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: 25/06/2021 Sample Time: 08:30  
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: Moderately green Odour: Odour Free Visible effluent discharge: None


Water Quality
Parameter Test Result Unit
  Ammonia-N   BDL   mg/l
  BOD   1.40   mg/l
  Conductivity   73.45   µs/cm
  Dissolved O2(DO)   7.80   mg/l
  Fecal Coliform   70   MPN/100ml
  Nitrate-N   0.09   mg/l
  pH   7.89   Unit
  Temperature(Water)   12   ⁰C
  Total Coliform   120   MPN/100ml
  Boron   0.20   mg/l
  Calcium   20.04   mg/l
  Chloride   4.89   mg/l
  COD   14.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   3.45   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.001   mg/l
  Potassium   BDL   mg/l
  Sodium   BDL   mg/l
  Sulphate   1.89   mg/l
  Total Alkalinity   58.00   mg/l
  Total Dissolved Solids(TDS)   14.00   mg/l
  Total Fixed Solids(TFS)   22.00   mg/l
  Total Hardness as CaCo3   62.00   mg/l
  Total Suspended Solids(TSS)   6.00   mg/l
  Turbidity   0.74   NTU