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: 23/07/2020 Sample Time: 12:50  
Human Activities: Washing and cattle wading Weather: Cloudy Water Body: Raidak
Frequency Of Monitoring: Monthly Use Based Class: B Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Clear and Green Odour: Fishy Visible effluent discharge: Moderate


Water Quality
Parameter Test Result Unit
  Potassium   0.80   mg/l
  Conductivity   141.54   µs/cm
  Dissolved O2(DO)   7.10   mg/l
  Fecal Coliform   1100   MPN/100ml
  Nitrate-N   0.50   mg/l
  Boron   2.76   mg/l
  Calcium   20.04   mg/l
  Chloride   13.69   mg/l
  COD   16.00   mg/l
  Fluoride   0.12   mg/l
  Magnesium   13.82   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Sodium   1.30   mg/l
  Sulphate   10.81   mg/l
  Total Alkalinity   36.00   mg/l
  Total Dissolved Solids(TDS)   42.00   mg/l
  Total Fixed Solids(TFS)   252.00   mg/l
  Total Hardness as CaCo3   98.00   mg/l
  Total Suspended Solids(TSS)   26.00   mg/l
  Turbidity   0.51   NTU
  Ammonia-N   0.11   mg/l
  BOD   1.40   mg/l
  pH   7.30   Unit
  Temperature(Water)   27   ⁰C
  Total Coliform   5000   MPN/100ml
  Phosphate-P   0.104   mg/l