West Bengal Pollution Control Board

Siliguri Laboratory

Paribesh Bhawan, Paribahan Nagar, P.O. Matigara, Siliguri,Darjeeling 734 428.



Station: KOCHBIHAR LAKE (SAGAR DIGHI) River Basin: Raidak_Torsa CPCB Station Code: 2519
Sample Date: 02/02/2022 Sample Time: 12:55  
Human Activities: None Weather: Sunny Water Body: Coochbihar lake
Frequency Of Monitoring: Quarterly Use Based Class: C Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Light green and moderately turbid Odour: Fishy Visible effluent discharge: None


Water Quality
Parameter Test Result Unit
  Ammonia-N   BDL   mg/l
  BOD   1.60   mg/l
  Conductivity   37.92   µs/cm
  Dissolved O2(DO)   8.80   mg/l
  Fecal Coliform   1400   MPN/100ml
  Nitrate-N   1.51   mg/l
  pH   8.10   Unit
  Temperature(Water)   16   ⁰C
  Total Coliform   30000   MPN/100ml
  Boron   0.71   mg/l
  Calcium   6.41   mg/l
  Chloride   7.83   mg/l
  COD   36.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   5.76   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.006   mg/l
  Potassium   0.40   mg/l
  Sodium   0.90   mg/l
  Sulphate   0.55   mg/l
  Total Alkalinity   36.00   mg/l
  Total Dissolved Solids(TDS)   22.00   mg/l
  Total Fixed Solids(TFS)   28.00   mg/l
  Total Hardness as CaCo3   36.00   mg/l
  Total Suspended Solids(TSS)   48.00   mg/l
  Turbidity   8.48   NTU