Ground Water Quality (Manual - Chemical Parameters), Central Ground Water Board (CGWB)—Ground Water Quality Manual Chemical Parameters CGWB Tamil Nadu (1961-2025)

_id	SlNo	Station	Agency	State LGD Code	State	District LGD Code	District	Tehsil	Block	Village	River	Basin	Tributary	Subtributary	SubSubtributary	Local River	Latitude	Longitude	Data Acquisition Time	Potential of Hydrogen (pH)	Electric Conductivity (I 1/4 S/cm)	Total Dissolved Solids (mg/L)	Carbonate (mg/L)	Bicarbonate (mg/L)	Total Alkalinity (mg/L as CaCO3)	Chloride (mg/L)	Nitrate N (mgN/L)	Sulphate (mg/L)	Phosphate(mg/L)	Silica(mg/L)	Fluoride (mg/L)	Total Hardness (mgCaCO3/L)	Calcium (mg/L)	Magnesium (mg/L)	Sodium (mg/L)	Potassium (mg/L)	Iron(mg/L)	Arsenic (mg/L)	Uranium(mg/L)	Manganese (mg/L)	Copper (mg/L)	Lead (mg/L)	Zinc (mg/L)	Nickel (mg/L)	Cadmium (mg/L)	Chromium (mg/L)	colspacer
	SlNo	Station	Agency	State LGD Code	State	District LGD Code	District	Tehsil	Block	Village	River	Basin	Tributary	Subtributary	SubSubtributary	Local River	Latitude	Longitude	Data Acquisition Time	Potential of Hydrogen (pH)	Electric Conductivity (I 1/4 S/cm)	Total Dissolved Solids (mg/L)	Carbonate (mg/L)	Bicarbonate (mg/L)	Total Alkalinity (mg/L as CaCO3)	Chloride (mg/L)	Nitrate N (mgN/L)	Sulphate (mg/L)	Phosphate(mg/L)	Silica(mg/L)	Fluoride (mg/L)	Total Hardness (mgCaCO3/L)	Calcium (mg/L)	Magnesium (mg/L)	Sodium (mg/L)	Potassium (mg/L)	Iron(mg/L)	Arsenic (mg/L)	Uranium(mg/L)	Manganese (mg/L)	Copper (mg/L)	Lead (mg/L)	Zinc (mg/L)	Nickel (mg/L)	Cadmium (mg/L)	Chromium (mg/L)