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: 28/06/2021 Sample Time: 12:30  
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 moderately turbid Odour: Fishy Visible effluent discharge: None


Water Quality
Parameter Test Result Unit
  Ammonia-N   BDL   mg/l
  BOD   2.00   mg/l
  Conductivity   46.08   µs/cm
  Dissolved O2(DO)   7.60   mg/l
  Fecal Coliform   2300   MPN/100ml
  Fecal Streptococci   13   MPN/100ml
  Calcium   14.43   mg/l
  Chloride   11.74   mg/l
  COD   26.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   4.60   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.003   mg/l
  Potassium   1.1   mg/l
  Sodium   3.0   mg/l
  Sulphate   13.47   mg/l
  Total Alkalinity   72.0   mg/l
  Total Dissolved Solids(TDS)   28.0   mg/l
  Total Fixed Solids(TFS)   64.00   mg/l
  Total Hardness as CaCo3   52.0   mg/l
  Nitrate-N   0.09   mg/l
  pH   7.28   Unit
  Temperature(Water)   22   ⁰C
  Total Coliform   7000   MPN/100ml
  Boron   1.26   mg/l
  Total Suspended Solids(TSS)   14.0   mg/l
  Turbidity   8.12   NTU