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: 06/11/2020 Sample Time: 11:30  
Human Activities: Bathing and Washing and Fishing. 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 turbid Odour: Fishy Visible effluent discharge: Moderate


Water Quality
Parameter Test Result Unit
  Total Coliform   5000   MPN/100ml
  Turbidity   2.25   NTU
  Ammonia-N   0.14   mg/l
  Temperature(Water)   14   ⁰C
  Boron   2.52   mg/l
  Calcium   7.21   mg/l
  BOD   2.40   mg/l
  Potassium   2.60   mg/l
  Total Hardness as CaCo3   40.00   mg/l
  Chloride   30.33   mg/l
  COD   48.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   5.18   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.014   mg/l
  Sodium   5.80   mg/l
  Sulphate   18.21   mg/l
  Total Alkalinity   36.00   mg/l
  Total Dissolved Solids(TDS)   124.00   mg/l
  Total Fixed Solids(TFS)   84.00   mg/l
  Total Suspended Solids(TSS)   50.00   mg/l
  Conductivity   66.02   µs/cm
  Dissolved O2(DO)   6.20   mg/l
  Fecal Coliform   1700   MPN/100ml
  Nitrate-N   0.026   mg/l
  pH   7.20   Unit