How hard is the water in Dülmen?

Gelsenwasser publishes a total hardness of 7.7 °dH for the supply zone Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350) (hardness range weich). 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: Publication by the water supplier, retrieved on 11/07/2026.

How much nitrate is in the drinking water in Dülmen?

Gelsenwasser publishes a nitrate value of 9,2 mg/l for the supply zone Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350). The statutory parametric value is 50 mg/l; the measured value represents 18 % of the parametric value. Basis: Publication by the water supplier, retrieved on 11/07/2026.

Who supplies the drinking water in Dülmen?

Gelsenwasser. The values shown here come from the supply zone Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350) 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 Dülmen

9 supply zones — values can differ depending on the district. Below is the zone with the most documented parameters, the others collapsed underneath. 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.

Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)

Gelsenwasser

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

Water hardness

7.7 °dH

Hardness range weich

Key values Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	9,2 mg/l	50 mg/l	18 %	Mean
Lead	<0,0005 mg/l below limit of quantification	10 µg/l	< 5 % *	Mean
Escherichia coli (E. coli)	0 KBE/100 ml	0/100 ml	—	Mean
Sulphate	42 mg/l	250 mg/l	17 %	Mean
Sodium	41 mg/l	200 mg/l	21 %	Mean

* 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.

Show all recorded parameters (59 — most recent value per parameter)

Microbiology (2)

Microbiology – Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Escherichia coli (E. coli)	0 KBE/100 ml	0/100 ml	—	Mean
Intestinal enterococci	0 KBE/100 ml	0/100 ml	—	Mean

Chemical parameters (26)

Chemical parameters – Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)
Parameter	Value	Parametric value	Share of the parametric value	Reference
1,2-dichloroethane	<0,05 µg/l below limit of quantification	3 µg/l	< 2 % *	Mean
Antimony	<0,001 mg/l below limit of quantification	5 µg/l	< 20 % *	Mean
Arsenic	<0,0005 mg/l below limit of quantification	10 µg/l	< 5 % *	Mean
Benzene	<0,05 µg/l below limit of quantification	1 µg/l	< 5 % *	Mean
Benzo(a)pyrene	<0,0025 µg/l below limit of quantification	10 ng/l	< 25 % *	Mean
Bisphenol A	<0,015 µg/l below limit of quantification	2.5 µg/l	< 0.6 % *	Mean
Boron	0,07 mg/l	1 mg/l	7 %	Mean
Bromate	<0,0030 mg/l below limit of quantification	10 µg/l	< 30 % *	Mean
Cadmium	<0,0003 mg/l below limit of quantification	3 µg/l	< 10 % *	Mean
Chlorate	<0,003 mg/l below limit of quantification	70 µg/l	< 4 % *	Mean
Chlorite	<0,010 mg/l below limit of quantification	0.2 mg/l	< 5 % *	Mean
Chromium	<0,0004 mg/l below limit of quantification	25 µg/l	< 2 % *	Mean
Copper	<0,005 mg/l below limit of quantification	2 mg/l	< 0.3 % *	Mean
Cyanide	<0,005 mg/l below limit of quantification	50 µg/l	< 10 % *	Mean
Fluoride	0,11 mg/l	1.5 mg/l	7 %	Mean
Lead	<0,0005 mg/l below limit of quantification	10 µg/l	< 5 % *	Mean
Mercury	<0,0001 mg/l below limit of quantification	1 µg/l	< 10 % *	Mean
Nickel	<0,002 mg/l below limit of quantification	20 µg/l	< 10 % *	Mean
Nitrate	9,2 mg/l	50 mg/l	18 %	Mean
Nitrite	0,01 mg/l	0.5 mg/l	2 %	Mean
Pesticides — Total	<0,025 µg/l below limit of quantification	0.5 µg/l	< 5 % *	Mean
Polycyclic aromatic hydrocarbons	<0,005 µg/l below limit of quantification	0.1 µg/l	< 5 % *	Mean
Selenium	<0,001 mg/l below limit of quantification	10 µg/l	< 10 % *	Mean
Tetrachloroethene and Trichloroethene (sum)	<0,05 µg/l below limit of quantification	10 µg/l	< 0.5 % *	Mean
Trihalomethanes — Total	<0,050 µg/l below limit of quantification	50 µg/l	< 0.1 % *	Mean
Uranium	<0,001 mg/l below limit of quantification	10 µg/l	< 10 % *	Mean

Indicator parameters (18)

Indicator parameters – Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	<0,010 mg/l below limit of quantification	0.2 mg/l	< 5 % *	Mean
Ammonium	<0,05 mg/l below limit of quantification	0.5 mg/l	< 10 % *	Mean
Calcite dissolution capacity	1 mg/l	5 mg/l CaCO3	—	Mean
Chloride	55 mg/l	250 mg/l	22 %	Mean
Clostridium perfringens (including spores)	0 KBE/100 ml	0/100 ml	—	Mean
Coliform bacteria	0 KBE/100 ml	0/100 ml	—	Mean
Colony count 22 °C	0 KBE/ml	ohne anormale Veränderung	—	Mean
Colony count 36 °C	0 KBE/ml	ohne anormale Veränderung	—	Mean
Colour	<0,10 1/m below limit of quantification	0.5 m⁻¹	—	Mean
Conductivity (25 °C)	491 µS/cm	2,790 µS/cm	—	Mean
Iron	<0,010 mg/l below limit of quantification	0.2 mg/l	< 5 % *	Mean
Manganese	<0,002 mg/l below limit of quantification	50 µg/l	< 4 % *	Mean
pH	7,9	6,5–9,5	—	Mean
Sodium	41 mg/l	200 mg/l	21 %	Mean
Sulphate	42 mg/l	250 mg/l	17 %	Mean
Temperature	14,1 °C	—	—	Mean
Total organic carbon (TOC)	0,8 mg/l	ohne anormale Veränderung	—	Mean
Turbidity	<0,05 FNU below limit of quantification	1 NTU	—	Mean

Radiology (2)

Radiology – Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Indicative dose	<0,1 mSv/a below limit of quantification	0.1 mSv/a	—	Mean
Radon-222	<10 Bq/l below limit of quantification	100 Bq/l	—	Mean

Further parameters (11)

Further parameters – Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	2,2 mmol/l	—	—	Mean
Base capacity to pH 8.2	0,06 mmol/l	—	—	Mean
Calcium	42 mg/l	—	—	Mean
Carbonate hardness	6,2 °dH	—	—	Mean
Hardness range (WRMG)	weich	—	—	Mean
Magnesium	7,9 mg/l	—	—	Mean
Oxygen	10,5 mg/l	—	—	Mean
Phosphate	0,23 mg/l	—	—	Mean
Potassium	4,4 mg/l	—	—	Mean
Silicate / silicic acid	4,9 mg/l	—	—	Mean
Total hardness	7,7 °dH	—	—	Mean

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.gelsenwasser.de/fileadmin/twa/downloads/gelsenwasser/trinkwasseranalyse_essen.pdf · 2025 · retrieved on 11/07/2026

Postcodes in this zone: 48249

Show 8 more supply zones

Versorgungsgebiet der Stadtwerke Essen AG (Herkunft des Trinkwassers: Verbundwasserwerk Essen, Wassergewinnung Essen GmbH)

Gelsenwasser

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

Water hardness

Hardness range 1,38

Key values Versorgungsgebiet der Stadtwerke Essen AG (Herkunft des Trinkwassers: Verbundwasserwerk Essen, Wassergewinnung Essen GmbH)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	9 mg/l	50 mg/l	18 %	Median
Sulphate	42 mg/l	250 mg/l	17 %	Median
Sodium	41 mg/l	200 mg/l	21 %	Median

Show all recorded parameters (17 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – Versorgungsgebiet der Stadtwerke Essen AG (Herkunft des Trinkwassers: Verbundwasserwerk Essen, Wassergewinnung Essen GmbH)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	9 mg/l	50 mg/l	18 %	Median

Indicator parameters (8)

Indicator parameters – Versorgungsgebiet der Stadtwerke Essen AG (Herkunft des Trinkwassers: Verbundwasserwerk Essen, Wassergewinnung Essen GmbH)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcite dissolution capacity	0,8 mg/l	5 mg/l CaCO3	—	Median
Chloride	55 mg/l	250 mg/l	22 %	Median
Conductivity (25 °C)	491 µS/cm	2,790 µS/cm	—	Median
pH	7,90	6,5–9,5	—	Median
Sodium	41 mg/l	200 mg/l	21 %	Median
Sulphate	42 mg/l	250 mg/l	17 %	Median
Temperature	14,1 °C	—	—	Median
Total organic carbon (TOC)	0,8 mg/l	ohne anormale Veränderung	—	Median

Further parameters (8)

Further parameters – Versorgungsgebiet der Stadtwerke Essen AG (Herkunft des Trinkwassers: Verbundwasserwerk Essen, Wassergewinnung Essen GmbH)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	2,20 mmol/l	—	—	Median
Base capacity to pH 8.2	0,06 mmol/l	—	—	Median
Calcium	42 mg/l	—	—	Median
Hardness range (WRMG)	1,38 mmol/l	—	—	Median
Magnesium	7,9 mg/l	—	—	Median
Oxygen	10,5 mg/l	—	—	Median
Potassium	4,4 mg/l	—	—	Median
Silicate / silicic acid	2,3 mg/l	—	—	Median

Source: https://www.gelsenwasser.de/fileadmin/Gelsenwasser/80_footer/8.1-tw_parameter/essen_inst.pdf · Median 2025 (Jahresmittelwert) · retrieved on 13/07/2026

Postcodes in this zone: 48249

Wasserwerk Bucholtwelmen

Gelsenwasser

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

Water hardness

14.7 °dH

Hardness range hart

Key values Wasserwerk Bucholtwelmen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	15 mg/l	50 mg/l	30 %	Mean
Lead	<0,0005 mg/l below limit of quantification	10 µg/l	< 5 % *	Mean
Escherichia coli (E. coli)	0 KBE/100 ml	0/100 ml	—	Mean
Sulphate	83 mg/l	250 mg/l	33 %	Mean
Sodium	15 mg/l	200 mg/l	8 %	Mean

Show all recorded parameters (57 — most recent value per parameter)

Microbiology (2)

Microbiology – Wasserwerk Bucholtwelmen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Escherichia coli (E. coli)	0 KBE/100 ml	0/100 ml	—	Mean
Intestinal enterococci	0 KBE/100 ml	0/100 ml	—	Mean

Chemical parameters (24)

Chemical parameters – Wasserwerk Bucholtwelmen
Parameter	Value	Parametric value	Share of the parametric value	Reference
1,2-dichloroethane	<0,05 µg/l below limit of quantification	3 µg/l	< 2 % *	Mean
Antimony	<0,001 mg/l below limit of quantification	5 µg/l	< 20 % *	Mean
Arsenic	<0,0005 mg/l below limit of quantification	10 µg/l	< 5 % *	Mean
Benzene	<0,05 µg/l below limit of quantification	1 µg/l	< 5 % *	Mean
Benzo(a)pyrene	<0,0025 µg/l below limit of quantification	10 ng/l	< 25 % *	Mean
Bisphenol A	<0,015 µg/l below limit of quantification	2.5 µg/l	< 0.6 % *	Mean
Boron	0,05 mg/l	1 mg/l	5 %	Mean
Bromate	<0,0030 mg/l below limit of quantification	10 µg/l	< 30 % *	Mean
Cadmium	<0,0003 mg/l below limit of quantification	3 µg/l	< 10 % *	Mean
Chromium	<0,0004 mg/l below limit of quantification	25 µg/l	< 2 % *	Mean
Copper	<0,005 mg/l below limit of quantification	2 mg/l	< 0.3 % *	Mean
Cyanide	<0,005 mg/l below limit of quantification	50 µg/l	< 10 % *	Mean
Fluoride	0,1 mg/l	1.5 mg/l	7 %	Mean
Lead	<0,0005 mg/l below limit of quantification	10 µg/l	< 5 % *	Mean
Mercury	<0,0001 mg/l below limit of quantification	1 µg/l	< 10 % *	Mean
Nickel	<0,002 mg/l below limit of quantification	20 µg/l	< 10 % *	Mean
Nitrate	15 mg/l	50 mg/l	30 %	Mean
Nitrite	<0,01 mg/l below limit of quantification	0.5 mg/l	< 2 % *	Mean
Pesticides — Total	<0,025 µg/l below limit of quantification	0.5 µg/l	< 5 % *	Mean
Polycyclic aromatic hydrocarbons	<0,005 µg/l below limit of quantification	0.1 µg/l	< 5 % *	Mean
Selenium	<0,001 mg/l below limit of quantification	10 µg/l	< 10 % *	Mean
Tetrachloroethene and Trichloroethene (sum)	0,06 µg/l	10 µg/l	0.6 %	Mean
Trihalomethanes — Total	<0,050 µg/l below limit of quantification	50 µg/l	< 0.1 % *	Mean
Uranium	0,001 mg/l	10 µg/l	10 %	Mean

Indicator parameters (18)

Indicator parameters – Wasserwerk Bucholtwelmen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	<0,010 mg/l below limit of quantification	0.2 mg/l	< 5 % *	Mean
Ammonium	<0,05 mg/l below limit of quantification	0.5 mg/l	< 10 % *	Mean
Calcite dissolution capacity	2 mg/l	5 mg/l CaCO3	—	Mean
Chloride	27 mg/l	250 mg/l	11 %	Mean
Clostridium perfringens (including spores)	0 KBE/100 ml	0/100 ml	—	Mean
Coliform bacteria	0 KBE/100 ml	0/100 ml	—	Mean
Colony count 22 °C	0 KBE/ml	ohne anormale Veränderung	—	Mean
Colony count 36 °C	0 KBE/ml	ohne anormale Veränderung	—	Mean
Colour	0,1 1/m	0.5 m⁻¹	—	Mean
Conductivity (25 °C)	606 µS/cm	2,790 µS/cm	—	Mean
Iron	<0,010 mg/l below limit of quantification	0.2 mg/l	< 5 % *	Mean
Manganese	<0,002 mg/l below limit of quantification	50 µg/l	< 4 % *	Mean
pH	7,42	6,5–9,5	—	Mean
Sodium	15 mg/l	200 mg/l	8 %	Mean
Sulphate	83 mg/l	250 mg/l	33 %	Mean
Temperature	11,1 °C	—	—	Mean
Total organic carbon (TOC)	2,1 mg/l	ohne anormale Veränderung	—	Mean
Turbidity	0,05 FNU	1 NTU	—	Mean

Radiology (2)

Radiology – Wasserwerk Bucholtwelmen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Indicative dose	<0,1 mSv/a below limit of quantification	0.1 mSv/a	—	Mean
Radon-222	13 Bq/l	100 Bq/l	—	Mean

Further parameters (11)

Further parameters – Wasserwerk Bucholtwelmen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	3,45 mmol/l	—	—	Mean
Base capacity to pH 8.2	0,34 mmol/l	—	—	Mean
Calcium	93 mg/l	—	—	Mean
Carbonate hardness	9,7 °dH	—	—	Mean
Hardness range (WRMG)	hart	—	—	Mean
Magnesium	7,6 mg/l	—	—	Mean
Oxygen	6,8 mg/l	—	—	Mean
Phosphate	0,06 mg/l	—	—	Mean
Potassium	5,5 mg/l	—	—	Mean
Silicate / silicic acid	12,4 mg/l	—	—	Mean
Total hardness	14,7 °dH	—	—	Mean

Source: https://www.gelsenwasser.de/fileadmin/twa/downloads/huenxe_voerde/trinkwasseranalyse_bucholtwelmen.pdf · 2025 · retrieved on 13/07/2026

Postcodes in this zone: 48249

Wasserwerk Dülmen

Stadtwerke Dülmen GmbH

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

These values are more than a year old. The most recent analysis the water supplier has published for this zone dates from 20/11/2024. We have no newer values — which is why we show the latest available ones rather than none at all. They say nothing about how the water has changed since then.

Water hardness

9.2 °dH

Hardness range medium

Key values Wasserwerk Dülmen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	5 mg/l	50 mg/l	10 %	Single value
Lead	<0,001 mg/l below limit of quantification	10 µg/l	< 10 % *	Single value
Escherichia coli (E. coli)	0 KBE/100 ml	0/100 ml	—	Single value
Sulphate	38 mg/l	250 mg/l	15 %	Single value
Sodium	15,6 mg/l	200 mg/l	8 %	Single value

Show all recorded parameters (79 — most recent value per parameter)

Microbiology (2)

Microbiology – Wasserwerk Dülmen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Escherichia coli (E. coli)	0 KBE/100 ml	0/100 ml	—	Single value
Intestinal enterococci	0 KBE/100 ml	0/100 ml	—	Single value

Chemical parameters (57)

Chemical parameters – Wasserwerk Dülmen
Parameter	Value	Parametric value	Share of the parametric value	Reference
1,2-dichloroethane	<0,0003 mg/l below limit of quantification	3 µg/l	< 10 % *	Single value
2,4-D	<0,00002 mg/l below limit of quantification	—	—	Single value
Acrylamide	<0,00001 mg/l below limit of quantification	0.1 µg/l	< 10 % *	Single value
Antimony	<0,001 mg/l below limit of quantification	5 µg/l	< 20 % *	Single value
Arsenic	<0,001 mg/l below limit of quantification	10 µg/l	< 10 % *	Single value
Atrazine	<0,00002 mg/l below limit of quantification	—	—	Single value
Bentazone	<0,00002 mg/l below limit of quantification	—	—	Single value
Benzene	<0,0002 mg/l below limit of quantification	1 µg/l	< 20 % *	Single value
Benzo(a)pyrene	<0,000001 mg/l below limit of quantification	10 ng/l	< 10 % *	Single value
Boron	<0,05 mg/l below limit of quantification	1 mg/l	< 5 % *	Single value
Bromate	<0,003 mg/l below limit of quantification	10 µg/l	< 30 % *	Single value
Bromodichloromethane	<0,0001 mg/l below limit of quantification	—	—	Single value
Bromoxynil	<0,00002 mg/l below limit of quantification	—	—	Single value
Cadmium	<0,0001 mg/l below limit of quantification	3 µg/l	< 3 % *	Single value
Chloridazon	<0,00002 mg/l below limit of quantification	—	—	Single value
Chlorotoluron	<0,00002 mg/l below limit of quantification	—	—	Single value
Chromium	0,001 mg/l	25 µg/l	4 %	Single value
Clopyralid	<0,00002 mg/l below limit of quantification	—	—	Single value
Copper	<0,10 mg/l below limit of quantification	2 mg/l	< 5 % *	Single value
Cyanide	<0,01 mg/l below limit of quantification	50 µg/l	< 20 % *	Single value
Desethylatrazine	<0,00002 mg/l below limit of quantification	—	—	Single value
Desethylterbuthylazine	<0,00002 mg/l below limit of quantification	—	—	Single value
Dibromochloromethane	<0,0001 mg/l below limit of quantification	—	—	Single value
Dichlorprop	<0,00002 mg/l below limit of quantification	—	—	Single value
Diflufenican	<0,00002 mg/l below limit of quantification	—	—	Single value
Diuron	<0,00002 mg/l below limit of quantification	—	—	Single value
Epichlorohydrin	<0,0001 mg/l below limit of quantification	0.1 µg/l	< 100 % *	Single value
Ethofumesate	<0,00002 mg/l below limit of quantification	—	—	Single value
Flufenacet	<0,00002 mg/l below limit of quantification	—	—	Single value
Fluoride	0,08 mg/l	1.5 mg/l	5 %	Single value
Hexazinone	<0,00002 mg/l below limit of quantification	—	—	Single value
Isoproturon	<0,00002 mg/l below limit of quantification	—	—	Single value
Lead	<0,001 mg/l below limit of quantification	10 µg/l	< 10 % *	Single value
MCPA	<0,00002 mg/l below limit of quantification	—	—	Single value
Mecoprop	<0,00002 mg/l below limit of quantification	—	—	Single value
Mercury	<0,0001 mg/l below limit of quantification	1 µg/l	< 10 % *	Single value
Metamitron	<0,00002 mg/l below limit of quantification	—	—	Single value
Metazachlor	<0,00002 mg/l below limit of quantification	—	—	Single value
Metolachlor	<0,00002 mg/l below limit of quantification	—	—	Single value
Metribuzin	<0,00002 mg/l below limit of quantification	—	—	Single value
Nickel	0,002 mg/l	20 µg/l	10 %	Single value
Nitrate	5 mg/l	50 mg/l	10 %	Single value
Nitrite	<0,01 mg/l below limit of quantification	0.5 mg/l	< 2 % *	Single value
Pendimethalin	<0,00002 mg/l below limit of quantification	—	—	Single value
Propiconazole	<0,00002 mg/l below limit of quantification	—	—	Single value
Quinmerac	<0,00002 mg/l below limit of quantification	—	—	Single value
Selenium	<0,001 mg/l below limit of quantification	10 µg/l	< 10 % *	Single value
Simazine	<0,00002 mg/l below limit of quantification	—	—	Single value
Tebuconazole	<0,00002 mg/l below limit of quantification	—	—	Single value
Terbuthylazine	<0,00002 mg/l below limit of quantification	—	—	Single value
Tetrachloroethene	<0,0001 mg/l below limit of quantification	—	—	Single value
Tribromomethane (bromoform)	<0,0001 mg/l below limit of quantification	—	—	Single value
Trichloroethene	<0,0001 mg/l below limit of quantification	—	—	Single value
Trichloromethane (chloroform)	0,0001 mg/l	—	—	Single value
Trihalomethanes — Total	0,0001 mg/l	50 µg/l	0.2 %	Single value
Uranium	0,002 mg/l	10 µg/l	20 %	Single value
Vinyl chloride	<0,0001 mg/l below limit of quantification	0.5 µg/l	< 20 % *	Single value

Indicator parameters (16)

Indicator parameters – Wasserwerk Dülmen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Ammonium	<0,04 mg/l below limit of quantification	0.5 mg/l	< 8 % *	Single value
Calcite dissolution capacity	-4,7 mg/l	5 mg/l CaCO3	—	Single value
Chloride	23 mg/l	250 mg/l	9 %	Single value
Coliform bacteria	0 KBE/100 ml	0/100 ml	—	Single value
Colony count 22 °C	0 KBE/ml	ohne anormale Veränderung	—	Single value
Colony count 36 °C	0 KBE/ml	ohne anormale Veränderung	—	Single value
Colour	0,2 1/m	0.5 m⁻¹	—	Single value
Iron	0,017 mg/l	0.2 mg/l	9 %	Single value
Manganese	<0,005 mg/l below limit of quantification	50 µg/l	< 10 % *	Single value
Odour	ohne	für den Verbraucher annehmbar	—	Single value
pH	7,89	6,5–9,5	—	Single value
Sodium	15,6 mg/l	200 mg/l	8 %	Single value
Sulphate	38 mg/l	250 mg/l	15 %	Single value
Taste	ohne	für den Verbraucher annehmbar	—	Single value
Temperature	12,8 °C	—	—	Single value
Turbidity	0,10 NTU	1 NTU	—	Single value

Further parameters (4)

Further parameters – Wasserwerk Dülmen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	59,1 mg/l	—	—	Single value
Magnesium	4,2 mg/l	—	—	Single value
Sum of alkaline earth metals	1,65 mmol/l	—	—	Single value
Total hardness	9,2 °dH	—	—	Single value

Source: https://www.stadtwerke-duelmen.de/download/trinkwasseranalyse-duelmen-hausduelmen-merfeld/ · 20.11.2024 · Untersuchungszeitraum 08.11.2024 bis 20.11.2024 · retrieved on 11/07/2026

Postcodes in this zone: 48249

Wasserwerk Haltern

Gelsenwasser

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

Water hardness

Hardness range 2,02

Key values Wasserwerk Haltern
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	12 mg/l	50 mg/l	24 %	Median
Sulphate	48 mg/l	250 mg/l	19 %	Median
Sodium	19 mg/l	200 mg/l	9 %	Median

Show all recorded parameters (17 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – Wasserwerk Haltern
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	12 mg/l	50 mg/l	24 %	Median

Indicator parameters (8)

Indicator parameters – Wasserwerk Haltern
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcite dissolution capacity	0,2 mg/l	5 mg/l CaCO3	—	Median
Chloride	26 mg/l	250 mg/l	10 %	Median
Conductivity (25 °C)	487 µS/cm	2,790 µS/cm	—	Median
pH	7,55	6,5–9,5	—	Median
Sodium	19 mg/l	200 mg/l	9 %	Median
Sulphate	48 mg/l	250 mg/l	19 %	Median
Temperature	13,3 °C	—	—	Median
Total organic carbon (TOC)	3,0 mg/l	ohne anormale Veränderung	—	Median

Further parameters (8)

Further parameters – Wasserwerk Haltern
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	2,97 mmol/l	—	—	Median
Base capacity to pH 8.2	0,21 mmol/l	—	—	Median
Calcium	73 mg/l	—	—	Median
Hardness range (WRMG)	2,02 mmol/l	—	—	Median
Magnesium	4,8 mg/l	—	—	Median
Oxygen	6,9 mg/l	—	—	Median
Potassium	5,3 mg/l	—	—	Median
Silicate / silicic acid	4,0 mg/l	—	—	Median

Source: https://www.gelsenwasser.de/fileadmin/Gelsenwasser/80_footer/8.1-tw_parameter/haltern_inst.pdf · 2025 · retrieved on 25/07/2026

Postcodes in this zone: 48249

Wasserwerk Haltern, Gelsenwasser AG

Gelsenwasser

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

Water hardness

Hardness range 2,02

Key values Wasserwerk Haltern, Gelsenwasser AG
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	12 mg/l	50 mg/l	24 %	Median
Sulphate	48 mg/l	250 mg/l	19 %	Median
Sodium	19 mg/l	200 mg/l	9 %	Median

Show all recorded parameters (17 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – Wasserwerk Haltern, Gelsenwasser AG
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	12 mg/l	50 mg/l	24 %	Median

Indicator parameters (8)

Indicator parameters – Wasserwerk Haltern, Gelsenwasser AG
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcite dissolution capacity	0,2 mg/l	5 mg/l CaCO3	—	Median
Chloride	26 mg/l	250 mg/l	10 %	Median
Conductivity (25 °C)	487 µS/cm	2,790 µS/cm	—	Median
pH	7,55	6,5–9,5	—	Median
Sodium	19 mg/l	200 mg/l	9 %	Median
Sulphate	48 mg/l	250 mg/l	19 %	Median
Temperature	13,3 °C	—	—	Median
Total organic carbon (TOC)	3,0 mg/l	ohne anormale Veränderung	—	Median

Further parameters (8)

Further parameters – Wasserwerk Haltern, Gelsenwasser AG
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	2,97 mmol/l	—	—	Median
Base capacity to pH 8.2	0,21 mmol/l	—	—	Median
Calcium	73 mg/l	—	—	Median
Hardness range (WRMG)	2,02 mmol/l	—	—	Median
Magnesium	4,8 mg/l	—	—	Median
Oxygen	6,9 mg/l	—	—	Median
Potassium	5,3 mg/l	—	—	Median
Silicate / silicic acid	4,0 mg/l	—	—	Median

Source: https://www.gelsenwasser.de/fileadmin/Gelsenwasser/80_footer/8.1-tw_parameter/haltern_inst.pdf · 2025 · retrieved on 25/07/2026

Postcodes in this zone: 48249

Wasserwerk Echthausen Ortsteile Hemmerde, Lünern, Siddinghausen, Westhemmerde (Mischwasser)

Gelsenwasser

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

No date is given for these values. The water supplier publishes the analysis without a sampling date and without a report date. When the water was examined is not apparent from the source — we do not add a date and we do not estimate one. What is stated is therefore only when we retrieved the document.

Water hardness

Hardness range weich

No core values are available for this zone yet.

Show all recorded parameters (1 — most recent value per parameter)

Further parameters (1)

Further parameters – Wasserwerk Echthausen Ortsteile Hemmerde, Lünern, Siddinghausen, Westhemmerde (Mischwasser)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Hardness range (WRMG)	weich	—	—	Single value · Wasserwerk Echthausen – Ortsteile Hemmerde, Lünern, Siddinghausen, Westhemmerde (Mischwasser)

Source: https://www.gelsenwasser.de/wasser/wasserhaerte/unna · retrieved on 11/07/2026

Postcodes in this zone: 48249

Wasserwerk Halingen/Fröndenberg Ortsteile Hemmerde, Lünern, Siddinghausen, Westhemmerde (Mischwasser)

Gelsenwasser

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

Water hardness

Hardness range weich

No core values are available for this zone yet.

Show all recorded parameters (1 — most recent value per parameter)

Further parameters (1)

Further parameters – Wasserwerk Halingen/Fröndenberg Ortsteile Hemmerde, Lünern, Siddinghausen, Westhemmerde (Mischwasser)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Hardness range (WRMG)	weich	—	—	Single value · Wasserwerk Halingen/Fröndenberg – Ortsteile Hemmerde, Lünern, Siddinghausen, Westhemmerde (Mischwasser)

Source: https://www.gelsenwasser.de/wasser/wasserhaerte/unna · retrieved on 11/07/2026

Postcodes in this zone: 48249

Wasserwerk Halingen/Fröndenberg Übriges Stadtgebiet Unna

Gelsenwasser

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

Water hardness

Hardness range weich

No core values are available for this zone yet.

Show all recorded parameters (1 — most recent value per parameter)

Further parameters (1)

Further parameters – Wasserwerk Halingen/Fröndenberg Übriges Stadtgebiet Unna
Parameter	Value	Parametric value	Share of the parametric value	Reference
Hardness range (WRMG)	weich	—	—	Single value · Wasserwerk Halingen/Fröndenberg – Übriges Stadtgebiet Unna

Source: https://www.gelsenwasser.de/wasser/wasserhaerte/unna · retrieved on 11/07/2026

Postcodes in this zone: 48249

Frequently asked questions about drinking water in Dülmen

How hard is the water in Dülmen?: Gelsenwasser publishes a total hardness of 7.7 °dH for the supply zone Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350) (hardness range weich). 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: Publication by the water supplier, retrieved on 11/07/2026.
How much nitrate is in the drinking water in Dülmen?: Gelsenwasser publishes a nitrate value of 9,2 mg/l for the supply zone Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350). The statutory parametric value is 50 mg/l; the measured value represents 18 % of the parametric value. Basis: Publication by the water supplier, retrieved on 11/07/2026.
Who supplies the drinking water in Dülmen?: Gelsenwasser. The values shown here come from the supply zone Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350) 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.