Table 3.

Comparison of water composition by region in England.

Region	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 Sulfate Concentration/mg/L [Range]
East	269.00 [182.28–331.50)	104.90 [78.10–128.00]	8.74 [2.07–17.10]	28.40 [10.10–57.80]	59.79 [20.00–111.00]
East Midlands	165.90 [148.25–192.80]	59.30 [59.30–59.30]	31.80 [31.80–31.80]	29.80 [25.00–37.00]	64.00 [50.00–87.60]
London	272.00 [271.00–273.00]	N.D.	4.30 [4.20–4.30]	28.60 [27.60–29.60]	47.35 [46.40–48.30]
North East	116.88 [50.03–277.43]	38.05 [16.67–77.01]	5.29 [2.03–28.33]	17.33 [7.98–43.35]	61.35 [29.87–112.43]
North West	70.00 [19.00–109.00]	17.90 [6.73–33.60]	2.49 [1.30–6.13]	14.50 [2.98–19.00]	26.10 [7.95–42.80]
South East	285.75 [257.00–302.00]	104.72 [97.00–112.43]	4.80 [3.00–7.98]	14.93 [9.03–42.90]	20.29 [12.91–109.00]
South West	185.30 [39.98–33-.38]	97.085 [62.00–119.66]	6.30 [4.50–8.10]	10.60 [8.20–45.30]	14.60 [9.00–86.00]
West Midlands	156.25 [51.10–212.40]	27.58 [27.58–27.58]	3.10 [3.10–3.10]	16.60 [11.10–35.90]	34.65 [21.00–64.00]
Total	192.80 [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]

N.D. denotes no data available.