Water Day 2020 was a day of recreation worldwide as billions gathered at rivers, lakes, beaches, and oases. Public celebrations of all sorts, with speeches and ceremony honoring the efforts of local water stewards and scientists. It's amazing to see people swimming in bodies of water expected to dry up years ago, or those considered unfit for humans last decade. Some are taking swimming lessons for the first time due to the occasion, those more experienced are lining up for races or other competitions, still others are coordinating the volunteer efforts that will keep the water-systems in good shape for another decade.
Of course, recreation is not the most important use of water, but it's a good metric: If your water is safe enough to play in, it's probably (saltwater excepted) easy enough to make it safe to drink, clean enough to sustain a healthy ecosystem of fish and plants, and reliable enough for a lot of other uses. Just make sure to know (and steer clear of) the less-friendly varieties of local wildlife.