West Bengal Pollution Control Board

Siliguri Laboratory

Paribesh Bhawan, Paribahan Nagar, P.O. Matigara, Siliguri,Darjeeling 734 428.



Station: River Torsa at Hasimara River Basin: GANGA CPCB Station Code: 4724
Sample Date: 15/09/2021 Sample Time: 16:30  
Human Activities: Bathing and Washing and Fishing. Weather: Sunny and Clear. Water Body: Torsa
Frequency Of Monitoring: Monthly Use Based Class: B Approximate Depth(Bottom/Table): 1.50 m 
Color & Intensity: Moderately Brown and turbid Odour: Fishy Visible effluent discharge: None


Water Quality
Parameter Test Result Unit
  Ammonia-N   0.22   mg/l
  BOD   1.50   mg/l
  Conductivity   73.75   µs/cm
  Dissolved O2(DO)   7.80   mg/l
  Fecal Coliform   2200   MPN/100ml
  Fecal Streptococci   11   MPN/100ml
  Nitrate-N   0.07   mg/l
  pH   7.46   Unit
  Temperature(Water)   26   ⁰C
  Total Coliform   5000   MPN/100ml
  Boron   1.68   mg/l
  Calcium   21.64   mg/l
  Chloride   2.95   mg/l
  COD   20.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   2.30   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.002   mg/l
  Potassium   0.80   mg/l
  Sodium   0.60   mg/l
  Sulphate   2.36   mg/l
  Total Alkalinity   30.00   mg/l
  Total Dissolved Solids(TDS)   16.00   mg/l
  Total Fixed Solids(TFS)   332.00   mg/l
  Total Hardness as CaCo3   62.00   mg/l
  Total Suspended Solids(TSS)   165.00   mg/l
  Turbidity   186.00   NTU