How much nitrate is in the drinking water in Issum?

Stadtwerke Geldern GmbH publishes a nitrate value of 21,8 mg/l for the supply zone Hartefeld. The statutory parametric value is 50 mg/l; the measured value represents 44 % of the parametric value. Basis: Publication by the water supplier, retrieved on 13/07/2026.

Who supplies the drinking water in Issum?

Stadtwerke Geldern GmbH. The values shown here come from the supply zone Hartefeld 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 Issum

3 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.

Hartefeld

Stadtwerke Geldern GmbH

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

Key values Hartefeld
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	21,8 mg/l	50 mg/l	44 %	Mean · Hartefeld
Lead	<0,002 mg/l below limit of quantification	10 µg/l	< 20 % *	Mean · Hartefeld
Escherichia coli (E. coli)	0 MPN/100 ml	0/100 ml	—	Mean · Hartefeld
Sulphate	99,2 mg/l	250 mg/l	40 %	Mean · Hartefeld
Sodium	16,9 mg/l	200 mg/l	8 %	Mean · Hartefeld

* 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 (31 — most recent value per parameter)

Microbiology (1)

Microbiology – Hartefeld
Parameter	Value	Parametric value	Share of the parametric value	Reference
Escherichia coli (E. coli)	0 MPN/100 ml	0/100 ml	—	Mean · Hartefeld

Chemical parameters (5)

Chemical parameters – Hartefeld
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	0,08 mg/l	1.5 mg/l	5 %	Mean · Hartefeld
Lead	<0,002 mg/l below limit of quantification	10 µg/l	< 20 % *	Mean · Hartefeld
Nitrate	21,8 mg/l	50 mg/l	44 %	Mean · Hartefeld
Nitrite	<0,020 mg/l below limit of quantification	0.5 mg/l	< 4 % *	Mean · Hartefeld
Uranium	<0,0001 mg/l below limit of quantification	10 µg/l	< 1 % *	Mean · Hartefeld

Indicator parameters (18)

Indicator parameters – Hartefeld
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 · Hartefeld
Ammonium	<0,020 mg/l below limit of quantification	0.5 mg/l	< 4 % *	Mean · Hartefeld
Calcite dissolution capacity	0 mg/l	5 mg/l CaCO3	—	Mean · Hartefeld
Chloride	37,4 mg/l	250 mg/l	15 %	Mean · Hartefeld
Coliform bacteria	0 MPN/100 ml	0/100 ml	—	Mean · Hartefeld
Colony count 22 °C	0 in 1 ml	ohne anormale Veränderung	—	Mean · Hartefeld
Colony count 36 °C	0 in 1 ml	ohne anormale Veränderung	—	Mean · Hartefeld
Colour	<0,10 m-1 below limit of quantification	0.5 m⁻¹	—	Mean · Hartefeld
Conductivity (25 °C)	601 µS/cm	2,790 µS/cm	—	Mean · Hartefeld
Iron	0,007 mg/l	0.2 mg/l	3 %	Mean · Hartefeld
Manganese	<0,005 mg/l below limit of quantification	50 µg/l	< 10 % *	Mean · Hartefeld
Odour	ohne -	für den Verbraucher annehmbar	—	Mean · Hartefeld
pH	7,9 -	6,5–9,5	—	Mean · Hartefeld
Sodium	16,9 mg/l	200 mg/l	8 %	Mean · Hartefeld
Sulphate	99,2 mg/l	250 mg/l	40 %	Mean · Hartefeld
Temperature	11,7 °C	—	—	Mean · Hartefeld
Total organic carbon (TOC)	1,9 mg/l	ohne anormale Veränderung	—	Mean · Hartefeld
Turbidity	0,18 NTU	1 NTU	—	Mean · Hartefeld

Further parameters (7)

Further parameters – Hartefeld
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	2,53 mmol/l	—	—	Mean · Hartefeld
Base capacity to pH 8.2	0,08 mmol/l	—	—	Mean · Hartefeld
Calcite precipitation capacity	5,2 mg/l	—	—	Mean · Hartefeld
Calcium	79,0 mg/l	—	—	Mean · Hartefeld
Carbonate hardness	7,1 °dH	—	—	Mean · Hartefeld
Magnesium	15,0 mg/l	—	—	Mean · Hartefeld
Sum of alkaline earth metals	2,59 mmol/l	—	—	Mean · Hartefeld

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.stadtwerke-geldern.de/media/files/Jahresdurchschnittsanalyse-Geldern-2025_aktuell.pdf · Mittelwerte für das Jahr 2025 · retrieved on 13/07/2026

Postcodes in this zone: 47661

Show 2 more supply zones

Versorgungsgebiet Issum (ausgenommen Issum, Huckstraße und Ortsteil Sevelen); Herkunft des Trinkwassers: Wasserwerk Moers-Gerdt

Gelsenwasser

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

Water hardness

Hardness range 2,31

Key values Versorgungsgebiet Issum (ausgenommen Issum, Huckstraße und Ortsteil Sevelen); Herkunft des Trinkwassers: Wasserwerk Moers-Gerdt
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	10 mg/l	50 mg/l	20 %	Median
Sulphate	56 mg/l	250 mg/l	22 %	Median
Sodium	29 mg/l	200 mg/l	14 %	Median

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

Chemical parameters (1)

Chemical parameters – Versorgungsgebiet Issum (ausgenommen Issum, Huckstraße und Ortsteil Sevelen); Herkunft des Trinkwassers: Wasserwerk Moers-Gerdt
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	10 mg/l	50 mg/l	20 %	Median

Indicator parameters (8)

Indicator parameters – Versorgungsgebiet Issum (ausgenommen Issum, Huckstraße und Ortsteil Sevelen); Herkunft des Trinkwassers: Wasserwerk Moers-Gerdt
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcite dissolution capacity	2,4 mg/l	5 mg/l CaCO3	—	Median
Chloride	52 mg/l	250 mg/l	21 %	Median
Conductivity (25 °C)	590 µS/cm	2,790 µS/cm	—	Median
pH	7,50	6,5–9,5	—	Median
Sodium	29 mg/l	200 mg/l	14 %	Median
Sulphate	56 mg/l	250 mg/l	22 %	Median
Temperature	13,5 °C	—	—	Median
Total organic carbon (TOC)	0,8 mg/l	ohne anormale Veränderung	—	Median

Further parameters (8)

Further parameters – Versorgungsgebiet Issum (ausgenommen Issum, Huckstraße und Ortsteil Sevelen); Herkunft des Trinkwassers: Wasserwerk Moers-Gerdt
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	3,27 mmol/l	—	—	Median
Base capacity to pH 8.2	0,26 mmol/l	—	—	Median
Calcium	75 mg/l	—	—	Median
Hardness range (WRMG)	2,31 mmol/l	—	—	Median
Magnesium	11,0 mg/l	—	—	Median
Oxygen	4,2 mg/l	—	—	Median
Potassium	3,6 mg/l	—	—	Median
Silicate / silicic acid	3,5 mg/l	—	—	Median

Source: https://www.gelsenwasser.de/fileadmin/Gelsenwasser/80_footer/8.1-tw_parameter/issum_inst.pdf · 2025 · retrieved on 11/07/2026

Postcodes in this zone: 47661

Werksausgang - Trinkwasser nach Desinfektion

Wasserverbund Niederrhein GmbH

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

Water hardness

12.7 °dH

Hardness range mittel

Key values Werksausgang - Trinkwasser nach Desinfektion
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	9,5 mg/l	50 mg/l	19 %	Mean
Lead	< 0,001 mg/l below limit of quantification	10 µg/l	< 10 % *	Mean
Sulphate	52,9 mg/l	250 mg/l	21 %	Mean
Sodium	29,2 mg/l	200 mg/l	15 %	Mean

Show all recorded parameters (42 — most recent value per parameter)

Chemical parameters (23)

Chemical parameters – Werksausgang - Trinkwasser nach Desinfektion
Parameter	Value	Parametric value	Share of the parametric value	Reference
1,2-dichloroethane	< 0,1 µg/l below limit of quantification	3 µg/l	< 3 % *	Mean
Acrylamide	< 0,03 µg/l below limit of quantification	0.1 µg/l	< 30 % *	Mean
Antimony	< 0,0010 mg/l below limit of quantification	5 µg/l	< 20 % *	Mean
Arsenic	< 0,001 mg/l below limit of quantification	10 µg/l	< 10 % *	Mean
Benzene	< 0,1 µg/l below limit of quantification	1 µg/l	< 10 % *	Mean
Benzo(a)pyrene	< 0,002 µg/l below limit of quantification	10 ng/l	< 20 % *	Mean
Boron	0,037 mg/l	1 mg/l	4 %	Mean
Bromate	< 0,002 mg/l below limit of quantification	10 µg/l	< 20 % *	Mean
Cadmium	< 0,0002 mg/l below limit of quantification	3 µg/l	< 7 % *	Mean
Chromium	< 0,001 mg/l below limit of quantification	25 µg/l	< 4 % *	Mean
Copper	< 0,0020 mg/l below limit of quantification	2 mg/l	< 0.1 % *	Mean
Cyanide	< 0,0050 mg/l below limit of quantification	50 µg/l	< 10 % *	Mean
Epichlorohydrin	< 0,03 µg/l below limit of quantification	0.1 µg/l	< 30 % *	Mean
Fluoride	0,12 mg/l	1.5 mg/l	8 %	Mean
Lead	< 0,001 mg/l below limit of quantification	10 µg/l	< 10 % *	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	9,5 mg/l	50 mg/l	19 %	Mean
Nitrite	< 0,002 mg/l below limit of quantification	0.5 mg/l	< 0.4 % *	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
Uranium	0,725 µg/l	10 µg/l	7 %	Mean
Vinyl chloride	< 0,05 µg/l below limit of quantification	0.5 µg/l	< 10 % *	Mean

Indicator parameters (12)

Indicator parameters – Werksausgang - Trinkwasser nach Desinfektion
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	< 0,2 mg/l below limit of quantification	0.5 mg/l	< 40 % *	Mean
Chloride	50,4 mg/l	250 mg/l	20 %	Mean
Colour	- 1/m not determined	0.5 m⁻¹	—	Mean
Conductivity (25 °C)	592 µS/cm	2,790 µS/cm	—	Mean
Iron	< 0,010 mg/l below limit of quantification	0.2 mg/l	< 5 % *	Mean
Manganese	< 0,010 mg/l below limit of quantification	50 µg/l	< 20 % *	Mean
Sodium	29,2 mg/l	200 mg/l	15 %	Mean
Sulphate	52,9 mg/l	250 mg/l	21 %	Mean
Temperature	13,9 °C	—	—	Mean
Total organic carbon (TOC)	0,64 mg/l	ohne anormale Veränderung	—	Mean
Turbidity	< 0,10 NTU below limit of quantification	1 NTU	—	Mean

Further parameters (7)

Further parameters – Werksausgang - Trinkwasser nach Desinfektion
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	72,3 mg/l	—	—	Mean
Hardness range (WRMG)	mittel	—	—	Single value
Magnesium	10,5 mg/l	—	—	Mean
Oxygen	4,9 mg/l	—	—	Mean
Phosphate	0,11 mg/l	—	—	Mean
Potassium	3,6 mg/l	—	—	Mean
Total hardness	12,7 °dH	—	—	Mean

Source: https://www.rww.de/fileadmin/assets/pdf/trinkwasseranalyse_rheurdt.pdf · 2025 · retrieved on 13/07/2026

Postcodes in this zone: 47661

Frequently asked questions about drinking water in Issum

How much nitrate is in the drinking water in Issum?: Stadtwerke Geldern GmbH publishes a nitrate value of 21,8 mg/l for the supply zone Hartefeld. The statutory parametric value is 50 mg/l; the measured value represents 44 % of the parametric value. Basis: Publication by the water supplier, retrieved on 13/07/2026.
Who supplies the drinking water in Issum?: Stadtwerke Geldern GmbH. The values shown here come from the supply zone Hartefeld 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.