West Bengal Pollution Control Board

Siliguri Laboratory

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



Station: River Raidak at Alipurduar River Basin: Tista CPCB Station Code: 4728
Sample Date: 18/12/2019 Sample Time: 13:20 Hrs  
Human Activities: Fishing. Weather: Sunny and Clear. Water Body: Raidak
Frequency Of Monitoring: Monthly Use Based Class: B Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Moderately Brown and Muddy Odour: Fishy. Visible effluent discharge: None.


Water Quality
Parameter Test Result Unit
  Ammonia-N   BDL   mg/l
  Calcium   20.04   mg/l
  Chloride   5.87   mg/l
  COD   33.00   mg/l
  Nitrate-N   3.17   mg/l
  pH   7.89   Unit
  Temperature   19   ⁰C
  Total Coliform   7000   MPN/100ml
  Boron   0.023   mg/l
  BOD   1.20   mg/l
  Turbidity   5.67   NTU
  Total Suspended Solids(TSS)   20.00   mg/l
  Potassium   1.80   mg/l
  Sodium   0.50   mg/l
  Sulphate   15.06   mg/l
  Total Dissolved Solids(TDS)   46.00   mg/l
  Total Fixed Solids(TFS)   42.00   mg/l
  Total Hardness as CaCo3   98.0   mg/l
  Conductivity   134.70   µs/cm
  Dissolved O2(DO)   7.40   mg/l
  Fecal Coliform   2100   MPN/100ml
  Fluoride   BDL   mg/l
  Magnesium   13.82   mg/l
  Phosphate-P   0.034   mg/l
  Total Alkalinity   70.00   mg/l
  Phenolpthalein Alkanity   NIL   mg/l