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: 25/10/2019 Sample Time: 14:05  
Human Activities: Fish Feeding and Horse Riding. Weather: Clear and Sunny Water Body: Mirikh lake
Frequency Of Monitoring: Quarterly Use Based Class: C Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Dark Green and Muddy Odour: Rotten eggs Visible effluent discharge: Moderate


Water Quality
Parameter Test Result Unit
  Ammonia-N   BDL   mg/l
  Turbidity   2.88   NTU
  Total Suspended Solids(TSS)   62.00   mg/l
  Sulphate   8.67   mg/l
  Total Coliform   9000   MPN/100ml
  Boron   0.008   mg/l
  Dissolved O2(DO)   6.80   mg/l
  Fecal Coliform   3300   MPN/100ml
  Nitrate-N   0.86   mg/l
  pH   6.80   Unit
  Calcium   12.83   mg/l
  COD   32.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   3.26   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Total Alkalinity   36.00   mg/l
  Phosphate-P   0.027   mg/l
  Potassium   2.50   mg/l
  Total Fixed Solids(TFS)   68.00   mg/l
  Total Hardness as CaCo3   46.00   mg/l
  Temperature   13   ⁰C
  BOD   2.80   mg/l
  Chloride   13.70   mg/l
  Total Dissolved Solids(TDS)   106.00   mg/l
  Conductivity   119.00   µs/cm
  Sodium   2.30   mg/l