Appendix 2.2 - Drinking Water Quality Standard …

1 Appendix - Drinking Water Quality StandardTable 1 - Chemicals of Health Significance as described by World Health Organization Guidelines(WHO) for Drinking - Water Quality in third edition (2008) and fourth edition (2011)ParameterUnitWHO 3rdedition (2008)GuidelineValueParameterUnitLatestW HO 4thedition (2011)GuidelineValueAcrylamide g/L20 Alachlor g/L20 Aldicarb g/L10 Aldicarb g/L10 Aldrin and Dieldrin and Dieldrin (P) (A,T)Atrazine g/L2 Atrazine and its chloro-s-triazine metabolites g/L100 g/L10 Benzene g/L10 Benzo[a]pyrene [a]pyrene (T) g/L10 (A,T)Bromate g/L10 (A,T)Bromodichloromethane g/L60 Bromodichloromethane g/L60 Bromoform g/L100 Bromoform g/L100 g/L7 Carbofuran g/L7 Carbon tetrachloride g/L4 Carbon tetrachloride g/L4 Chlorate g/L700 (D)Chlorate g/L700 (D)Chlordane (C)Chlorinemg/L5 (C)Chlorite g/L700 (D)Chlorite g/L700 (D)Chloroform g/L300 Chloroform g/L300 Chlorotoluron g/L30 Chlorotoluron g/L30 Chlorpyrifos g/L30 Chlorpyrifos g/L30 (P) (P)Coppermg/L2 Coppermg/L2 Cyanazine ,4-D (2,4-dichlorophenoxyaceticacid) g/L302,4-D (2,4-dichlorophenoxyaceticacid) g/L302,4-DB (2,4-dichlorophenoxybutyricacid) g/L902,4-DB (2,4-dichlorophenoxybutyricacid) g/L90 DDT(Dichlorodiphenyltrichlorethane) and metabolites g/L1 DDT(Dichlorodiphenyltrichlorethane) and metabolites g/L1Di(2-ethylhexyl)phthalate g/L8Di(2-ethylhexyl)phthalate g/L8 Dibromoacetonitrile g/L70 Dibromoacetonitrile g/L70 Dibromochloromethane g/L100 Dibromochloromethane g/L1001,2-Dibromo-3-chloropropane g/L11,2-Dibromo-3-chloropropane g/L11,2-Dibromoethane (P)1,2-Dibromoethane (P)Dichloroacetate g/L50 (T,D)Dichloroacetate g/L50 (D)Dichloroacetonitrile g/L20 (P)

2 Dichloroacetonitrile g/L20 (P)1,2-Dichlorobenzene g/L1000 (C)1,2-Dichlorobenzene g/L1000 (C)1,4-Dichlorobenzene g/L300 (C)1,4-Dichlorobenzene g/L300 1,2-Dichloroethane g/L301,2-Dichloroethane g/L301,2-Dichloroethene g/L501,2-Dichloroethene g/L50 Dichloromethane g/L20 Dichloromethane g/L201,2-Dichloropropane g/L40 (P)1,2-Dichloropropane g/L40 (P)1,3-Dichloropropene g/L201,3-Dichloropropene g/L20 Dichlorprop g/L100 Dichlorprop g/L100 Dimethoate g/L6 Dimethoate g/L61,4-Dioxane g/L501,4-Dioxane g/L50 Edetic acid (EDTA) g/L600 Edetic acid g/L600 Endrin (P)Epichlorohydrin (P)Ethylbenzene g/L300 (C)Ethylbenzene g/L300 (C)Fenoprop g/L9 Fenoprop g/L9 g/L200 Isoproturon g/L9 Isoproturon g/L9 (A,T)Lindane g/L2 Lindane g/L2 (C)---MCPA (4-(2-Methyl-4-chlorophenoxy) aceticacid) g/L2 MCPA (4-(2-Methyl-4-chlorophenoxy) aceticacid) g/L2 Mecoprop g/L10 Mecoprop g/L10 g/L20 Methoxychlor g/L20 Metolachlor g/L10 Metolachlor g/L10 Microcystin-LR g/L1 (P)Microcystin-LR g/L1 (P)Molinate g/L6 Molinate g/L6 g/L20 Monochloroacetate g/L20 (as NO3-)mg/L50 Nitrate (as NO3-)mg/L50 Nitrilotriacetic acid(NTA) g/L200 Nitrilotriacetic acid g/L200 Nitrite (as NO2-)mg/L3 Nitrite (as NO2-)mg/L3N-Nitrosodimethylamine(NDMA) g/L100N-Nitrosodimethylamine g/L20 Pendimethalin g/L20 Pentachlorophenol g/L9 (P)Pentachlorophenol g/L9 (P)Permethrin g/L300---Pyriproxyfen g/L300--- (P)Simazine g/L2 Simazine g/L2 Sodiumdichloroisocyanurate (ascyanuric acid)mg/L40 Sodiumdichloroisocyanurate(as cyanuric acid)mg/L40 Styrene g/L20 (C)Styrene g/L20 (C)2,4,5-T g/L92,4,5-T (2,4,5-trichlorophenoxy aceticacid)

3 G/L9 Terbuthylazine g/L7 Terbuthylazine g/L7 Tetrachloroethene g/L40 Tetrachloroethene g/L40 Toluene g/L700 (C)Toluene g/L700 (C)Trichloroacetate g/L200 Trichloroacetate g/L200 Trichloroethene g/L20 (P)Trichloroethene g/L20 (P)2,4,6-Trichlorophenol g/L200 (C)2,4,6-Trichlorophenol g/L200 (C)Trifluralin g/L20 Trifluralin g/L20 Trihalomethanes-The sum of theratio of theconcentration ofeach to itsrespectiveguideline valueshould notexceed 1 TrihalomethanesThe sum of theratio of theconcentration ofeach to itsrespectiveguideline valueshould notexceed 1 (P,T) (P)Vinyl chloride chloride g/L500 (C)Xylenes g/L500 (C)Note:1. According to WHO Drinking - Water Quality 3rdedition (2008):P=provisional guideline value,as there is evidence of a hazard, butthe available information on healtheffects is limited;T=provisional guideline valuebecausecalculated guideline value is below the level that can be achievedthrough practical treatment methods, source protection, etc;A=provisional guideline valuebecausecalculated guideline value is below the achievable quantificationleve l;D=provisional guideline valuebecausedisinfectionis likely toresult in the guideline value beingexceeded.

4 C=concentrations of the substance at or below the health-based guideline value may affect theappearance, taste or odour of the Water , leading to consumer According to WHO Drinking - Water Quality 4th edition (2011):A=Provisional guideline value because calculated guideline value is below the achievable quantificationleve l;C=Concentrations of the substance at or below the health-based guideline value may affect theappearance, taste or odour of the Water , leading to consumer complaints;D=Provisional guideline value because disinfection is likely to result in the guideline value beingexceeded;P=Provisional guideline value because of uncertainties in the health database;T=Provisional guideline value because calculated guideline value is below the level that can be achievedthrough practical treatment methods, source protection, - Drinking Water Quality StandardTable 2 - Other Water Quality ParametersParameterExisting StandardParameterStandard for theReprovisioned Sha TinWTW South WorkspH at 25 at 25 exceeding 5 HazenunitsColourNot exceeding 5 HazenunitsTurbidityNot exceeding NTUT urbidityNot exceeding NTU,and not exceeding NTUin 95% of daily samples inany monthIron as FeNot exceeding mg/LIron as FeNot exceeding mg/LManganese as Mn Not exceeding mg/LManganese asMnNot exceeding mg/LAluminium as AlNot exceeding mg/L Aluminium as AlNot exceeding mg/LFree - mg/LFree - mg/LFluoride as F 10% of norminal level(current mg/L)

5 Fluoride as F 10% of norminal level(current mg/L)Taste and odourUnobjectionableTaste and odour UnobjectionableTotal Coliforms & ( )AbsentTotal Coliforms & ( )Absent--Cryptosporidium4-log ( ) reduction orinactivation--Giardia4-log ( ) reduction orinactivation--Viruses4-log ( ) reduction orinactivatio