Water is essential to life, and while we usually take it for granted, it is a precious commodity with a limited supply. Population growth, pollution, and climate change are leading to shortages of clean and accessible freshwater.Water shortages have caused drought in California, rationing in South Africa, deadly protests in Iran and clashes among African countries. Water scarcity is already a big problem in countries with high population density. Per United Nations Environment Program, almost half the global population will be living in areas of high water stress by 2030.President Biden’s infrastructure bill includes $55 billion for water infrastructure and other water system related investments. Investing in water could be a good long-term bet for those concerned about its sustainability. It is also a good option for environmentally focused investors.The Invesco Water Resources ETF (PHO) holds companies that create products designed to conserve and purify water. The First Trust Water ETF (FIW) invests in companies that derive a large portion of their revenues from the potable and wastewater industry. The Invesco S&P Global Water Index ETF (CGW) holds water utilities, infrastructure, equipment, instruments and materials companies.Waters Corporation (WAT), Danaher Corporation (DHR) and Roper Technologies (ROP) are among the top holdings in these ETFs. To learn more, please watch the short video above. Zacks' Top Picks to Cash in on Artificial Intelligence In 2021, this world-changing technology is projected to generate $327.5 billion in revenue. Now Shark Tank star and billionaire investor Mark Cuban says AI will create "the world's first trillionaires." Zacks' urgent special report reveals 3 AI picks investors need to know about today.See 3 Artificial Intelligence Stocks With Extreme Upside Potential>>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Waters Corporation (WAT): Free Stock Analysis Report Roper Technologies, Inc. (ROP): Free Stock Analysis Report Invesco S&P Global Water Index ETF (CGW): ETF Research Reports First Trust Water ETF (FIW): ETF Research Reports Invesco Water Resources ETF (PHO): ETF Research Reports Danaher Corporation (DHR): Free Stock Analysis Report To read this article on Zacks.com click here.