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| 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:
Notea: 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.
Note 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)
Note 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).
| 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/lmg/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 bahtor 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).
| 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-CoPlatinum 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).
