Table 2.

The third level of the Groundwater Quality Standard (GB/T14848-2017)

ParametersConcentration (mg/l)ParametersConcentration (mg/l)ParametersConcentration (mg/l)
TDS≤1000NO2≤0.02SO42−≤250
Mn≤0.1NO3≤20Cl≤250
COD≤3.0F≤1.0Fe≤0.3
NH4+≤0.2

Note: Based on the third level of GB/T14848-2017 Standard for groundwater quality in China.