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: 13/06/2022 Sample Time: 12:20  
Human Activities: None Weather: Sunny and Clear. 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   BDL   mg/l
  BOD   0.80   mg/l
  Conductivity   26.85   µs/cm
  Dissolved O2(DO)   7.40   mg/l
  Fecal Coliform   70   MPN/100ml
  Nitrate-N   0.68   mg/l
  pH   7.02   Unit
  Temperature(Water)   19   ⁰C
  Total Coliform   140   MPN/100ml
  Boron   2.93   mg/l
  Calcium   1.60   mg/l
  Chloride   0.97   mg/l
  COD   9.00   mg/l
  Fluoride   BDL   mg/l
  Magnesium   0.48   mg/l
  Phenolpthalein Alkanity   NIL   mg/l
  Phosphate-P   0.014   mg/l
  Potassium   0.80   mg/l
  Sodium   4.10   mg/l
  Sulphate   5.99   mg/l
  Total Alkalinity   18.00   mg/l
  Total Dissolved Solids(TDS)   10.00   mg/l
  Total Fixed Solids(TFS)   166.00   mg/l
  Total Hardness as CaCo3   6.00   mg/l
  Total Suspended Solids(TSS)   4.00   mg/l
  Turbidity   1.53   NTU