Table 1.

Comparison of water composition by country in the United Kingdom.

Country	Median Total Hardness/mg/L [Range]	Median Calcium Concentration/mg/L [Range]	Median Magnesium Concentration/mg/L [Range]	Median Sodium Concentration/mg/L [Range]	Median Sulphate Concentration/mg/L [Range]
England	192.90 [19.00–331.50]	77.56 [6.73–128.00]	4.65 [1.30–31.80]	17.90 [2.98–57.80]	37.00 [7.95–112.43]
Scotland	32.87 [16.02–52.38]	10.69 [5.35–17.73]	1.59 [0.65–2.02]	6.39 [3.93–8.23]	9.07 [2.86–18.38]
Wales	68.93 [26.15–124.29]	26.83 [8.98–36.93]	3.88 [0.59–7.14]	10.93 [5.99–22.70]	6.74 [6.74–37.30]
Northern Ireland	100.95 [24.40–141.50]	31.50 [8.60–56.60]	5.35 [0.70–8.90]	N.D.	N.D.
Total	120.59 [16.02–331.50]	30.46 [5.35–128.00]	3.62 [0.59–31.80]	14.72 [2.98–57.80]	25.36 [2.86–112.43]

N.D. denotes no data available.