Lakes Department

Puttenahalli Lake

  • Location:Bangalore, Karnataka

Puttenahalli Lake is an iconic lake located in JP Nagar, Bengaluru and is one of the first few lakes revived through citizens action. Its rejuvenation inspired many citizens to form alliances and save more lakes in Bengaluru. It demonstrates that effective action by citizen groups can revitalise the civic culture, improve the nature of public discourse and generate the political will necessary to address pressing problems.

Puttenahalli Lake was filled with solid waste, wastewater and storm water runoff frog residential areas nearby in addition to construction debris. The lake's rebirth began in the year 2010, when a group of concerned citizens came together and formed the Puttenahalli Neighbourhood Lake Improvement Trust (PLOT). In collaboration with Bruhat Bengaluru Mahanagara Palike (BBMP), the trust helped bring the lake back to life through a series of interventions.

  • Total Area

    13.63 Acres (55,158.65sqm)
  • Total Water Spread Area

    10 Acres (40.468.6sqm)
  • Average Depth Of Lake

    16-18 feet (4.9-5.5m)

Key Interventions at Puttenahalli Lake


  • Boundary demarcation & fencing of lake boundary
  • Desilting of the Puttenahalli Lakes
  • Construction of bunds and revetment
  • Construction of sedimentation basin wetland
  • Installation of solid waste screens
Lakes recharge & wastewater treatment


  • Diversion tertiary treated wastewater from South city Sewage treatment plant
  • Installation of floating wetlands inside the sedimentation basin
Biodiversity Enhancement


  • Plantation of native plant species
  • Artificial bird perching islands


  • Deweeding Tree Tagging
  • Composting of organic waste
  • Volunteering by corporates and residents
Lakes Water Quality
Parameter P1
Inside Wetland
Outside Wetland
Waste Weir
Viewing Deck
PH 9.1 8.1 8.8 9.2 8.9
Temperature 27.0 27.5 26.7 26.9 26.8
Electrical Conductivity (us/cm) 628 825 617 615 611
Total Dissolved Solids (mg/L) 400 600 400 400 400
Suspended Soils(mg/L) 49 71 49 53 54
Turbidity (NTU) 55.2 60.9 59.9 63.3 65.6
Biochemical Oxygen Demand (mg/l) 20 22 22 26 22
Chemical Oxygen Demand (mg/l) 139 95 79 79 71
Phosphate as PO4 (mg/l) 0.6 3.1 0.4 BDL BDL
Ammonia as NH4-N (mg/l) 0.8 5.8 0.9 0.7 0.3
E.coli (MPN/100ml) 240 300 350 64 23
Wastewater Treatment Arrangement

South City Apartment Complex located adjacent to the Puttenahalli Lake currently releases tertiary treated wastewater into the lake.

  • Capacity of the STP - 11 MLD
  • Water distribution for flushing

Priority of water reuse

  • Water distribution for gardening and watering the premises
  • Water sent to the lake for recharge

There is an in-situ arrangement of floating wetlands for the treatment of wastewater.

  • No. of floating wetlands - 70 nos.
  • Total area occupied by wetlands - 1400 sq ft (130 sq m)
  • Plants used - Canna Indica, Papyrus, Duckweed, Colocasia, Elephant grass