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: 10/06/2022 Sample Time: 12:40  
Human Activities: None Weather: Cloudy and Rainy. 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   1.90   mg/l
  Conductivity   47.03   µs/cm
  Dissolved O2(DO)   7.80   mg/l
  Fecal Coliform   3000   MPN/100ml
  Nitrate-N   0.53   mg/l
  pH   6.90   Unit
  Temperature(Water)   24   ⁰C
  Total Coliform   5000   MPN/100ml
  Boron   1.99   mg/l
  Calcium   6.40   mg/l
  Chloride   1.95   mg/l
  Fluoride   BDL   mg/l
  Magnesium   0.97   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.011   mg/l
  Potassium   0.90   mg/l
  Sodium   4.10   mg/l
  Sulphate   9.23   mg/l
  Total Alkalinity   28.00   mg/l
  Total Dissolved Solids(TDS)   26.00   mg/l
  Total Fixed Solids(TFS)   72.00   mg/l
  Total Hardness as CaCo3   20.0   mg/l
  Total Suspended Solids(TSS)   25.0   mg/l
  Turbidity   6.09   NTU
  COD   22.88   mg/l