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: 18/09/2020 Sample Time: 12:00 Hrs  
Human Activities: None Weather: Cloudy and Raining. 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: Nauseating Visible effluent discharge: none


Water Quality
Parameter Test Result Unit
  Ammonia-N   0.22   mg/l
  BOD   2.60   mg/l
  Conductivity   64.42   µs/cm
  Dissolved O2(DO)   5.90   mg/l
  Fecal Coliform   3400   MPN/100ml
  Nitrate-N   2.39   mg/l
  Boron   1.69   mg/l
  Calcium   7.21   mg/l
  COD   52.00   mg/l
  pH   7.50   Unit
  Magnesium   5.18   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.024   mg/l
  Potassium   2.80   mg/l
  Sodium   5.80   mg/l
  Sulphate   16.00   mg/l
  Total Alkalinity   36.00   mg/l
  Total Fixed Solids(TFS)   24.00   mg/l
  Total Hardness as CaCo3   36.00   mg/l
  Turbidity   9.19   NTU
  Temperature(Water)   14   ⁰C
  Total Coliform   17000   MPN/100ml
  Total Dissolved Solids(TDS)   90.00   mg/l
  Chloride   6.84   mg/l
  Total Suspended Solids(TSS)   89.00   mg/l
  Fluoride   0.35   mg/l