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Water hardness in the Netherlands

We are increasingly asked what the hardness of tap water is in certain municipalities. To answer this question, we have listed the hardness of tap water in all municipalities in the Netherlands in alphabetical order. The hardness of tap water is different in every municipality because the tap water is extracted from different areas in the Netherlands.

From 6 °D we speak of hard water.

Water hardness in the Netherlands differs per region

The Dutch water companies use different water sources. The amount of minerals varies per source. The hardness therefore also varies per region. The Water Supply Decree (which determines the standards that Dutch water companies must adhere to) describes both a minimum and a maximum standard for the hardness of tap water. This should be between 5.6°D and 14°D.  

Municipality  DH
Aa and Hunze 7.6
Aalburg 9.7
Aalsmeer 7.9
Aalten 7.8 - 9.2
Eight cart games 9.2 - 9.6
Alblasserdam 7.6
Albrandswaard 8.5
Alkmaar 7.9
Almelo 5.2 - 8
Almere 4.7 - 5.0
Alphen aan den Rijn 8.5
Alphen-Chaam 7.95 - 10.25
Ameland 6.8 - 9.5
Amersfoort 5.5 - 6.5
Amstelveen 7.9
Amsterdam 7.8
Anna Paulowna 7.9
Apeldoorn 6.2 - 5.7
Appingedam 11
Arnhem 6 - 9.3
Axes 7.9
Asten 8.34 - 10.7
Baarle-Nassau 7.95 - 10.64
Baarn 6.4 -7
Barendrecht 8.5
Barneveld 6
Bedum 10.8
Beek (L.) 7.34 - 7.84
Beemster 7.9
Beesel 7.34 - 7.84
Bellingwedde 11
Bergeijk 4.82 - 10.81
Mountain and Valley 5.6
Mons (L.) 7.34 - 7.84
Bergen (NH.) 79
Bergen op Zoom 8.29 - 8.4
Berkelland 6.4 - 73
Bernheze 7.78 - 8.06
Best 8.01 - 10.81
Beuningen 5.9 - 7.6
Beverwijk 7.9
het Bildt 6.6 - 8.3
De Bilt 5.5 - 6.1
Bilthoven 6.4
Binnenmaas 8.5
Bladel 4.82 - 10.81
Blaricum 7.9
Bloemendaal 7.9
Bodegraven-Reeuwijk 7.2
Boekel 7.34 - 7.84
Ten Boer 12.5
Borger-Odoorn 7.7
Borne 8 - 10.7
Borsele 9.5
Boxmeer 7.84 - 10.25
Boxtel 6.61 - 8.06
Breda 8.34 - 10.70
Bredene 18
Brielle 8.5
Bronckhorst 3.8 - 10.1
Brummen 5.9
Brunssum 7.34 - 7.84
Bunnik 6.1 - 7.2
Bunschoten 5.9
Neighbors 6.6- 11.2
Capelle aan den IJssel 8.5
Castricum 7.9
Coevorden 10.6
Cranendonck 6.44
Crumble rows 8.5
Cuijk 7.84 - 8.01
Culemborg 7.3
Dalfsen 6.2 - 8.3
Dantumadeel 9.3 - 9.6
The Frisian Lakes 6.5 - 8
Delft 8.5
Delfzijl 11
Deurne 8.34 - 10.7
Deventer 6.8 - 85
Diemen 7.9
Dinkelland 6.7 - 13.9
Dirksland 14.5
Doesburg 5.9 - 6.2
Doetinchem 7.8 - 10.9
Dongen 8.34
Dongeradeel 7.6 - 9.5
Dordrecht 8.5
Drechterland 7.9
Drumming 8.29 - 10.25
Dronten 6.2 - 7.5
Druten 6.6 - 6.7
Pigeons 5.9 - 7.5
Echt-Susteren 7.34 - 7.84
Edam-Volendam 7.9
Ede 6.6
Eemnes 6.4 
Eemsmond 10.8 - 12.5
Eersel 4.82 - 10.81
Eijsden-Margraten 7.34 - 7.84
Eindhoven 5.82 - 6.5
Elburg 3.9
Emmen 7.7
Enkhuizen 7.9
Enschede 7.6 - 87
Epe 2.5 - 3.9
Ermelo 5.6
Etten-Leur 8.29 - 10.64
Ferwerderadeel 6.8 - 10
Franeker 6.7
Franekeradeel 6.3 - 6.9
Geertruidenberg 8.34
Geldermalsen 7.3
Geldrop-Mierlo 6.5 - 10.25
Gemert-Bakel 7.34 - 10.7
Gennep 7.34 - 7.84
Giessenlanden 9.5
Gilze and Rijen 8.34 - 10.64
Goodwill 14.5
Goeree-Overflakkee 14.5
Gooise Meren 7.8
Goes 9.5
Goirle 7.95
Gorinchem 7.3
Gouda 9.1
Graph current 13.3
Grave 7.78 - 8.06
The Hague / The Hague (municipality) 8.5
Groesbeek 5.6 - 89
Groningen (municipality) 9
Grand guest 9
Gulpen-Wittem 7.34 - 7.84
Haaksbergen 7.4 - 75
Haaren 6.61
Haarlem 7.9
Haarlemmerliede and Spaarnwoude 7.9
Haarlemmermeer 7.9
Halderberge 8.29
Hardenberg 9.1 - 101
Harderwijk 5.6 - 5.7
Hardinxveld-Giessendam 7.3
Haren 7.7
Harlingen 6.1 - 6.4
Hattem 4.9 - 7.6
Heemskerk 7.9
Heemstede 7.9
Heerde 2.5
Heerenveen 6.8 - 8.3
Heerhugowaard 7.5
Heerlen 7.34 - 7.84
Heeze-Leende 6.44 - 8.34
Heiloo 7.9
Den Helder 7.9
Hellendoorn 5.2 - 89
Hellevoetsluis 8.5
Helmond 10.25
Hendrik-Ido-Ambacht 8.2 - 96
Hengelo (O.) 3.3 - 67
Den Bosch / 's-Hertogenbosch 7.17 - 9.3
Heumen 7.6 - 9.0
Heusden 6.61 - 9.7
Hillegom 8.5
Hilvarenbeek 5.49 - 10.81
Hilversum 7.4
Hoeksche Waard 8.5
Court of Twente 6.3 - 10.9
Dutch Crown 7.9
Hoogeveen 8
Hoogezand-Sappemeer 7.7 - 12.5
Horn 7.9
Horst aan de Maas 7.34 - 7.84
Wooden 7.8
Houses 7.9
Hulst 8.5
IJsselstein 7.5 
Julianadorp 6 - 10.3
Kaag and Braassem 7.6
Camps 4 - 7.6
Chapelle 9.5
Katwijk 8.5
Kerkrade 7.34 - 7.84
Koggenland 7.9
Kollumerland and Nieuwkruisland 9.1 - 10.1
Krimpen aan den IJssel 7.3
Krimpenerwaard 9.1
Laarbeek 7.95 - 10.25
Landerd 7.78 - 8.06
Landgraaf 7.34 - 7.84
Landsmeer 7.9
Langedijk 7.9
Lansingerland 8.5
Laren (NH.) 79
Lake 9
Leerdam 7.3
Leeuwarden 6.6  9.7
Leeuwardera part 7.6 - 9.5
Leiden 8.5
Leiderdorp 7.6
Leidschendam-Voorburg 8.5
Lelystad 4.5 - 62
Leudal 7.34 - 7.84
Leusden 5.4
Lingewaal 7.3
Lingewaard 7.6 - 7.7
Lisse 8.5
Littenseradiel 6.5
Lochem 5.9 - 6.4
Loon op Zand 7.95 - 9.70
Lopik 7.6
Loppersum 10.8
Lower 7.5 - 83
Maarssen 5.9 - 7.7
Maasdriel 6.2 - 64
Maasgouw 7.34 - 7.84
Maassluis 8.5
Maastricht 7.34 - 7.84
The Marne 9 - 10.8
Marum 9
Medemblik 7.9
Meerssen 7.34 - 7.84
Menameradiel 6.8 - 7.6
Menterwolde 11 - 12.5
Meppel 7.5
Middelburg (Z.) 9.5
Midden-Delfland 8.5
Central Drenthe 10.7
Mill and Saint Hubert 7.84
Moerdijk 8.29 - 10.25
Molenlanden 7.3
Montferland 5.6 - 9.0
Montfoort 7.3
Mook and Mediator 7.34 - 7.84
Muiden 7.9
Naarden 7.9
Lower Betuwe 5.1 - 11.4
Nederweert 8.23
Neerijnen 6.5 - 66
Niedorp 7.9
Nieuwegein 6.9
Nieuwkoop 7.2
Nijkerk 5.9 - 6.3
Nijmegen 9
Nissewaard 8.5
North Beveland 9.5
Noordenveld 8.1 -8.2
Noordoostpolder 8 - 8.3
Noordwijk 8.5
Nuenen, Gerwen and Nederwetten 6.5
Nunspeet 4
Nuth 7.34 - 7.84
Oegstgeest 8.5
Oirschot 5.49 - 10.81
Oisterwijk 5.49 - 10.81
Oldambt 11
Oldebroek 3.9
Oldenzaal 7.4 - 11.8
Olst-Wijhe 2.3 - 7.1
Ommen 7.5 - 92
Subbenches 7.34 - 7.84
East Gelre 7.5 - 84
Oosterhout 8.34 - 10.25
Ooststellingwerf 6.9 - 7.2
Oostzaan 7.9
More 7.9
Opsterland 7.4
Oss 7.78 - 8.06
Old IJssel region 7.7 - 10.9
Ouder-Amstel 7.9
Oudewater 9.1
Overbetuwe 7.6
Papendrecht 7.6
Peel and Maas 7.34 - 7.84
Pekela 11
Pijnacker-Nootdorp 8.5
Purmerend 7.9
Wells 6.2 - 67
Raalte 5.7 - 7.8
Reimerswaal 9.5
Renkum 4.6 - 6.3
Renswoude 6 - 6.6
Reusel-De Mierden 10.81
Rheden 3.8 - 5.9
Rhenen 6.5 - 6.8
Ridderkerk 9.6
Rhine values 5.7 - 7.6
Rijnwoude  
Rijssen-Holten 5.3 - 7.2
Rijswijk (ZH.) 8.5
Roerdalen 7.34 - 7.84
Roermond 7.34 - 7.84
The Round Fens 4.5 - 7.6
Roosendaal 8.29 - 10.25
Rotterdam 8.5
Rozendaal 6 - 8.2
Rucphen 8.29
Schagen 7.9
Scherpenzeel 5.8 - 6.0
Schiedam 8.5
Schiermonnikoog 6.9
Schijndel 8.06
Schinnen 7.34 - 7.84
Schouwen-Duiveland 13
Simple field 7.34 - 7.84
Sint Anthonis 7.84 - 10.25
Sint-Michielsgestel 8.06 - 9.3
Sint-Oedenrode 8.01 - 8.06
Sittard-Geleen 7.34 - 7.84
Sliedrecht 7.3
Slochteren 7.7 - 12.5
Lock 8.5
Smallingerland 7.3
Soest 6.6
Someren 8.34 - 10.7
Son and Breugel 6.5 - 8.01
City Canal 9.4
Staphorst 7.5
Stede Broec 7.9
Steenbergen 8.29 - 8.4
Steenwijkerland 7.4 - 84
Stein (L.) 7.34 - 7.84
Stichtse Vecht 6.4 - 8.9
Súdwest Fryslân 6.6
Terneuzen 8.5
Terschelling 6.9
Texel 7.9
Teylingen 8.5
Tholen 8.5
Tiel 11.4
Tilburg 6.61 - 7.95
Tubbergen 5.7 - 10.9
Twenterand 7.2 - 101
Tynaarlo 8.2
Tytsjerksteradiel 9
Uden 7.78 - 7.84
Uitgeest 6
Uithoorn 7.9
Urk 8.1 - 85
Utrecht (municipality) 7.5
Utrechtse Heuvelrug 5.5 - 6.2
Vaals 7.34 - 7.84
Valkenburg aan de Geul 7.34 - 7.84
Valkenswaard 6.5
Veendam 11
Veenendaal 6.0 - 7.0
Veere 9.5
Veghel 7.84 - 8.06
Veldhoven 5.82 - 6.5
Velsen 7.9
Venlo 7.34 - 7.84
Venray 7.34 - 7.84
Vianen 7.3
Vlaardingen 8.5
Flagtwedde 9.4
Vlieland 6.8
Vlissingen 9.5
Voerendaal 7.34 - 7.84
Voorschoten 8.5
Forest 5.7
Vught 6.61
Waalre 6.5
Waalwijk 6.61 - 9.7
Waddinxveen 9.1
Wageningen 4.6 - 6.5
Wassenaar 8.5
Waterland 7.9
Weert 7.34 - 7.84
Weesp 6.2 - 7.1
Werkendam 9.7
West Maas and Waal 6
Westerveld 8
Westervoort 6
Westland 8.5
Weststellingwerf 7 - 7.5
Westvoorne 8.5
Wierden 5.6 - 101
Wieringen 7.6 - 7.9
Wieringermeer 7.9
Wijchen 7.6 - 7.9
Wijdemeren 6 - 7.4
Neighborhood near Duurstede 7.1 - 7.5
Winsum 10.8
Winterswijk 7.5
Woensdrecht 8.8
Woerden 7.2
De Wolden 8.3
Wormerland 7.9
Woudenberg 5.9 - 6.1 
Woudrichem 10.36
Zaanstad 7.9
Zaltbommel 6.2
Zandvoort 7.9
Zederik 7.3
Sea catch 7.9
Zeewolde 5.7
Zeist 5.4 - 8.5
Zevenaar 5.7
Zoetermeer 8.5
Zoeterwoude 7.6
Zuidhorn 7.7 - 9
Zuidplas 9.1
Zundert 8.29
Zutphen 3.4 - 6.2
Zwartewaterland 7.4 - 7.9
Zwijndrecht 8.2
Zwolle 6 - 7.6
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