Bakteriologie Beschaffenheit allgemein Anorganische Chemikalien Organik Desinfektionsmittel Pestizide Radioaktivität und weitere Stoffe
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General criteria 
 Anorganik
 Inorganics
 Organik
Organics
 Desinfektion
Desinfectants
 Pestizide
Pesticides
Radioaktivität
Radioactivity
 
Substances and parameters in drinking-water that may give rise
to complaints from consumers


  Levels likely to give rise to consumer complaintsa Reasons for consumer complaints
Physical parameters
colour 15 TCUb appearance
taste and odour should be acceptable
temperature should be acceptable
turbidity 5 NTUc appearance; for effective terminal disinfection, median turbidity =1 NTU, single sample =5 NTU
Inorganic constituents
aluminium 0.2 mg/l depositions, discoloration
ammonia 1.5 mg/l odour and taste
chloride 250 mg/l taste, corrosion
copper 1 mg/l staining of laundry and sanitary ware (health-based provisional guideline value 2 mg/litre)
hardness high hardness: scale deposition, scum formation
low hardness: possible corrosion
hydrogen sulfide 0.05 mg/l odour and taste
iron 0.3 mg/l staining of laundry and sanitary ware
manganese 0.1 mg/l staining of laundry and sanitary ware (health-based guideline value 0.5 mg/litre)
dissolved oxygen indirect effects
pH low pH: corrosion

high pH: taste, soapy feel

preferably <8.0 for effective disinfection with chlorine

sodium 200 mg/l taste
sulfate 250 mg/l taste, corrosion
total dissolved solids 1000 mg/l taste
zinc 3 mg/l appearance, taste
Organic constituents
toluene 24–170 µg/l odour, taste (health-based guideline value 700 µg/l)
xylene 20–1800 µg/l odour, taste (health-based guideline value 500 µg/l)
ethylbenzene 2–200 µg/l odour, taste (health-based guideline value 300 µg/l)
styrene 4–2600 µg/l odour, taste (health-based guideline value 20 µg/l)
monochlorobenzene 10–120 µg/l odour, taste (health-based guideline value 300 µg/l)
1,2-dichlorobenzene 1–10 µg/l odour, taste (health-based guideline value 1000 µg/l)
1,4-dichlorobenzene 0.3–30 µg/l odour, taste (health-based guideline value 300 µg/l)
trichlorobenzenes (total) 5–50 µg/l odour, taste (health-based guideline value 20 µg/l)
synthetic detergents foaming, taste, odour
Disinfectants and disinfectant by-products
chlorine 600–1000 µg/l taste and odour (health-based guideline value 5 µg/l)
chlorophenols    
2-chlorophenol 0.1–10 µg/l taste, odour
2,4-dichlorophenol 0.3–40 µg/l taste, odour
2,4,6-trichlorophenol 2–300 µg/l taste, odour (health-based guideline value 200 µg/l)

a The levels indicated are not precise numbers. Problems may occur at lower or higher values according to local circumstances. A range of taste and odour threshold concentrations is given for organic constituents.

b TCU, true colour unit.

c NTU, nephelometric turbidity unit.
 
 

 
 
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