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: 20/01/2021 Sample Time: 16:00  
Human Activities: None. Weather: Cloudy and foggy 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: None Visible effluent discharge: Moderate


Water Quality
Parameter Test Result Unit
  Ammonia-N   0.24   mg/l
  BOD   2.10   mg/l
  Magnesium   5.18   mg/l
  Conductivity   127.00   µs/cm
  Total Dissolved Solids(TDS)   84.00   mg/l
  Dissolved O2(DO)   6.70   mg/l
  Fecal Coliform   2100   MPN/100ml
  Nitrate-N   0.136   mg/l
  pH   7.1   Unit
  Temperature(Water)   11   ⁰C
  Total Coliform   5000   MPN/100ml
  Boron   2.81   mg/l
  Calcium   7.21   mg/l
  Chloride   6.84   mg/l
  COD   38.00   mg/l
  Fluoride   0.16   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.004   mg/l
  Potassium   1.50   mg/l
  Sodium   5.80   mg/l
  Sulphate   11.14   mg/l
  Total Alkalinity   36.00   mg/l
  Total Fixed Solids(TFS)   40.00   mg/l
  Total Hardness as CaCo3   36.00   mg/l
  Total Suspended Solids(TSS)   38.00   mg/l
  Turbidity   19.70   NTU