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: 26/02/2020 Sample Time: 16:30 hrs  
Human Activities: None Weather: Clear and Sunny Water Body: Mirikh lake
Frequency Of Monitoring: Quarterly Use Based Class: C Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Dark Green and Highly Turbid Odour: Nauseating Visible effluent discharge: Moderate


Water Quality
Parameter Test Result Unit
  Dissolved O2(DO)   5.40   mg/l
  Fecal Coliform   900   MPN/100ml
  Ammonia-N   0.98   mg/l
  Nitrate-N   0.81   mg/l
  pH   7.54   Unit
  BOD   2.80   mg/l
  Temperature   10   ⁰C
  Total Coliform   2200   MPN/100ml
  Boron   7.29   mg/l
  Calcium   10.42   mg/l
  Chloride   22.50   mg/l
  Conductivity   127.70   µs/cm
  Magnesium   5.18   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.002   mg/l
  Potassium   BDL   mg/l
  Sodium   2.70   mg/l
  Sulphate   3.15   mg/l
  Total Alkalinity   50.00   mg/l
  Total Dissolved Solids(TDS)   174.00   mg/l
  Total Fixed Solids(TFS)   136.00   mg/l
  Total Hardness as CaCo3   44.00   mg/l
  Total Suspended Solids(TSS)   62.00   mg/l
  Turbidity   39.10   NTU
  COD   34.00   mg/l
  Fluoride   BDL   mg/l