Tap water hardness in Friesland
We have published hardness data for 103 cities in Friesland. The median is 7.2 °dH; the hardest water is in Broeksterwâld (8.7 °dH), the softest in Schiermonnikoog (6.5 °dH).
87 % 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 Friesland, hardest first
| °dH | mg/L | ||
|---|---|---|---|
| Broeksterwâld | 8.7 | 155 | hard |
| Rottevalle | 8.5 | 152 | hard |
| Tytsjerk | 8.5 | 152 | hard |
| Feanwâlden | 8.4 | 150 | hard |
| Burgum | 8.3 | 148 | hard |
| Drogeham | 8.3 | 148 | hard |
| Holwert | 8.3 | 148 | hard |
| Damwâld | 8.2 | 147 | hard |
| Harkema | 8.2 | 146 | hard |
| Hurdegaryp | 8.2 | 146 | hard |
| Kollum | 8.2 | 146 | hard |
| Nes | 8.2 | 146 | hard |
| Ternaard | 8.2 | 146 | hard |
| Twijzel | 8.2 | 146 | hard |
| Augustinusga | 8.1 | 145 | hard |
| De Westereen | 8.1 | 145 | hard |
| Ferwert | 8.1 | 145 | hard |
| Kollumersweach | 8.1 | 145 | hard |
| Dokkum | 8.1 | 144 | hard |
| Buitenpost | 8 | 143 | hard |
| Garyp | 8 | 143 | hard |
| Noardburgum | 8 | 143 | hard |
| Surhuisterveen | 8 | 143 | hard |
| Twijzelerheide | 8 | 143 | hard |
| Burdaard | 7.9 | 142 | hard |
| Leeuwarden | 7.9 | 142 | hard |
| Kootstertille | 7.9 | 141 | hard |
| Oentsjerk | 7.9 | 141 | hard |
| Eastermar | 7.8 | 139 | hard |
| Drachtstercompagnie | 7.7 | 137 | hard |
| Gytsjerk | 7.7 | 137 | hard |
| Haulerwijk | 7.6 | 136 | hard |
| Marrum | 7.6 | 136 | hard |
| Sint Annaparochie | 7.6 | 136 | hard |
| Ureterp | 7.6 | 136 | hard |
| Appelscha | 7.5 | 134 | hard |
| Bakkeveen | 7.5 | 134 | hard |
| Boornbergum | 7.5 | 134 | hard |
| Donkerbroek | 7.5 | 134 | hard |
| Hallum | 7.5 | 134 | hard |
| Jubbega | 7.5 | 134 | hard |
| Wijnjewoude | 7.5 | 134 | hard |
| Beetsterzwaag | 7.4 | 132 | hard |
| Berltsum | 7.4 | 132 | hard |
| Drachten | 7.4 | 132 | hard |
| Oosterwolde | 7.4 | 132 | hard |
| Opeinde | 7.4 | 132 | hard |
| Nieuwehorne | 7.3 | 130 | hard |
| Oudega | 7.3 | 130 | hard |
| Stiens | 7.3 | 130 | hard |
| Noordwolde | 7.2 | 129 | hard |
| Sint Jacobiparochie | 7.2 | 129 | hard |
| De Knipe | 7.1 | 127 | hard |
| Gorredijk | 7.1 | 127 | hard |
| Wommels | 7.1 | 127 | hard |
| Bakhuizen | 7 | 125 | hard |
| IJlst | 7 | 125 | hard |
| Koudum | 7 | 125 | hard |
| Marsum | 7 | 125 | hard |
| Minnertsga | 7 | 125 | hard |
| Oost-Vlieland | 7 | 125 | hard |
| Oudeschoot | 7 | 125 | hard |
| Sintjohannesga | 7 | 125 | hard |
| Tijnje | 7 | 125 | hard |
| West-Terschelling | 7 | 125 | hard |
| Witmarsum | 7 | 125 | hard |
| Wolvega | 7 | 125 | hard |
| Heerenveen | 6.9 | 124 | hard |
| Balk | 6.9 | 123 | hard |
| Bolsward | 6.9 | 123 | hard |
| Joure | 6.9 | 123 | hard |
| Langweer | 6.9 | 123 | hard |
| Makkum | 6.9 | 123 | hard |
| Menaam | 6.9 | 123 | hard |
| Oldeberkoop | 6.9 | 123 | hard |
| Oranjewoud | 6.9 | 123 | hard |
| Warga | 6.9 | 123 | hard |
| Zuiderburen | 6.9 | 122 | hard |
| Dronryp | 6.8 | 121 | hard |
| Echtenerbrug | 6.8 | 121 | hard |
| Franeker | 6.8 | 121 | hard |
| Goutum | 6.8 | 121 | hard |
| Mantgum | 6.8 | 121 | hard |
| Oudemirdum | 6.8 | 121 | hard |
| Scharnegoutum | 6.8 | 121 | hard |
| Sint Nicolaasga | 6.8 | 121 | hard |
| Sneek | 6.8 | 121 | hard |
| Tzum | 6.8 | 121 | hard |
| Workum | 6.8 | 121 | hard |
| Harlingen | 6.8 | 121 | hard |
| Akkrum | 6.7 | 120 | moderately hard |
| Aldeboarn | 6.7 | 120 | moderately hard |
| Hollum | 6.7 | 120 | moderately hard |
| Lemmer | 6.7 | 120 | moderately hard |
| Oudehaske | 6.7 | 120 | moderately hard |
| Sexbierum | 6.7 | 120 | moderately hard |
| Woudsend | 6.7 | 120 | moderately hard |
| Grou | 6.6 | 118 | moderately hard |
| Heeg | 6.6 | 118 | moderately hard |
| Jirnsum | 6.6 | 118 | moderately hard |
| Oppenhuizen | 6.6 | 118 | moderately hard |
| Tzummarum | 6.6 | 118 | moderately hard |
| Schiermonnikoog | 6.5 | 116 | moderately hard |