West Bengal Pollution Control Board

Siliguri Laboratory

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



Station: MIRIKH LAKE River Basin: Tista CPCB Station Code: 2520
Sample Date: 27/05/2022 Sample Time: 15:20  
Human Activities: Horse riding Weather: Rainy. Water Body: Mirikh lake
Frequency Of Monitoring: Quarterly Use Based Class: C Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Dark Green and turbid Odour: Fishy and Septic. Visible effluent discharge: Moderate


Water Quality
Parameter Test Result Unit
  Ammonia-N   0.93   mg/l
  BOD   1.80   mg/l
  Conductivity   138.00   µs/cm
  Dissolved O2(DO)   6.90   mg/l
  Fecal Coliform   2600   MPN/100ml
  Nitrate-N   5.56   mg/l
  pH   6.54   Unit
  Temperature(Water)   16   ⁰C
  Total Coliform   7000   MPN/100ml
  Boron   4.73   mg/l
  Calcium   12.80   mg/l
  Chloride   12.71   mg/l
  COD   38.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   4.37   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.009   mg/l
  Potassium   4.60   mg/l
  Sodium   11.10   mg/l
  Sulphate   4.48   mg/l
  Total Alkalinity   66.00   mg/l
  Total Dissolved Solids(TDS)   82.00   mg/l
  Total Fixed Solids(TFS)   20.00   mg/l
  Total Hardness as CaCo3   50.00   mg/l
  Total Suspended Solids(TSS)   17.00   mg/l
  Turbidity   12.60   NTU