West Bengal Pollution Control Board

Siliguri Laboratory

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



Station: River Siltorsa at Hasimara River Basin: Tista CPCB Station Code: 4718
Sample Date: 23/07/2021 Sample Time: 11:40  
Human Activities: None Weather: Sunny and humid Water Body: Siltorsa
Frequency Of Monitoring: Monthly Use Based Class: B Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Moderately green and clear Odour: Fishy Visible effluent discharge: None


Water Quality
Parameter Test Result Unit
  BOD   1.40   mg/l
  Conductivity   96.24   µs/cm
  Dissolved O2(DO)   6.80   mg/l
  Fecal Coliform   2100   MPN/100ml
  Fecal Streptococci   17   MPN/100ml
  Nitrate-N   0.27   mg/l
  pH   7.21   Unit
  Temperature(Water)   29   ⁰C
  Total Coliform   7000   MPN/100ml
  Boron   0.79   mg/l
  Calcium   16.84   mg/l
  Chloride   11.74   mg/l
  COD   13.00   mg/l
  Fluoride   0.16   mg/l
  Magnesium   6.91   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.004   mg/l
  Potassium   0.60   mg/l
  Sodium   1.80   mg/l
  Sulphate   10.45   mg/l
  Total Alkalinity   64.00   mg/l
  Total Dissolved Solids(TDS)   60.00   mg/l
  Total Fixed Solids(TFS)   38.00   mg/l
  Total Hardness as CaCo3   66.00   mg/l
  Total Suspended Solids(TSS)   14.00   mg/l
  Turbidity   3.35   NTU
  Ammonia-N   0.15   mg/l