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Groundwater Quality Standards
Parameter
Unit
Standard Value
Analytical Methods
1. Volatile Organic Compound
1) Benzene

Microgram/litre


Not exceed 5


Purge and Trap Gas Chromatography or Purge and Trap Gas Chromatography/Mass Spectrometry or other methods approved by PCD

2) Carbon Tetrachloride
"
Not Exceed 5
"
3) 1, 2 - Dichloroethane
"
Not Exceed 5
"
4) 1,1-Dichloroethylene
"
Not exceed 7
"
5) cis-1,2-Dichloroethylene
"
Not exceed 70
"
6) trans-1,2-Dichloroethylene
"
Not exceed 100
"
7) Dichloromethane
"
Not exceed 5
"
8) Ethylbenzene
"
Not exceed 700
"
9) Styene
"
Not exceed 100
"
10) Tetrachoroetylene
"
Not exceed 5
"
11) Toluene
"
Not exceed 1,000
"
12) Trichloroethylene
"
Not exceed 5
"
13) 1,1,1-Trichloroethane
"
Not exceed 200
"
14) 1,1,2-Trichloroethane
"
Not exceed 5
"
15) Total Xylenes
"
Not exceed 10,000
"
2. Heavy metals
1) Cadmium

Milligram/litre

Not exceed 0.003
Direct Aspiration/Atomic Absorption Spectrometry or Inductively Coupled Plasma/Plasma Emission Spectroscopy or other methods approved by PCD
2) Hexavalent Chromium
"
Not exceed 0.05
"
3) Copper
"
Not exceed 1.0
"
4) Lead
"
Not exceed 0.01
"
5) Manganese
"
Not exceed 0.5
"
6) Nickel
"
Not exceed 0.02
"
7) Zinc
"
Not exceed 5.0
"
8) Arsenic
"
Not exceed 0.01
Hydride Generation/Atomic Absorption Spectrometry or Inductively Coupled Plasma/Plasma Emission Spectroscopy or other methods approved by PCD
9) Selenium
"
Not exceed 0.01
"
10) Mercury
"
Not exceed 0.001
Cold-Vapor Atomic Absorption Spectrometry/Plasma Emission Spectroscopy or other methods approved by PCD

3. Pesticides

1) Chlordane

 

Microgram/litre

 

Not exceed 0.2

 

Liquid - Liquid Extraction Gas Chromatography/Mass Spectrometry or Liquid - Liquid Extraction Gas Chromatography (Method I) or other methods approved by PCD

2) Dieldrin
"
Not exceed 0.03
"
3) Heptachlor
"
Not exceed 0.4
"
4) Heptachlor Epoxide
"
Not exceed 0.2
"
5) DDT
"
Not exceed 2
"
6) 2, 4 - D
"
Not exceed 30
Liquid-Liquid Extraction Gas Chromatography or other methods approved by PCD
7) Atrazine
"
Not exceed 3
"
8) Lindane
"
Not exceed 0.2
Liquid-Liquid Extraction Gas Chromatography (Method I) or other methods approved by PCD
9) Pentachlorophenol
"
Not exceed 1
Liquid - Liquid Extraction Chromatography or Liquid - Liquid Extraction Gas Chromatography/Mass Spectrometry or other methods approved by PCD

4. Others

1) Benzo (a) pyrene

 

Microgram/litre

 

Not exceed 0.2

 

Liquid - Liquid Extraction Chromatography or Liquid-Liquid Extraction Gas Chromatography/Mass Spectrometry or other methods approved by PCD

2) Cyanide
"
Not exceed 200
Pyridine Barbituric Acid or Colorimetry or Ion Chromatography or other methods approved by PCD
3) PCBs
"
Not exceed 0.5
Liquid - Liquid Extraction Gas Chromatography (Method II) or other methods approved by PCD
4) Vinyl Chloride "
Not exceed 2
Purge and Trap Gas Chromatography or Purge and Trap Gas Chromatography Mass Spectrometry or other methods approved by PCD

Remark

1. Standard Methods for the Examination of Water and Wastewater which American Public Health Association, American Water Works Association and the U.S.A. Water Environment Federation or Manual for Water and Wastewater Analysis of Thailand Environmental Engineering Association accept.

2. Methods for Sampling and Preservation follow as PCD Announcement in the Royal Government Gazette

Source : Notification of the National Environmental Board No. 20, B.E. 2543 (2000), issued under the Enhancement & Conservation of National Environment Quality Act B.E. 2535 (1992), published in the Royal Government Gazette, Vol. 117 Special part 95 D, dated September 15 , B.E. 2543 (2000)