Water-Climate Challenge

Climate change is a global issue with local impacts. As accelerating greenhouse gas emissions raise the temperature of the Earth’s surface, the consequences include rising sea levels, shifting rainfall patterns, and more frequent and intense water scarcity, flooding and erosion. These impacts of Climate change are a threat to water supplies, human life, housing, harvests, production and ecosystems. In order to ensure adequate water in an uncertain future, the water sector has to find solutions to adapt to the unfolding risks brought on by climate change.

At the same time, the provision of potable water and the treatment of wastewater also contribute to greenhouse gas emissions. Water and wastewater systems are energy intensive – accounting for as much as 40% of municipal energy use – and this energy typically comes from burning fossil fuels. Water losses lead to even higher energy consumption, and untreated or poorly treated wastewater emits methane and nitrous oxide, gases with much higher global warming potential than carbon dioxide.

There are excellent opportunities for improving the Carbon balance of water and wastewater companies by updating their technologies and management processes into more energy-efficient systems, as well as recovering energy and nutrients from wastewater.

WaCCliM Project


A climate-smart and sustainable urban water sector on a local, national and global scale. 

We will reach our vision by…  

Providing user-focused technical support, approaches and tools that will enable committed water and wastewater utilities to assess, monitor and reduce their greenhouse gas emissions while enhancing their ability to adapt to climate change.

Constructing partnerships between the water and climate communities that position low-carbon and resilient water and wastewater management as key contributors to reaching climate policy objectives.

Scaling up and sharing our experiences, while building capacities and ownership among utilities, government agencies and international partners, to ensure the operational and financial sustainability of our activities.

The Water and Wastewater Companies for Climate Mitigation (WaCCliM) project is demonstrating that the water sector can reduce greenhouse gas emissions: in the short-term by improving operational efficiency and adopting energy efficiency measures; in the long-term by proactively upgrading and reforming their drinking water and wastewater systems. 

The WaCCliM project has developed the Energy Performance and Carbon Assessment and Monitoring Tool (ECAM) to drive GHG emission reduction in water utilities, while keeping a strong emphasis on energy savings to reduce costs. It is designed to assess the carbon emissions that utilities can control within the urban water cycle and prepares utilities for future reporting needs on climate mitigation.

WaCCliM Countries

WaCCliM is pioneering mitigation and adaptation solutions in the urban water sector in Jordan, Mexico and Peru.
A fourth cooperation in Thailand concluded successfully at the end of 2018. Water and wastewater utilities following the WaCCliM Roadmap are becoming sector leaders, and are seizing the opportunity to become more efficient and effective in an uncertain future.

Meet the Partners

WaCCliM works with multiple national and international partners to
address carbon and greenhouse gas emissions in water and wastewater utilities.

Donors and Implementing Partners

The Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) and the International Water Association (IWA) are working together with their partners from Jordan, Mexico, Peru and Thailand on the WaCCliM project. This project is part of the International Climate Initiative (IKI) . The German Federal Ministry for the Environment, Nature Conservation, Nuclear Safety and Consumer Protection (BMUV) supports this initiative on the basis of a decision adopted by the German Bundestag.