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: 18/01/2022 Sample Time: 11:00  
Human Activities: None Weather: Cloudy. Water Body: Delo lake
Frequency Of Monitoring: Quarterly Use Based Class: C Approximate Depth(Bottom/Table): 1.00 m 
Color & Intensity: Light Green and clear Odour: Odour Free Visible effluent discharge: None


Water Quality
Parameter Test Result Unit
  Ammonia-N   0.18   mg/l
  BOD   0.80   mg/l
  Conductivity   19.03   µs/cm
  Dissolved O2(DO)   8.10   mg/l
  Fecal Coliform   80   MPN/100ml
  Nitrate-N   0.01   mg/l
  pH   7.58   Unit
  Temperature(Water)   8   ⁰C
  Total Coliform   140   MPN/100ml
  Boron   1.73   mg/l
  Calcium   8.82   mg/l
  Chloride   4.89   mg/l
  COD   11.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   2.88   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.011   mg/l
  Potassium   0.10   mg/l
  Sodium   0.60   mg/l
  Sulphate   2.07   mg/l
  Total Alkalinity   18.00   mg/l
  Total Dissolved Solids(TDS)   11.00   mg/l
  Total Fixed Solids(TFS)   26.00   mg/l
  Total Hardness as CaCo3   32.00   mg/l
  Total Suspended Solids(TSS)   7.00   mg/l
  Turbidity   0.68   NTU