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: 22/07/2022 Sample Time: 09:45  
Human Activities: None Weather: Cloudy,Foggy and Rainy. Water Body: Lake
Frequency Of Monitoring: Monthly Use Based Class: B Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Light Green and Clear Odour: Fishy Visible effluent discharge: None


Water Quality
Parameter Test Result Unit
  Ammonia-N   BDL   mg/l
  BOD   1.90   mg/l
  Conductivity   23.84   µs/cm
  Dissolved O2(DO)   6.30   mg/l
  Fecal Coliform   90   MPN/100ml
  Nitrate-N   0.02   mg/l
  pH   7.90   Unit
  Temperature(Water)   12   ⁰C
  Total Coliform   220   MPN/100ml
  Boron   1.59   mg/l
  Calcium   4.00   mg/l
  Chloride   1.95   mg/l
  COD   17.00   mg/l
  Fluoride   0.27   mg/l
  Magnesium   0.48   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   BDL   mg/l
  Potassium   0.80   mg/l
  Sodium   2.50   mg/l
  Sulphate   5.39   mg/l
  Total Alkalinity   14.00   mg/l
  Total Dissolved Solids(TDS)   10.00   mg/l
  Total Fixed Solids(TFS)   16.00   mg/l
  Total Hardness as CaCo3   12.00   mg/l
  Total Suspended Solids(TSS)   7.00   mg/l
  Turbidity   3.02   NTU