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: 11/07/2019 Sample Time: 14:00  
Human Activities: Fish Feeding and Horse Riding. Weather: Cloudy Water Body: Mirikh lake
Frequency Of Monitoring: Quarterly Use Based Class: C Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Muddy and Dark Brown Odour: Nauseating Visible effluent discharge: Moderate


Water Quality
Parameter Test Result Unit
  Conductivity   123.20   µs/cm
  Dissolved O2(DO)   7.20   mg/l
  Fecal Coliform   5000   MPN/100ml
  Nitrate-N   1.19   mg/l
  pH   6.90   Unit
  Temperature   18   ⁰C
  Total Coliform   11000   MPN/100ml
  Boron   0.013   mg/l
  Calcium   10.42   mg/l
  Chloride   20.54   mg/l
  COD   32.76   mg/l
  Fluoride   BDL   mg/l
  Magnesium   1.61   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.185   mg/l
  Potassium   1.10   mg/l
  Sodium   2.05   mg/l
  Sulphate   7.39   mg/l
  Total Alkalinity   66.00   mg/l
  Total Dissolved Solids(TDS)   110.00   mg/l
  Total Fixed Solids(TFS)   185.00   mg/l
  Total Hardness as CaCo3   31.62   mg/l
  Total Kjeldahl Nitrogen(TKN)      mg/l
  Total Suspended Solids(TSS)   182.00   mg/l
  Turbidity   65.30   NTU
  Ammonia-N   0.14   mg/l
  BOD   2.80   mg/l