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: 14/06/2022 Sample Time: 10:45  
Human Activities: None Weather: Cloudy and foggy 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   0.28   mg/l
  BOD   1.20   mg/l
  Conductivity   30.16   µs/cm
  Dissolved O2(DO)   8.20   mg/l
  Fecal Coliform   90   MPN/100ml
  Nitrate-N   0.14   mg/l
  pH   7.98   Unit
  Temperature(Water)   14   ⁰C
  Total Coliform   140   MPN/100ml
  Boron   3.81   mg/l
  Calcium   4.00   mg/l
  Chloride   0.97   mg/l
  COD   24.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   0.48   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.004   mg/l
  Potassium   0.70   mg/l
  Sodium   4.30   mg/l
  Sulphate   6.21   mg/l
  Total Alkalinity   18.00   mg/l
  Total Dissolved Solids(TDS)   16.00   mg/l
  Total Fixed Solids(TFS)   34.00   mg/l
  Total Hardness as CaCo3   12.00   mg/l
  Total Suspended Solids(TSS)   19.00   mg/l
  Turbidity   6.66   NTU