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Drinking Water Standards


Drinking Water Quality Standards
Properties Parameters Units Standards
Maximum Acceptable
Concentration
Maximum Allowable
Concentration
Physical Color Pt-Co 5 15
Taste - non objectionable non objectionable
Odor - non objectionable non objectionable
Turbidity SSU 5 20
pH - 6.5-8.5 9.2
Chemical Total Solids mg/dm3 500 1,500
Iron (Fe) mg/dm3 0.5 1.0
Manganese (Mn) mg/dm3 0.3 0.5
Fe & Mn mg/dm3 0.5 1.0
Copper (cu) mg/dm3 1.0 1.5
Zinc (Zn) mg/dm3 5.0 15.0
Calcium (Ca) mg/dm3 75b 200
Magnesium (Mg) mg/dm3 50 150
Sulphate (SO4) mg/dm3 200 250c
Chloride (Cl) mg/dm3 250 600
Fluroride (F) mg/dm3 0.7 1.0
Nitrate (NO3) mg/dm3 45 45
Alkylbenzyl
Sulfonates (ABS)
mg/dm3 0.5 1.0
Phenolic substance
(as phenol)
mg/dm3 0.001 0.002
Toxic elements Mercury (Hg) mg/dm3 0.002 -
Lead (Pb) mg/dm3 0.05 -
Arsenic (As) mg/dm3 0.05 -
Selenium (Se) mg/dm3 0.01 -
Chromium
(Cr hexavalent)
mg/dm3 0.05 -
Cyanide (CN) mg/dm3 0.2 -
Cadmium (Cd) mg/dm3 0.01 -
Barium (Ba) mg/dm3 1.0 -
Bacterial Standard plate
count
colonies/cm3 500 -
Total coliform MPN/100cm3 2.2 -
E.Coli MPN/100cm3 None -

Remarks: Pt-Co Platinum Cobalt Scale
SSU Silica Scale Unit
mg/dm3   milligram per cubic decimeter
MPN Most Probable Number
a These values are allowed for tap water or ground water that is used as temporary drinking water. Such water with a parameter between the maximum acceptable concentration and the maximum allowable concentration can not be certified as standard drinking water for industrial products and stamped with the standard logo.
b If the calcium concentration is higher than the standard and magnesium concentration is lower than the standard, calcium and magnesium will be identified in terms of total hardness with a standard value of less than 300 mg/dm3 (as CaCO3)
c If a sulphate concentration of 250 mg/dm3 is reached, magnesium concentration must not be more than 30 mg/dm3.

Source: Notification of the Ministry of Industry, No. 322, B.E. 2521 (1978), issued under the Industrial Products Standards Act B.E. 2511 (1968), published in the Royal Gazette, Vol. 95, Part 68, dated July 4, B.E. 2521 (1978).
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Bottled Drinking Water Quality Standard
Properties Parameters Units Maximum Allowable
Concentration
Physical Color Hazen 20
Odor - None
Turbidity SSU 5
pH - 6.5-8.5
Chemical Total Solids mg/l 500
Total hardness as Ca CO3 mg/l 100
Arsenic (As) mg/dm3 0.05
Barium (Ba) mg/dm3 1.0
Cadmium (Cd) mg/dm3 0.005
Chloride as Chlorine mg/dm3 250
Chromium (Cr) mg/dm3 0.05
Copper (cu) mg/dm3 1.0
Iron (Fe) mg/dm3 0.3
Lead (Pb) mg/dm3 0.05
Manganese (Mn) mg/dm3 0.05
Mercury (Hg) mg/dm3 0.002
Nitrate as Nitrogen (NO3 - N) mg/dm3 4.0
Phenol mg/dm3 0.001
Selenium (Se) mg/dm3 0.01
Silver (Ag) mg/dm3 0.05
Sulphate (SO4) mg/dm3 250
Zinc (Zn) mg/dm3 5.0
Fluoride as Fluorine (F) mg/dm3 1.5
Aluminium (Al) mg/dm3 0.2
Alkylbenzene Sulfonate mg/dm3 0.2
Cyanida (CN) mg/dm3 0.1
Bacterial Coliform MPN/100cm3 2.2
E.Coli MPN/100cm3 None
Disease causing bacteria MPN/100cm3 None

Remarks: mg/l   mg/dm3 (milligram per cubic decimeter)
Penalty: A licensee who does not comply with this notiifcation shall be subjected to imprisonment for a term not exceeding 2 years, or punished by fine not exceeding 20,000 baht  or both.
Source: Notification of the Ministry of Public Health, No. 61 B.E. 2524 (1981), issued under the Food Act B.E. 2522 (1979), published in the Royal Gazette, Vol. 98, Part 157 (Special Issue), dated September 24, B.E. 2524 (1981).
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Ground Water Quality Standards for Drinking Purposes
Properties Parameters Units Standards
Suitable Allowance Maximum Allowable
Physical Color Pt-Co 5 15
Turbidity JTU 5 20
pH - 7.0-8.5 6.5-9.2
Chemical Iron (Fe) mg/l 0.5 1.0
Manganese (Mn) mg/l 0.3 0.5
Copper (cu) mg/l 1.0 1.5
Zinc (Zn) mg/l 5.0 15.0
Sulphate (SO4) mg/l 200 250
Chloride (Cl) mg/l 250 600
Fluoride (F) mg/l 0.7 1.0
Nitrate (NO3) mg/l 45 45
Total hardness as CaCO3 mg/l 300 500
Non-Carbonate hardness
as CaCO3
mg/l 200 250
Total solids mg/l 600 1,200
Toxic elements Arsenic (As) mg/l None 0.05
Cyanide (CN) mg/l None 0.1
Lead (Pb) mg/l None 0.05
Mercury (Hg) mg/l None 0.001
Cadmium (Cd) mg/l None 0.001
Selenium (Se) mg/l None 0.01
Bacterial Standard plate
count
colonies/ml 500 -
Coliform bacteria MPN/100ml 2.2 -
E.Coli - None -

Remarks: Pt-Co  Platinum Cobalt Scale
 
Source: Notification of the Ministry of Industry, No. 4, B.E. 2521 (1978), issued under the Ground Water Act B.E. 2520 (1977), published in the Royal Gazette, Vol. 95, Part 66, dated June 27, B.E. 2521 (1978).



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