Chennai - TN

Days of Water Left

Updated 19 Jun 2026
288 days+
days remaining
Worst case (no rain):288 days
Current trend:Won’t run out(inflow 3.0x of demand)
If seasonal rains:Won’t run out(inflow 3.3x of demand)
Reservoir storage: 6,530 / 13,222 mcft49.4%

Chennai's water at a glance

Reservoir storage is under half capacity. Reservoirs hold 49% of capacity. 14 of 194 groundwater wards show stressed or critical levels. 65 wards are declining year-over-year. 246 water bodies near degraded rivers are flagged for priority restoration.

Explore groundwaterSee restoration prioritiesFlood risk and drainage

Reservoirs: 2026-06-19 | Groundwater: Mar 2024

Catchment Rainfall Context

3 of 4 supply reservoir catchments are above normal over 30 days. Cholavaram catchment is 26% above its 30-day norm.

Chembarambakkam
Above+24%
Red Hills (Puzhal)
Above+26%
Poondi
Near normal+1%
Cholavaram
Above+26%

Catchment rainfall through 31 May 2026 (30-day window).

Reservoir Status

Chembarambakkam

80.9%
2,950mcft
of 3,645 mcft capacity
In: 280Out: 213

Red Hills (Puzhal)

49.9%
1,647mcft
of 3,300 mcft capacity
In: 210Out: 208

Poondi

33.6%
1,087mcft
of 3,231 mcft capacity
In: 285Out: 305

Veeranam

30.8%
451mcft
of 1,465 mcft capacity
In: 0Out: 73

Kannankottai

62.2%
311mcft
of 500 mcft capacity
In: 0Out: 17

Cholavaram

7.8%
84mcft
of 1,081 mcft capacity
In: 0Out: 8

Groundwater Health

Explore map
Data may be outdated. Latest available from OpenCity / CMWSSB is Mar 2024. We're actively looking for newer sources.
5.0m
city average depth to water table
Healthiest: Ward 6 (0.5m)
Most stressed: Ward 32 (16.0m)
Ward distribution (194 wards)
52 healthy88 moderate12 stressed2 critical
Search latest Chennai water news→|Via Google News

Groundwater

CGWB block exploitation, ward depth (interpolated), live WRIS station overlay.

Water bodies

OSM polygons, flagship tanks, restoration priority badges, lost-tank inventory.

About this dashboard

Methodology, data sources, water sources tracked, and the data gaps we're honest about.

Methodology: Reservoir levels for Chennai from CMWSSB. Daily consumption assumptions (~830 MLD demand) are starting points; the sliders above let you substitute your own. See theAbout pagefor the full data-source index and methodology.