Whilst surfing the internet I happened across the following site:

http://www.unitedutilities.co.uk/waterqualitydetail.htm

Only really usefull for UK Scrubbers but once you put in your postcode and click get detailed report you get the following information:

Parameter Min Average Max Units Regulatory standard Number of samples % failed
2,4,5-T <0.0100 <0.0106 <0.0148 g/l 0.1 56 0.00
2,4-D <0.0100 <0.0100 <0.0100 g/l 0.1 57 0.00
2,4-DB <0.0100 <0.0104 <0.0135 g/l 0.1 57 0.00
Aldrin <0.0020 <0.0020 <0.0030 g/l 0.03 70 0.00
Aluminium <3.39 <22.2 71.7 g Al/l 200 37 0.00
Ammonium (ammonia and ammonium ions) <0.0231 <0.0292 <0.0328 mg NH4/l 0.5 35 0.00
Antimony 0.100 0.126 0.160 g Sb/l 5 7 0.00
Arsenic 0.160 0.204 0.250 g As/l 10 7 0.00
Asulam <0.0100 <0.0100 <0.0100 g/l 0.1 28 0.00
Atrazine <0.0100 <0.0100 <0.0100 g/l 0.1 1 0.00
Benzene <0.0311 <0.0327 <0.0349 g/l 1 53 0.00
Benzo(a)pyrene <0.0010 <0.0054 0.0300 g/l 0.01 8 12.50
Boron 0.0021 0.0056 0.0153 mg B/l 1 56 0.00
Bromate 0.930 2.07 3.05 g BrO3/l 10 8 0.00
Bromoxynil <0.0100 <0.0100 <0.0100 g/l 0.1 32 0.00
Cadmium <0.0200 <0.0271 <0.0400 g Cd/l 5 7 0.00
Calcium 3.70 5.83 8.33 mg Ca/l 37 0.00
Carbendazim <0.0100 <0.0100 <0.0100 g/l 0.1 60 0.00
Carbofuran <0.0100 <0.0100 <0.0100 g/l 0.1 23 0.00
Chloride 5.04 9.19 24.5 mg Cl/l 250 52 0.00
Chromium <0.160 <0.179 0.210 g Cr/l 50 7 0.00
Residual chlorine - Total 0.25 0.62 0.96 mg/l 96 0.00
Residual chlorine - Free 0.21 0.58 0.92 mg/l 96 0.00
Chlortoluron <0.0100 <0.0100 <0.0100 g/l 0.1 57 0.00
Colony Counts after 2 days at 37 deg C 0 0 1 number/1ml 36 0.00
Colony counts after 3 days at 22 deg C 0 1 10 number/1ml 36 0.00
Coliform bacteria 0 0 0 number/100ml 0 96 0.00
Colour 0.420 1.01 1.84 mg/l Pt/Co scale 20 38 0.00
Conductivity 69.0 93.4 106 uS/cm at 20oC 2500 20 0.00
Copper 0.0018 0.0139 0.0453 mg Cu/l 2 7 0.00
Clostridium perfringens (including spores) 0 0 0 number/100ml 0 36 0.00
Clopyralid <0.0100 <0.0100 <0.0100 g/l 0.1 1 0.00
Cyanide <0.540 <0.790 1.86 g CN/l 50 56 0.00
Cyanazine <0.0100 <0.0100 <0.0100 g/l 0.1 57 0.00
1,2-dichloroethane <0.0753 <0.0870 <0.103 g/l 3 53 0.00
Diazinon <0.0100 <0.0100 <0.0100 g/l 0.1 1 0.00
Dicamba <0.0100 <0.0100 <0.0100 g/l 0.1 58 0.00
Dieldrin <0.0020 <0.0030 <0.0030 g/l 0.03 70 0.00
Dichlorprop <0.0100 <0.0100 <0.0100 g/l 0.1 56 0.00
Diuron <0.0100 <0.0100 <0.0100 g/l 0.1 57 0.00
E.coli 0 0 0 number/100ml 0 96 0.00
Ethofumesate <0.0100 <0.0114 <0.0161 g/l 0.1 56 0.00
Enterococci 0 0 0 number/100ml 0 8 0.00
Fluoride <0.0300 <0.0300 0.0300 mg F/l 1.5 7 0.00
Fluroxypyr <0.0100 <0.0100 <0.0100 g/l 0.1 33 0.00
Glyphosate <0.0060 <0.0069 <0.0140 g/l 0.1 31 0.00
Total hardness 7 9 10 mg Ca/l 37 0.00
Heptachlor epoxide <0.0020 <0.0030 <0.0030 g/l 0.03 73 0.00
Heptachlor <0.0010 <0.0010 <0.0020 g/l 0.03 70 0.00
Ioxynil <0.0100 <0.0106 <0.0145 g/l 0.1 57 0.00
Iron <1.30 <6.87 41.2 g Fe/l 200 37 0.00
Isoproturon <0.0100 <0.0100 <0.0100 g/l 0.1 57 0.00
Lead <0.120 <0.539 1.17 g Pb/l 25 7 0.00
Lindane <0.0100 <0.0100 <0.0100 g/l 0.1 57 0.00
Linuron <0.0100 <0.0100 <0.0100 g/l 0.1 57 0.00
Magnesium 1.00 1.71 2.10 mg Mg/l 37 0.00
Manganese 0.480 0.930 2.30 g Mn/l 50 37 0.00
MCPA <0.0100 <0.0100 <0.0100 g/l 0.1 57 0.00
MCPB <0.0100 <0.0102 <0.0119 g/l 0.1 32 0.00
Mecoprop <0.0100 <0.0100 <0.0100 g/l 0.1 57 0.00
Mercury <0.0100 <0.0187 <0.127 g Hg/l 1 55 0.00
Nickel <0.500 <1.11 1.40 g Ni/l 20 7 0.00
Nitrite <0.0033 <0.0046 <0.0053 mg NO2/l 0.5 35 0.00
Nitrate 0.886 1.35 1.99 mg NO3/l 50 35 0.00
(Nitrate)/50 plus (nitrite)/3 0.0170 0.0269 0.0400 mg/l 1 35 0.00
Odour (quantitative) 0 0 0 dilution number at 25oC 0 18 0.00
Total organic carbon 0.800 1.17 2.31 mg C/l 57 0.00
Polycyclic aromatic hydrocarbons (sum of 4 PAHs) 0.0000 0.0104 0.0830 g/l 0.1 8 0.00
Pesticides - Total 0.0000 0.0000 0.0000 g/l 0.5 1 0.00
Hydrogen ion (pH) 7.01 7.35 8.20 pH value 9.5 72 0.00
Propetamphos <0.0100 <0.0100 <0.0100 g/l 0.1 49 0.00
Propyzamide <0.0100 <0.0100 <0.0100 g/l 0.1 19 0.00
Radioactivity gross alpha 0.0120 0.0254 0.0530 Bq/l 0.1 18 0.00
Radioactivity gross beta 0.0940 0.142 0.207 Bq/l 1 18 0.00
Selenium <0.210 <0.401 0.570 g Se/l 10 7 0.00
Simazine <0.0100 <0.0100 <0.0100 g/l 0.1 1 0.00
Sodium 4.69 10.5 13.7 mg Na/l 200 37 0.00
Sulphate 6.59 14.3 92.6 mg SO4/l 250 56 0.00
Taste (quantitative) 0 0 0 dilution number at 25oC 0 18 0.00
Tetrachloromethane <0.0196 <0.0333 0.0500 g/l 3 9 0.00
Trihalomethanes - Total 20.2 28.0 37.8 g/l 100 9 0.00
Triclopyr <0.0100 <0.0107 <0.0155 g/l 0.1 56 0.00
Triforine <0.0100 <0.0100 <0.0100 g/l 0.1 56 0.00
Tetrachloroethene and trichloroethene 0.0000 0.0033 0.0300 g/l 10 9 0.00
Turbidity <0.04 <0.12 0.34 NTU 4 38 0.00

The report details drinking water quality for the last 12 months. The information is updated weekly and complies with regulation 35 (2) of the Water Supply (Water Quality) Regulations 2000.
Bit in depth I know, but if you are making your own water for top up etc it is good to know whats in there in the first place! :lol: