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: 22/09/2021 Sample Time: 16:45  
Human Activities:  Fishing,washing and bathing Weather: Sunny and Clear. Water Body: Mahananda at Siliguri
Frequency Of Monitoring: Quarterly Use Based Class: C Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Light Brown and turbid Odour: Fishy Visible effluent discharge: Moderate


Water Quality
Parameter Test Result Unit
  Ammonia-N   BDL   mg/l
  BOD   1.60   mg/l
  Conductivity   85.74   µs/cm
  Dissolved O2(DO)   7.0   mg/l
  Fecal Coliform   1400   MPN/100ml
  Fecal Streptococci   14   MPN/100ml
  Nitrate-N   0.18   mg/l
  pH   6.75   Unit
  Temperature(Water)   29   ⁰C
  Total Coliform   3400   MPN/100ml
  Boron   1.13   mg/l
  Calcium   11.22   mg/l
  Chloride   8.80   mg/l
  COD   28.00   mg/l
  Fluoride   0.14   mg/l
  Magnesium   9.22   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.005   mg/l
  Potassium   1.5   mg/l
  Sodium   3.1   mg/l
  Sulphate   6.85   mg/l
  Total Alkalinity   50.0   mg/l
  Total Dissolved Solids(TDS)   24.00   mg/l
  Total Fixed Solids(TFS)   64.00   mg/l
  Total Hardness as CaCo3   60.00   mg/l
  Total Suspended Solids(TSS)   38.00   mg/l
  Turbidity   4.39   NTU