West Bengal Pollution Control Board

Siliguri Laboratory

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



Station: WATER RESERVIOR AT DELO River Basin: Tista CPCB Station Code: 2521
Sample Date: 14/05/2019 Sample Time: 14:00 Hrs  
Human Activities: None Weather: Calm and sunny Water Body: Delo lake
Frequency Of Monitoring: Quarterly Use Based Class: C Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Light Green & Clear Odour: Odour free Visible effluent discharge: none


Water Quality
Parameter Test Result Unit
  Sodium   0.70   mg/l
  Sulphate   1.26   mg/l
  Total Alkalinity   20.00   mg/l
  Total Dissolved Solids(TDS)   22.00   mg/l
  Total Fixed Solids(TFS)   <4.0   mg/l
  Total Hardness as CaCo3   24.0   mg/l
  Total Suspended Solids(TSS)   12.00   mg/l
  Turbidity   1.36   NTU
  Ammonia-N   BDL   mg/l
  BOD   1.80   mg/l
  Conductivity   15.49   µs/cm
  Dissolved O2(DO)   6.50   mg/l
  Fecal Coliform   80   MPN/100ml
  Nitrate-N   0.19   mg/l
  pH   7.84   Unit
  Temperature   14   ⁰C
  Total Coliform   170   MPN/100ml
  Boron   0.003   mg/l
  Calcium   4.81   mg/l
  Chloride   5.87   mg/l
  COD   15.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   3.46   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.006   mg/l
  Potassium   BDL   mg/l