Tap water hardness in Utrecht
We have published hardness data for 59 cities in Utrecht. The median is 6.8 °dH; the hardest water is in Groenekan (8.7 °dH), the softest in Langenoord (5.6 °dH).
53 % of these cities have hard or very hard water (over 120 mg/L).
Dutch suppliers report °dH; most networks are softened centrally to 5.6–8.4 °dH.
Cities in Utrecht, hardest first
| °dH | mg/L | ||
|---|---|---|---|
| Groenekan | 8.7 | 155 | hard |
| Maarssen | 8.6 | 154 | hard |
| Baambrugge | 8.2 | 146 | hard |
| Wijk bij Duurstede | 8.2 | 146 | hard |
| Cothen | 8.1 | 145 | hard |
| Montfoort | 8.1 | 145 | hard |
| Oudewater | 8.1 | 145 | hard |
| Abcoude | 8 | 143 | hard |
| Harmelen | 8 | 143 | hard |
| Linschoten | 8 | 143 | hard |
| Mijdrecht | 8 | 143 | hard |
| Vinkeveen | 8 | 143 | hard |
| Wilnis | 8 | 143 | hard |
| Woerden | 8 | 143 | hard |
| Werkhoven | 7.9 | 141 | hard |
| Veldhuizen | 7.8 | 139 | hard |
| Vleuten | 7.8 | 139 | hard |
| De Meern | 7.7 | 138 | hard |
| Hollandsche Rading | 7.4 | 132 | hard |
| Odijk | 7.3 | 130 | hard |
| Rhenen | 7.2 | 129 | hard |
| Houten | 7.2 | 129 | hard |
| Nieuwegein | 7.1 | 128 | hard |
| Lopik | 7.1 | 127 | hard |
| Veenendaal | 7 | 125 | hard |
| IJsselstein | 6.9 | 124 | hard |
| Bunnik | 6.9 | 123 | hard |
| Soest | 6.9 | 122 | hard |
| Soestdijk | 6.9 | 122 | hard |
| Renswoude | 6.8 | 121 | hard |
| Soesterberg | 6.8 | 121 | hard |
| Den Dolder | 6.7 | 120 | moderately hard |
| Doorn | 6.6 | 118 | moderately hard |
| Woudenberg | 6.6 | 118 | moderately hard |
| Baarn | 6.5 | 116 | moderately hard |
| Breukelen | 6.5 | 116 | moderately hard |
| De Bilt | 6.4 | 114 | moderately hard |
| Hoogland | 6.4 | 114 | moderately hard |
| Huis ter Heide | 6.4 | 114 | moderately hard |
| Maarn | 6.4 | 114 | moderately hard |
| Spakenburg | 6.4 | 114 | moderately hard |
| Utrecht | 6.4 | 114 | moderately hard |
| Bilthoven | 6.3 | 113 | moderately hard |
| Bosch en Duin | 6.3 | 112 | moderately hard |
| Maartensdijk | 6.3 | 112 | moderately hard |
| Westbroek | 6.3 | 112 | moderately hard |
| Bunschoten | 6.2 | 112 | moderately hard |
| Amerongen | 6.2 | 111 | moderately hard |
| Driebergen-Rijsenburg | 6.2 | 111 | moderately hard |
| Loenen aan de Vecht | 6.2 | 111 | moderately hard |
| Overberg | 6.2 | 111 | moderately hard |
| Amersfoort | 6 | 107 | moderately hard |
| Leersum | 6 | 107 | moderately hard |
| Zeist | 5.8 | 104 | moderately hard |
| Leusden | 5.7 | 103 | moderately hard |
| Leusden-Zuid | 5.7 | 103 | moderately hard |
| Austerlitz | 5.6 | 101 | moderately hard |
| Achterveld | 5.6 | 100 | moderately hard |
| Langenoord | 5.6 | 100 | moderately hard |