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: 27/08/2021 Sample Time: 09:30  
Human Activities: None Weather: Cloudy and Rainy. Water Body: Lake
Frequency Of Monitoring: Monthly Use Based Class: B Approximate Depth(Bottom/Table): 2.00 m 
Color & Intensity: Light Green and clear Odour: Odour Free Visible effluent discharge: None


Water Quality
Parameter Test Result Unit
  Ammonia-N   BDL   mg/l
  BOD   0.80   mg/l
  Conductivity   22.47   µs/cm
  Dissolved O2(DO)   7.60   mg/l
  Fecal Coliform   70   MPN/100ml
  Nitrate-N   0.07   mg/l
  pH   7.09   Unit
  Temperature(Water)   18   ⁰C
  Total Coliform   140   MPN/100ml
  Boron   0.29   mg/l
  Calcium   7.21   mg/l
  Chloride   1.96   mg/l
  COD   6.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   BDL   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.001   mg/l
  Potassium   BDL   mg/l
  Sodium   0.30   mg/l
  Sulphate   1.74   mg/l
  Total Alkalinity   36.00   mg/l
  Total Dissolved Solids(TDS)   10.00   mg/l
  Total Fixed Solids(TFS)   18.00   mg/l
  Total Hardness as CaCo3   18.00   mg/l
  Total Suspended Solids(TSS)   6.00   mg/l
  Turbidity   3.69   NTU