(1) Desirable: Less than 5 NTU
(2) Desirable: 6.5-8.5
(3) Desirable: 15 mg/l Pt-Co
(4) Desirable: less than 75 % of the saturation concentration
(5) Desirable: 150-500 mg/l
(6) Desirable: 0.3 mg/l
 ***  required but parameters have not been set

 WHO standardsEU standards
 

1993

1998

Suspended solids

***

***

COD

***

***

BOD

***

***

Oxidisability  

5.0 mg/l O2

Grease/oil

***

***

Turbidity

***

<5

pH

***

6.5 – 8.5

Conductivity

250 microS/cm

250 microS/cm
Color Pt-Co

***

15

Dissolved oxygen

***

>75% sat

Hardness CaCO3

***

150 – 500

TDS

***

***

     
cations    
(positive ions)    
Aluminium (Al)

0.2 mg/l

0.2 mg/l

Ammonia (NH4)

***

0.50 mg/l

Antimony (Sb)

0.005 mg/l

0.005 mg/l

Arsenic (As)

0.01 mg/l

0.01 mg/l

Barium (Ba)

0.3 mg/l

***

Berillium (Be)

***

***

Boron (B)

0.3 mg/l

1.00 mg/l

Bromate (Br)

***

0.01 mg/l

Cadmium (Cd)

0.003 mg/l

0.005 mg/l

Chromium (Cr)

0.05 mg/l

0.05 mg/l

Copper (Cu)

2 mg/l

2.0 mg/l

Iron (Fe)

No guideline(6)

0.2

Lead (Pb)

0.01 mg/l

0.01 mg/l

Manganese (Mn)

0.5 mg/l

0.05 mg/l

Mercury (Hg)

0.001 mg/l

0.001 mg/l

Molibdenum (Mo)

0.07 mg/l

***

Nickel (Ni)

0.02 mg/l

0.02 mg/l

Nitrogen (total N)

50 mg/l

***

Selenium (Se)

0.01 mg/l

0.01 mg/l

Silver (Ag)

No guideline

***

Sodium (Na)

200 mg/l

200 mg/l

Tin (Sn) inorganic

No guideline

***

Uranium (U)

1.4 mg/l

***

Zinc (Zn)

3 mg/l

***

     
anions    
(negative ions)    
Chloride (Cl)

250 mg/l

250 mg/l

Cyanide (CN)

0.07 mg/l

0.05 mg/l

Fluoride (F)

1.5 mg/l

1.5 mg/l

Sulfate (SO4)

500 mg/l

250 mg/l

Nitrate (NO3)

(See Nitrogen)

50 mg/l

Nitrite (NO2)

(See Nitrogen)

0.50 mg/l

     
microbiological    
parameters    
Escherichia coli ***

<1 in 250 ml

Enterococci

***

<1 in 250 ml

Pseudomonas aeruginosa

***

<1 in 250 ml

Clostridium  perfringens

***

<1 in 100 ml

Coliform bacteria

***

<1 in 100 ml

Colony count 22oC

***

<100 in 1 ml

Colony count 37oC

***

<20 in 1ml

     
other parameters    
Acrylamide

***

0.0001 mg/l

Benzene (C6H6)

***

0.001 mg/l

Benzo(a)pyrene

***

0.00001 mg/l

Chlorine dioxide (ClO2)

0.4 mg/l

 
1,2-dichloroethane

***

0.003 mg/l

Epichlorohydrin

***

0.0001 mg/l

Pesticides

***

0.0001 mg/l

Pesticides – Total

***

0.0005 mg/l

PAHs

***

0.0001 mg/l

Tetrachloroethene

***

0.01 mg/l

Trichloroethene

***

0.01 mg/l

Trihalomethanes

***

0.1 mg/l

Tritium (H3)

***

100 Bq/l

Vinyl chloride

***

0.0005 mg/l

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