West Bengal Pollution Control Board

Siliguri Laboratory

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



Station: Water Reservior St. Helens School River Basin: GANGA CPCB Station Code: 4725
Sample Date: 16/07/2021 Sample Time: 11:00  
Human Activities: None Weather: Cloudy Water Body: Lake
Frequency Of Monitoring: Monthly Use Based Class: B Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Dark Green and clear. Odour: Odour Free Visible effluent discharge: None


Water Quality
Parameter Test Result Unit
  Magnesium   2.30   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.001   mg/l
  Potassium   BDL   mg/l
  Sodium   0.80   mg/l
  Sulphate   1.94   mg/l
  Total Alkalinity   74.00   mg/l
  Total Dissolved Solids(TDS)   12.00   mg/l
  Total Fixed Solids(TFS)   20.00   mg/l
  Total Hardness as CaCo3   44.00   mg/l
  Total Suspended Solids(TSS)   8.00   mg/l
  Turbidity   2.72   NTU
  Ammonia-N   BDL   mg/l
  BOD   1.00   mg/l
  Conductivity   18.14   µs/cm
  Dissolved O2(DO)   7.40   mg/l
  Fecal Coliform   80   MPN/100ml
  Nitrate-N   0.09   mg/l
  pH   6.86   Unit
  Temperature(Water)   16   ⁰C
  Total Coliform   170   MPN/100ml
  Boron   0.19   mg/l
  Calcium   14.43   mg/l
  Chloride   2.93   mg/l
  COD   8.00   mg/l
  Fluoride   BDL   mg/l