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: 29/11/2019 Sample Time: 14:20 Hrs  
Human Activities: Fish feeding. Weather: Cloudy Water Body: Mirikh lake
Frequency Of Monitoring: Quarterly Use Based Class: C Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Dark Green and very Turbid. Odour: Fishy. Visible effluent discharge: Moderate.


Water Quality
Parameter Test Result Unit
  BOD   2.70   mg/l
  Fecal Coliform   2200   MPN/100ml
  Nitrate-N   1.37   mg/l
  pH   6.89   Unit
  Temperature   14   ⁰C
  Total Coliform   8000   MPN/100ml
  Boron   0.011   mg/l
  Calcium   13.60   mg/l
  Chloride   13.69   mg/l
  COD   38.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   2.88   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.018   mg/l
  Potassium   3.20   mg/l
  Sodium   6.80   mg/l
  Sulphate   8.85   mg/l
  Total Alkalinity   56.00   mg/l
  Dissolved O2(DO)   6.00   mg/l
  Conductivity   78.54   µs/cm
  Total Dissolved Solids(TDS)   78.00   mg/l
  Total Fixed Solids(TFS)   78.00   mg/l
  Total Hardness as CaCo3   44.00   mg/l
  Total Suspended Solids(TSS)   48.00   mg/l
  Turbidity   38.00   NTU
  Ammonia-N   BDL   mg/l