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: 21/01/2020 Sample Time: 13:10 Hrs  
Human Activities: None Weather: Clear and Sunny 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
  Fecal Coliform   2100   MPN/100ml
  Ammonia-N   0.14   mg/l
  Conductivity   124.13   µs/cm
  BOD   0.80   mg/l
  Dissolved O2(DO)   7.40   mg/l
  Fluoride   BDL   mg/l
  Turbidity   3.54   NTU
  Nitrate-N   0.53   mg/l
  pH   7.40   Unit
  Calcium   22.44   mg/l
  Temperature   18   ⁰C
  Total Coliform   5000   MPN/100ml
  Magnesium   8.06   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Chloride   7.83   mg/l
  COD   27.00   mg/l
  Phosphate-P   0.018   mg/l
  Potassium   2.0   mg/l
  Sodium   0.40   mg/l
  Total Alkalinity   84.00   mg/l
  Total Dissolved Solids(TDS)   48.00   mg/l
  Total Fixed Solids(TFS)   52.00   mg/l
  Sulphate   20.83   mg/l
  Total Hardness as CaCo3   110.00   mg/l
  Total Suspended Solids(TSS)   20.00   mg/l
  Boron   5.10   mg/l