrheinWasser GmbH publishes a nitrate value of 28,1 mg/l for the supply zone Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen. The statutory parametric value is 50 mg/l; the measured value represents 56 % of the parametric value. Basis: 23.02.2026, retrieved on 11/07/2026.

Who supplies the drinking water in Schwalmtal?

NEW NiederrheinWasser GmbH. The values shown here come from the supply zone Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen and apply to the water the supplier delivers. What happens between the building connection and the tap — in old lead pipes, for example — is not covered by these analyses; information on that is provided by owners, the health authority or an examination by an accredited laboratory.

Drinking water in Schwalmtal

There are 2 places with this name — listed below by area. To determine the exact match, look up the postcode.

How to read the share of the parametric value

12 % Share of the parametric value. The proportion of the permitted maximum that the measured value uses — here 12 %, so just over an eighth.

< 10 % * Below the limit of quantification. The substance was not detectable. The mark shows where the detection limit lies relative to the parametric value — the actual share of the parametric value is below that.

Several samples per year: for chemical parameters the mean value is given, for microbiological ones the highest measured value. There the parametric value is zero — a single finding would disappear in the average, and it is precisely that finding which is the information. Which reference applies is stated in the last column of the table.

Schwalmtal (41366)

Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen

NEW NiederrheinWasser GmbH

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness

13 °dH

Hardness range medium

Key values Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	28,1 mg/l	50 mg/l	56 %	Single value
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Single value
Sulphate	125,8 mg/l	250 mg/l	50 %	Single value

Show all recorded parameters (101 — most recent value per parameter)

Microbiology (2)

Microbiology – Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Single value
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Single value

Chemical parameters (71)

Chemical parameters – Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen
Parameter	Value	Parametric value	Share of the parametric value	Reference
1,1,1-Trichloroethane	<0,2 µg/l below limit of quantification	—	—	Single value
1,2-dichloroethane	<0,2 µg/l below limit of quantification	3 µg/l	< 7 % *	Single value
Acrylamide	<0,03 µg/l below limit of quantification	0.1 µg/l	< 30 % *	Single value
AMPA	<0,03 µg/l below limit of quantification	—	—	Single value
Atrazine	0,01 µg/l	—	—	Single value
Bentazone	<0,02 µg/l below limit of quantification	—	—	Single value
Benzene	<0,20 µg/l below limit of quantification	1 µg/l	< 20 % *	Single value
Benzo(a)pyrene	<0,002 µg/l below limit of quantification	10 ng/l	< 20 % *	Single value
Benzo(b)fluoranthene	<0,005 µg/l below limit of quantification	—	—	Single value
Benzo(ghi)perylene	<0,005 µg/l below limit of quantification	—	—	Single value
Benzo(k)fluoranthene	<0,005 µg/l below limit of quantification	—	—	Single value
Bisphenol A	<0,01 µg/l below limit of quantification	2.5 µg/l	< 0.4 % *	Single value
Bromacil	<0,03 µg/l below limit of quantification	—	—	Single value
Bromate	<0,001 mg/l below limit of quantification	10 µg/l	< 10 % *	Single value
Bromodichloromethane	<0,2 µg/l below limit of quantification	—	—	Single value
Bromoxynil	<0,03 µg/l below limit of quantification	—	—	Single value
Carbofuran	<0,03 µg/l below limit of quantification	—	—	Single value
Chloridazon	<0,02 µg/l below limit of quantification	—	—	Single value
Chlorotoluron	<0,03 µg/l below limit of quantification	—	—	Single value
Chromium	<0,5 µg/l below limit of quantification	25 µg/l	< 2 % *	Single value
cis-1,2-Dichloroethene	<1,0 µg/l below limit of quantification	—	—	Single value
Copper	<10 µg/l below limit of quantification	2 mg/l	< 0.5 % *	Single value
Cyanide	<0,01 mg/l below limit of quantification	50 µg/l	< 20 % *	Single value
Desethylatrazine	<0,02 µg/l below limit of quantification	—	—	Single value
Desisopropylatrazine	<0,02 µg/l below limit of quantification	—	—	Single value
Dibromochloromethane	<0,2 µg/l below limit of quantification	—	—	Single value
Dichloromethane	<0,3 µg/l below limit of quantification	—	—	Single value
Dichlorprop	<0,02 µg/l below limit of quantification	—	—	Single value
Diflufenican	<0,02 µg/l below limit of quantification	—	—	Single value
Dimethenamid	<0,03 µg/l below limit of quantification	—	—	Single value
Diuron	<0,03 µg/l below limit of quantification	—	—	Single value
Epichlorohydrin	<0,03 µg/l below limit of quantification	0.1 µg/l	< 30 % *	Single value
Ethidimuron	<0,03 µg/l below limit of quantification	—	—	Single value
Ethofumesate	<0,02 µg/l below limit of quantification	—	—	Single value
Flufenacet	<0,03 µg/l below limit of quantification	—	—	Single value
Fluoranthene	<0,005 µg/l below limit of quantification	—	—	Single value
Fluoride	<0,100 mg/l below limit of quantification	1.5 mg/l	< 7 % *	Single value
Glyphosate	<0,03 µg/l below limit of quantification	—	—	Single value
Hexazinone	<0,03 µg/l below limit of quantification	—	—	Single value
Imidacloprid	<0,03 µg/l below limit of quantification	—	—	Single value
Isoproturon	<0,03 µg/l below limit of quantification	—	—	Single value
Lenacil	<0,03 µg/l below limit of quantification	—	—	Single value
MCPA	<0,03 µg/l below limit of quantification	—	—	Single value
Mecoprop	<0,02 µg/l below limit of quantification	—	—	Single value
Mercury	<0,1 µg/l below limit of quantification	1 µg/l	< 10 % *	Single value
Metalaxyl	<0,03 µg/l below limit of quantification	—	—	Single value
Metamitron	<0,03 µg/l below limit of quantification	—	—	Single value
Metazachlor	<0,03 µg/l below limit of quantification	—	—	Single value
Methabenzthiazuron	<0,03 µg/l below limit of quantification	—	—	Single value
Metobromuron	<0,02 µg/l below limit of quantification	—	—	Single value
Metribuzin	<0,02 µg/l below limit of quantification	—	—	Single value
Monuron	<0,02 µg/l below limit of quantification	—	—	Single value
Nicosulfuron	<0,03 µg/l below limit of quantification	—	—	Single value
Nitrate	28,1 mg/l	50 mg/l	56 %	Single value
Nitrite	<0,01 mg/l below limit of quantification	0.5 mg/l	< 2 % *	Single value
Pendimethalin	<0,02 µg/l below limit of quantification	—	—	Single value
Propazine	<0,02 µg/l below limit of quantification	—	—	Single value
Propiconazole	<0,03 µg/l below limit of quantification	—	—	Single value
Prosulfocarb	<0,03 µg/l below limit of quantification	—	—	Single value
Quinmerac	<0,02 µg/l below limit of quantification	—	—	Single value
Simazine	<0,01 µg/l below limit of quantification	—	—	Single value
Terbuthylazine	<0,02 µg/l below limit of quantification	—	—	Single value
Terbutryn	<0,02 µg/l below limit of quantification	—	—	Single value
Tetrachloroethene	<0,20 µg/l below limit of quantification	—	—	Single value
Tetrachloroethene and Trichloroethene (sum)	<1,0 µg/l below limit of quantification	10 µg/l	< 10 % *	Single value
Tetrachloromethane	<0,2 µg/l below limit of quantification	—	—	Single value
Tribromomethane (bromoform)	<0,3 µg/l below limit of quantification	—	—	Single value
Trichloroethene	<0,2 µg/l below limit of quantification	—	—	Single value
Trichloromethane (chloroform)	<0,2 µg/l below limit of quantification	—	—	Single value
Trihalomethanes — Total	<0,1 µg/l below limit of quantification	50 µg/l	< 0.2 % *	Single value
Vinyl chloride	<0,1 µg/l below limit of quantification	0.5 µg/l	< 20 % *	Single value

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

PFAS (1)

PFAS – Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen
Parameter	Value	Parametric value	Share of the parametric value	Reference
HFPO-DA (GenX)	<0,0010 µg/l below limit of quantification	—	—	Single value

Metabolites (1)

Metabolites – Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Desphenyl-chloridazon	1,60 µg/l	—	—	Single value

Indicator parameters (16)

Indicator parameters – Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	<10 µg/l below limit of quantification	0.2 mg/l	< 5 % *	Single value
Ammonium	0,055 mg/l	0.5 mg/l	11 %	Single value
Calcite dissolution capacity	3,5 mg/l	5 mg/l CaCO3	—	Single value
Chloride	44,5 mg/l	250 mg/l	18 %	Single value
Coliform bacteria	0 KBE/100ml	0/100 ml	—	Single value
Colour	0 Unit not stated in the document	0.5 m⁻¹	—	Single value
Conductivity (25 °C)	532 µS/cm	2,790 µS/cm	—	Single value
Iron	0,013 mg/l	0.2 mg/l	6 %	Single value
Manganese	0,002 mg/l	50 µg/l	4 %	Single value
Odour	00	für den Verbraucher annehmbar	—	Single value
Oxidisability	0,38 mg/l	5 mg/l O2	—	Single value
pH	7,54	6,5–9,5	—	Single value
Sulphate	125,8 mg/l	250 mg/l	50 %	Single value
Temperature	11,4 °C	—	—	Single value
Total organic carbon (TOC)	0,58 mg/l	ohne anormale Veränderung	—	Single value
Turbidity	0,18 NTU	1 NTU	—	Single value

Further parameters (10)

Further parameters – Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	64,4 mg/l	—	—	Single value
Carbonate hardness	3,4 °dH	—	—	Single value
Free carbon dioxide	2,6 mg/l	—	—	Single value
Hydrogen carbonate	75,1 mg/l	—	—	Single value
Non-carbonate hardness	9,6 °dH	—	—	Single value
Oxygen	11,0 mg/l	—	—	Single value
Phosphate	<0,05 mg/l below limit of quantification	—	—	Single value
Potassium	3,8 mg/l	—	—	Single value
Saturation index	-0,341	—	—	Single value
Total hardness	13,0 °dH	—	—	Single value

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.new.de/mediathek/WW102REIN_2025-10-06.pdf · 23.02.2026 · 06.10.2025 · retrieved on 11/07/2026

Postcodes in this zone: 41366

Show 7 more supply zones

WW Dülken 101

NEW NiederrheinWasser GmbH

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Key values WW Dülken 101
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	32,5 mg/l	50 mg/l	65 %	Single value

Show all recorded parameters (6 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – WW Dülken 101
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	32,5 mg/l	50 mg/l	65 %	Single value

Indicator parameters (1)

Indicator parameters – WW Dülken 101
Parameter	Value	Parametric value	Share of the parametric value	Reference
pH	7,82	6,5–9,5	—	Single value

Radiology (2)

Radiology – WW Dülken 101
Parameter	Value	Parametric value	Share of the parametric value	Reference
Gross alpha activity	< 0,025 Bq/l below limit of quantification	—	—	Single value · 09/2016 - 06/2017 (Erstuntersuchung)
Indicative dose	< 0,100 mSv/a below limit of quantification	0.1 mSv/a	—	Single value · 09/2016 - 06/2017 (Erstuntersuchung)

Further parameters (2)

Further parameters – WW Dülken 101
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	60,1 mg/l	—	—	Single value
Magnesium	15,1 mg/l	—	—	Single value

Source: https://trinkwasseranalyse.new.de/ · 13.01.2026 · retrieved on 11/07/2026

Postcodes in this zone: 41366

WW Gatzweiler 009

NEW NiederrheinWasser GmbH

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Key values WW Gatzweiler 009
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	22,2 mg/l	50 mg/l	44 %	Single value

Show all recorded parameters (6 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – WW Gatzweiler 009
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	22,2 mg/l	50 mg/l	44 %	Single value

Indicator parameters (1)

Indicator parameters – WW Gatzweiler 009
Parameter	Value	Parametric value	Share of the parametric value	Reference
pH	7,98	6,5–9,5	—	Single value

Radiology (2)

Radiology – WW Gatzweiler 009
Parameter	Value	Parametric value	Share of the parametric value	Reference
Gross alpha activity	< 0,025 Bq/l below limit of quantification	—	—	Single value
Indicative dose	< 0,100 mSv/a below limit of quantification	0.1 mSv/a	—	Single value

Further parameters (2)

Further parameters – WW Gatzweiler 009
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	69,4 mg/l	—	—	Single value
Magnesium	10,6 mg/l	—	—	Single value

Source: https://trinkwasseranalyse.new.de/ · 07.01.2026 · retrieved on 11/07/2026

Postcodes in this zone: 41366

WW Helenabrunn 001

NEW NiederrheinWasser GmbH

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Key values WW Helenabrunn 001
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	18,4 mg/l	50 mg/l	37 %	Single value

Show all recorded parameters (6 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – WW Helenabrunn 001
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	18,4 mg/l	50 mg/l	37 %	Single value

Indicator parameters (1)

Indicator parameters – WW Helenabrunn 001
Parameter	Value	Parametric value	Share of the parametric value	Reference
pH	7,97	6,5–9,5	—	Single value

Radiology (2)

Radiology – WW Helenabrunn 001
Parameter	Value	Parametric value	Share of the parametric value	Reference
Gross alpha activity	<0,025 Bg/l below limit of quantification	—	—	Single value · Ergebnisse der Erstuntersuchungen 09/2016 - 06/2017
Indicative dose	<0,100 mSv/a below limit of quantification	0.1 mSv/a	—	Single value · Ergebnisse der Erstuntersuchungen 09/2016 - 06/2017

Further parameters (2)

Further parameters – WW Helenabrunn 001
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	77,9 mg/l	—	—	Single value
Magnesium	12,8 mg/l	—	—	Single value

Source: https://trinkwasseranalyse.new.de/ · vom 20.01.2026 · retrieved on 11/07/2026

Postcodes in this zone: 41366

WW Hoppbruch 013

NEW NiederrheinWasser GmbH

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Key values WW Hoppbruch 013
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	7,1 mg/l	50 mg/l	14 %	Single value

Show all recorded parameters (6 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – WW Hoppbruch 013
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	7,1 mg/l	50 mg/l	14 %	Single value

Indicator parameters (1)

Indicator parameters – WW Hoppbruch 013
Parameter	Value	Parametric value	Share of the parametric value	Reference
pH	7,65	6,5–9,5	—	Single value

Radiology (2)

Radiology – WW Hoppbruch 013
Parameter	Value	Parametric value	Share of the parametric value	Reference
Gross alpha activity	< 0,025 Bq/l below limit of quantification	—	—	Single value
Indicative dose	< 0,100 mSv/a below limit of quantification	0.1 mSv/a	—	Single value

Further parameters (2)

Further parameters – WW Hoppbruch 013
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	63,9 mg/l	—	—	Single value
Magnesium	17,2 mg/l	—	—	Single value

Source: https://trinkwasseranalyse.new.de/ · 06.01.2026 · retrieved on 11/07/2026

Postcodes in this zone: 41366

WW Rasseln 003

NEW NiederrheinWasser GmbH

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness

12.1 °dH

Hardness range medium

Key values WW Rasseln 003
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	36,6 mg/l	50 mg/l	73 %	Single value

Show all recorded parameters (7 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – WW Rasseln 003
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	36,6 mg/l	50 mg/l	73 %	Single value

Indicator parameters (1)

Indicator parameters – WW Rasseln 003
Parameter	Value	Parametric value	Share of the parametric value	Reference
pH	7,43	6,5–9,5	—	Single value

Radiology (2)

Radiology – WW Rasseln 003
Parameter	Value	Parametric value	Share of the parametric value	Reference
Gross alpha activity	< 0,025 Bq/l below limit of quantification	—	—	Single value
Indicative dose	< 0,100 mSv/a below limit of quantification	0.1 mSv/a	—	Single value

Further parameters (3)

Further parameters – WW Rasseln 003
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	66,4 mg/l	—	—	Single value
Magnesium	12,2 mg/l	—	—	Single value
Total hardness	12,1 °dH	—	—	Single value

Source: https://trinkwasseranalyse.new.de/ · 20.01.2026 · retrieved on 11/07/2026

Postcodes in this zone: 41366

WW Reststrauch 011

NEW NiederrheinWasser GmbH

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Key values WW Reststrauch 011
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	5,6 mg/l	50 mg/l	11 %	Single value

Show all recorded parameters (6 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – WW Reststrauch 011
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	5,6 mg/l	50 mg/l	11 %	Single value

Indicator parameters (1)

Indicator parameters – WW Reststrauch 011
Parameter	Value	Parametric value	Share of the parametric value	Reference
pH	7,56	6,5–9,5	—	Single value

Radiology (2)

Radiology – WW Reststrauch 011
Parameter	Value	Parametric value	Share of the parametric value	Reference
Gross alpha activity	< 0,025 Bq/l below limit of quantification	—	—	Single value
Indicative dose	< 0,100 mSv/a below limit of quantification	0.1 mSv/a	—	Single value

Further parameters (2)

Further parameters – WW Reststrauch 011
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	85,1 mg/l	—	—	Single value
Magnesium	13,0 mg/l	—	—	Single value

Source: https://trinkwasseranalyse.new.de/ · 06.01.2026 · retrieved on 11/07/2026

Postcodes in this zone: 41366

WW Viersen 102

NEW NiederrheinWasser GmbH

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Key values WW Viersen 102
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	28,6 mg/l	50 mg/l	57 %	Single value

Show all recorded parameters (6 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – WW Viersen 102
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	28,6 mg/l	50 mg/l	57 %	Single value

Indicator parameters (1)

Indicator parameters – WW Viersen 102
Parameter	Value	Parametric value	Share of the parametric value	Reference
pH	7,68	6,5–9,5	—	Single value

Radiology (2)

Radiology – WW Viersen 102
Parameter	Value	Parametric value	Share of the parametric value	Reference
Gross alpha activity	< 0,025 Bq/l below limit of quantification	—	—	Single value
Indicative dose	< 0,100 mSv/a below limit of quantification	0.1 mSv/a	—	Single value

Further parameters (2)

Further parameters – WW Viersen 102
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	64,4 mg/l	—	—	Single value
Magnesium	15,7 mg/l	—	—	Single value

Source: https://trinkwasseranalyse.new.de/ · vom 13.01.2026 · retrieved on 11/07/2026

Postcodes in this zone: 41366

Frequently asked questions about drinking water in Schwalmtal

How hard is the water in Schwalmtal?: NEW NiederrheinWasser GmbH publishes a total hardness of 13 °dH for the supply zone Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen (hardness range medium). The hardness range is a classification under the German Detergents and Cleaning Products Act (soft below 8,4 °dH, medium 8,4 to 14 °dH, hard above that) and not a quality verdict — it indicates how much calcium and magnesium is dissolved in the water. Basis: 23.02.2026, retrieved on 11/07/2026.
How much nitrate is in the drinking water in Schwalmtal?: NEW NiederrheinWasser GmbH publishes a nitrate value of 28,1 mg/l for the supply zone Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen. The statutory parametric value is 50 mg/l; the measured value represents 56 % of the parametric value. Basis: 23.02.2026, retrieved on 11/07/2026.
Who supplies the drinking water in Schwalmtal?: NEW NiederrheinWasser GmbH. The values shown here come from the supply zone Wasserwerk Viersen, Aachener Weg 21, 41747 Viersen and apply to the water the supplier delivers. What happens between the building connection and the tap — in old lead pipes, for example — is not covered by these analyses; information on that is provided by owners, the health authority or an examination by an accredited laboratory.

General questions — how current the data is, limit of quantification, parametric values, who is behind this site — are answered under Questions & answers.

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For postcode 36318 there is no verified assignment yet.