As cities in emerging economies continue to grow, access to safe water, sustainable waste management and other municipal infrastructure must expand to meet demand. More than 150 million city dwellers lack efficient, affordable connections to water services and 700 million live without adequate sanitation, according to the United Nations. Lack of clean water is a serious public health concern, especially in the wake of the COVD-19 pandemic. Poor sanitation also poses significant environmental challenges. The cost and complexity of addressing these problems is very high. As a result, innovative market-oriented long-term solutions are needed.