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: 15/07/2022 Sample Time: 15:00  
Human Activities: None Weather: Sunny and Clear. Water Body: Raidak
Frequency Of Monitoring: Monthly Use Based Class: B Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Light Green and turbid Odour: Fishy Visible effluent discharge: None


Water Quality
Parameter Test Result Unit
  BOD   2.10   mg/l
  Total Coliform   14000   MPN/100ml
  Boron   1.39   mg/l
  Calcium   27.20   mg/l
  Chloride   3.91   mg/l
  COD   7.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   10.69   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.06   mg/l
  Potassium   2.50   mg/l
  Sodium   4.70   mg/l
  Sulphate   10.25   mg/l
  Total Alkalinity   114.00   mg/l
  Total Dissolved Solids(TDS)   156.00   mg/l
  Total Fixed Solids(TFS)   176.00   mg/l
  Total Hardness as CaCo3   112.00   mg/l
  Total Suspended Solids(TSS)   30.00   mg/l
  Turbidity   6.60   NTU
  Ammonia-N   BDL   mg/l
  Conductivity   230.30   µs/cm
  Dissolved O2(DO)   7.20   mg/l
  Fecal Coliform   7000   MPN/100ml
  Fecal Streptococci   22   MPN/100ml
  Nitrate-N   0.11   mg/l
  pH   7.49   Unit
  Temperature(Water)   32   ⁰C