West Bengal Pollution Control Board

Siliguri Laboratory

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



Station: MAHANANDA AT SILIGURI River Basin: Mahananda CPCB Station Code: 1946
Sample Date: 22/07/2021 Sample Time: 16:00  
Human Activities: Fishing Weather: Sunny and humid Water Body: Mahananda at Siliguri
Frequency Of Monitoring: Quarterly Use Based Class: C Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Moderately Brown and turbid Odour: Fishy Visible effluent discharge: Moderate


Water Quality
Parameter Test Result Unit
  BOD   1.80   mg/l
  Conductivity   70.55   µs/cm
  Dissolved O2(DO)   6.90   mg/l
  Fecal Coliform   3400   MPN/100ml
  Fecal Streptococci   48   MPN/100ml
  Nitrate-N   0.28   mg/l
  pH   6.92   Unit
  Temperature(Water)   27   ⁰C
  Total Coliform   13000   MPN/100ml
  Boron   0.69   mg/l
  Calcium   17.64   mg/l
  Chloride   12.72   mg/l
  COD   16.56   mg/l
  Fluoride   0.12   mg/l
  Magnesium   10.94   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.005   mg/l
  Potassium   2.20   mg/l
  Sodium   7.60   mg/l
  Sulphate   3.48   mg/l
  Total Alkalinity   74.00   mg/l
  Total Dissolved Solids(TDS)   58.00   mg/l
  Total Fixed Solids(TFS)   130.00   mg/l
  Total Hardness as CaCo3   82.00   mg/l
  Total Suspended Solids(TSS)   24.00   mg/l
  Turbidity   4.58   NTU
  Ammonia-N   0.12   mg/l