West Bengal Pollution Control Board

Siliguri Laboratory

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



Station: River Torsa D/S of Ghughumari River Basin: GANGA CPCB Station Code: 4719
Sample Date: 20/01/2022 Sample Time: 12:55  
Human Activities: Boating Weather: Cloudy Water Body: Torsa
Frequency Of Monitoring: Monthly Use Based Class: B Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Light Green and moderately turbid Odour: Fishy Visible effluent discharge: None


Water Quality
Parameter Test Result Unit
  Ammonia-N   0.11   mg/l
  BOD   1.50   mg/l
  Conductivity   142.20   µs/cm
  Dissolved O2(DO)   7.40   mg/l
  Fecal Coliform   2100   MPN/100ml
  Fecal Streptococci   11   MPN/100ml
  Nitrate-N   0.03   mg/l
  pH   7.51   Unit
  Temperature(Water)   16   ⁰C
  Total Coliform   9000   MPN/100ml
  Boron   1.77   mg/l
  Calcium   27.25   mg/l
  Chloride   4.89   mg/l
  COD   30.00   mg/l
  Fluoride   0.14   mg/l
  Magnesium   13.24   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.001   mg/l
  Potassium   1.20   mg/l
  Sodium   1.30   mg/l
  Sulphate   7.42   mg/l
  Total Alkalinity   80.00   mg/l
  Total Dissolved Solids(TDS)   78.00   mg/l
  Total Fixed Solids(TFS)   44.00   mg/l
  Total Hardness as CaCo3   114.00   mg/l
  Total Suspended Solids(TSS)   57.00   mg/l
  Turbidity   9.94   NTU