City Grey Water Utilization
Turning wastewater into a circular resource
A multidisciplinary solutions framework to capture, treat, and redistribute 800 million litres of daily grey water, reducing freshwater dependency across Gujarat’s most water-stressed regions.
Gujarat has 6.39% of India’s land — but only 2.28% of its water
Geographic Imbalance
Of 185 rivers, only 8 are perennial — all in the south. 69% of surface water is concentrated in central and southern Gujarat, leaving the remaining three-quarters of the state severely under-resourced.
Water Stress
58.6% of Gujarat is water-stressed due to arid, semi-arid, and saline conditions — one of the highest proportions of any Indian state.
The Daily Drain
Every day, 700–800 million liters (MLD) of city grey water flows through Ahmedabad’s drainage system — largely untreated and untapped as a resource.
Treated wastewater can replace freshwater — at scale
The Government of Gujarat has introduced a forward-looking policy for treated wastewater (TWW) reuse: minimum 80% sewage coverage and collection across all municipal towns, 100% treatment of collected sewage, and treated wastewater replacing at least 25% of total freshwater consumption. This creates a direct opportunity to build a circular water economy where every litre treated becomes a usable resource.
A multidisciplinary Solutions Matrix
Reduce overall freshwater requirement and improve city-wide water security
Minimise river and sea pollution through efficient wastewater management
Enhance economic outcomes without compromising essential societal needs
Generate new water resources to support a sustainable and resilient India
Explore innovative and beneficial uses of afforestation, agriculture, urban greening
Create mass awareness and sensitivity among water users and communities
Direction of change
By developing knowledge-driven and research-driven solutions for sustainable TWW implementation, GSF aims to reduce freshwater dependency, protect natural water bodies from pollution and help create a water-secure Gujarat.
70%
TWW reuse target by
2025 (Gujarat policy)
100%
TWW reuse target by
2030 (Gujarat policy)
25%
Freshwater reduction
through substitution
800 MLD
Daily grey water
recoverable in Ahmedabad
