Drinking Water Quality Standard in Thailand
| Properties |
Parameter |
Units |
Standards |
| Maximum Acceptable Concentration |
Maximum Allowable Concentration |
| Physical |
1. Colour |
Platinum-Cobalt
(Pt-Co) |
5 |
15 |
| 2. Taste |
– |
Non Objectionable |
Non Objectionable |
| 3. Odour |
– |
Non Objectionable |
Non Objectionable |
| 4. Turbidity |
Silica scale unit (SSU) |
5 |
20 |
| 5. pH |
– |
6.5 - 8.5 |
9.2 |
| Chemical |
6. Total Solids |
mg/dm³ |
500 |
1,500 |
| 7. Iron (Fe) |
mg/dm³ |
0.5 |
1.0 |
| 8. Manganese (Mn) |
mg/dm³ |
0.3 |
0.5 |
| 9. Iron & Manganese (Fe&Mn) |
mg/dm³ |
0.5 |
1.0 |
| 10. Copper (cu) |
mg/dm³ |
1.0 |
1.5 |
| 11. Zinc (Zn) |
mg/dm³ |
5.0 |
15.0 |
| 12. Calcium (Ca) |
mg/dm³ |
75b |
200 |
| 13. Magnesium (Mg) |
mg/dm³ |
50 |
150 |
| 14. Sulphate (SO4) |
mg/dm³ |
200 |
250c |
| 15. Chloride (Cl) |
mg/dm³ |
250 |
600 |
| 16. Fluroride (F) |
mg/dm³ |
0.7 |
1.0 |
| 17. Nitrate (NO3) |
mg/dm³ |
45 |
45 |
| 18. Alkylbenzyl Sulfonates (ABS) |
mg/dm³ |
0.5 |
1.0 |
| 19. Phenolic substance (as phenol) |
mg/dm³ |
0.001 |
0.002 |
| Toxic elements |
20. Mercury
(Hg) |
mg/dm³ |
0.001 |
– |
| 21. Lead (Pb) |
mg/dm³ |
0.05 |
– |
| 22. Arsenic (As) |
mg/dm³ |
0.05 |
– |
| 23. Selenium (Se) |
mg/dm³ |
0.01 |
– |
| 24. Chromium (Cr hexavalent) |
mg/dm³ |
0.05 |
– |
| 25. Cyanide (CN) |
mg/dm³ |
0.2 |
– |
| 26. Cadmium (Cd) |
mg/dm³ |
0.01 |
– |
| 27. Barium (Ba) |
mg/dm³ |
1.0 |
– |
| Bacterial |
28. Standard plate count |
Colonies/cm³ |
500 |
– |
| 29. Total coliform |
MPN/100cm³ |
< 2.2 |
– |
| 30. E.coli |
MPN/100cm³ |
None |
– |
| Remarks: |
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).
|
