Hardest and softest tap water in Belgium

All 1091 cities in Belgium with published data, ranked by total hardness. The national median is 31.6 °fH.

Belgian suppliers report hardness in °f (French degrees); 1 °f = 10 mg/L CaCO₃.

25 cities with the hardest water

#		°fH	mg/L
1	Blaugies · Hainaut	52.9	529	very hard
2	Soignies · Hainaut	52.3	523	very hard
3	Braine-le-Comte · Hainaut	50.6	506	very hard
4	Hennuyères · Hainaut	50.2	502	very hard
5	Virginal-Samme · Brabant wallon	50.2	502	very hard
6	Quenast · Brabant wallon	49.8	498	very hard
7	Rebecq-Rognon · Brabant wallon	49.8	498	very hard
8	Saintes · Brabant wallon	49.3	493	very hard
9	Oisquercq · Brabant wallon	48.9	489	very hard
10	Tubize · Brabant wallon	48.9	489	very hard
11	Houdeng-Aimeries · Hainaut	48	480	very hard
12	Neufvilles · Hainaut	47.9	479	very hard
13	Pâturages · Hainaut	47.6	476	very hard
14	Bierghes · Brabant wallon	47.5	475	very hard
15	Lettelingen · Hainaut	47.5	475	very hard
16	Dour · Hainaut	47.3	473	very hard
17	Élouges · Hainaut	47.3	473	very hard
18	Boussu · Hainaut	47.2	472	very hard
19	Hensies · Hainaut	47.2	472	very hard
20	Hornu · Hainaut	47.2	472	very hard
21	Saint-Ghislain · Hainaut	47.2	472	very hard
22	Wasmes · Hainaut	47.2	472	very hard
23	Wihéries · Hainaut	47.2	472	very hard
24	Trivières · Hainaut	47	471	very hard
25	Saint-Vaast · Hainaut	46.9	469	very hard