Establishment of Environmental Quality Standards for Groundwater
Environmental Quality Standards(EQS) for groundwater pollution were issued in
1997.
Environmental Quality Standards for groundwater are required to be maintained in
order to protect human health.
As a result of additions made in February 1999, EQS now regulate 26 substances
including cadmium etc.
| Item | Standard Values |
| cadmium | 0.01mg/liter or less |
| total cyanogen | inno detectable amounts |
| lead | 0.01mg/liter or less |
| chromium (VI) | 0.05mg/liter or less |
| arsenic | 0.01mg/liter or less |
| total mercury | 0.0005mg/liter or less |
| alkyl mercury | inno detectable amounts |
| PCB | in nodetectable amounts |
| dichloromethane | 0.02mg/liter or less |
| carbon tetrachloride | 0.002mg/liter or less |
| 1,2-dichloroethane | 0.004mg/liter or less |
| 1,1-dichloroethylene | 0.02mg/liter or less |
| cis1,2-dichloroethylene | 0.04 mg/liter or less |
| 1,1,1-trichloroethane | 1.0mg/liter or less |
| 1,1,2-trichloroethane | 0.006mg/liter or less |
| trichloroethylane | 0.03mg/liter or less |
| tetrachloroethylene | 0.01mg/liter or less |
| 1,3-dichloro propane | 0.002mg/liter or less |
| thiram | 0.006mg/liter or less |
| simazine | 0.003mg/liter or less |
| thiobencarb | 0.02mg/liter or less |
| benzene | 0.01mg/liter or less |
| selenium | 0.01mg/liter or less |
| nitrate nitrogen and nitrite nitrogen | 10 mg/liter or less |
| fluoride | 0.8 mg/liter or less |
| boron | 1 mg/liter or less |