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With rapid economic growth and a growing population, decreasing per capita average annual water availability in India has become a cause for concern. Considering the present situation, water conservation has become necessity for every project. Buildings and built environment projects are responsible for more than 10% of total water consumption. In India, the raw water is primarily sourced from ground water and due to over-exploitation of ground water, several cities/municipal corporations are facing huge gap in water demand and supply.
Several buildings from different typologies adopted green building concepts to demonstrate 20-30% reduction in water consumption with respect to the national baselines. Green concepts primarily enabled projects to harvest rainwater, improved water efficiency, wastewater treatment and reuse of treated water in process and non-process applications.
To further improve the water performance in buildings and built environment projects, IGBC launched Net Zero Water Rating system in 2020. This rating is a tool which enables the designer to apply water efficiency concepts and adopt appropriate measures for harnessing alternate water to achieve Net Zero Water Status. In case of an existing building, the tool enables implementation of water efficient measures to reduce overall water consumption and encourages projects to meet rest of the water requirements through alternate water.
IGBC Net Zero Water rating system enables reduction in water consumption and use of alternate water to meet the water demand. The benefits of adopting Net Zero Water concepts in a building/ project are as below:
The intangible benefits of Net Zero Water include compliance to local regulation and promote water conservation. The rating system evaluates buildings on a performance-based approach. The rating system is evolved to be comprehensive and at the same time user-friendly.
The programme is fundamentally designed to reduce the water demand of a building and address national priorities such as:
IGBC Net Zero Water System addresses water efficiency and encourages for harnessing alternate water. The guidelines detailed mandatory requirement & credit enables the design and construction of buildings/projects of all sizes and types (as defined in the scope).
IGBC Net Zero Water Rating System is designed for both New and Existing building and built environment projects. The project team can evaluate all the possible points to apply under the rating system using a checklist. The project can apply for IGBC Net Zero Water Rating System certification if the project can meet all mandatory requirements and is able to demonstrate that the Water Performance Ratio is at least 0.75.
A building or built environment project to achieve Near Net Zero Water certification, Water Performance Ratio (% use of alternate water to total water consumption) shall be more than 0.75 (but less than 1); to obtain Net Zero Water certification, net raw water consumption shall be zero and further to achieve Net Water Positive (Platinum rating) Status, the water given back to source shall be more than 1.05.
IGBC Net Zero Water Rating is designed for both new and existing building and built environment projects. These buildings include (but are not limited to) Offices, IT parks, Banks, Shopping malls, Hotels, Hospitals, Transit facilities (Airports Metro and Railway Stations), Convention centres, Educational institutions (Schools, Colleges, University campuses etc.) and industrial buildings (factory buildings and Warehouses).
The threshold criteria for certification levels are as under :
| Certification Level | Recognition |
|---|---|
| Near Net Zero Water | Best Practices |
| Net Zero Water | National Excellence |
| Net Water Positive (Platinum) | Global Leadership |
IGBC will recognise Net Zero Water Buildings that achieve one of the rating levels with a formal letter of certification and a mountable plaque. Net Zero Water certification can be awarded either at Design Stage or during Operation. A building which achieves Net Zero Water Certification at Design State must showcase Net Zero Water Performance after one year of operation.
| Membership Category | Fee (INR) |
| IGBC Founding Member | 25,000 |
| IGBC Annual Member | 25,000 |
| Non Member | 30,000 |
| Membership Category | Base Fee | |||
| 5,000 sqm & below | 5,001 sq m to 75,000 sq m | 75,001 sq m & above | "For each additional building with built-up area 5,001 sqm and above (Additional fee is applicable for upto 4 buildings)" | |
| Flat Fee (₹) | Flat Fee (₹) | Flat Fee (₹) | Flat Fee (₹) | |
| IGBC Founding Member | ₹ 2,20,000 | Rs. 2,45,000 plus Rs. 5 per additional sq.m over & above 5,000 sq.m | ₹ 6,20,000 | ₹ 50,000 |
| IGBC Annual Member | ₹ 2,40,000 | Rs. 2,65,000 plus Rs. 5 per additional sq.m over & above 5,000 sq.m | ₹ 6,40,000 | ₹ 50,000 |
| Non-Member | ₹ 2,60,000 | Rs. 2,85,000 plus Rs. 5 per additional sq.m over & above 5,000 sq.m | ₹ 6,60,000 | ₹ 50,000 |
* Design certification fee is applicable for projects in design and construction phase.
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* Projects which have achieved/ applied for Precertification under other IGBC rating systems, a reduction in base fee by 10% shall be applicable
| Membership Category | Base Fee | |||
| 5,000 sq.m and below | 5,001 sq m to 75,000 sq m | 75,001 sq m & above | "For each additional building with built-up area 5,001 sqm and above (Additional fee is applicable for upto 4 buildings)" | |
| Flat Fee (₹) | Flat Fee (₹) | Flat Fee (₹) | Flat Fee (₹) | |
| IGBC Founding Member | ₹ 2,20,000 | Rs. 2,45,000 plus Rs. 7.5 per additional sq.m over & above 5,000 sq.m | ₹ 7,95,000 | ₹ 50,000 |
| IGBC Annual Member | ₹ 240,000 | Rs. 2,65,000 plus Rs. 7.5 per additional sq.m over & above 5,000 sq.m | ₹ 8,15,000 | ₹ 50,000 |
| Non-Member | ₹ 2,60,000 | Rs. 2,85,000 plus Rs. 7.5 per additional sq.m over & above 5,000 sq.m | ₹ 8,25,000 | ₹ 50,000 |
# *Additional building here refers to Projects with multiple buildings including common basements
# Projects which have achieved/ applied for Precertification under other IGBC rating systems, a reduction in base fee by 10% shall be applicable
# Projects which have achieved NZ Operations Certification and applying for Recertification
NZ – Energy, Water and NZ Waste to Landfill
NZ – Carbon
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