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 |