Our friend Charles Sturcken of the DEP recently explained why water tastes different in different parts of New York City, and why the taste may change in 2022.
Neighborhoods in New York City receive their drinking water from reservoirs of the Catskill System, Croton System, Delaware System, or a combination of the three systems. The chemistry of each water source is different because of the underlying geology that surrounds our reservoirs in the Catskills and the Hudson Valley. Differences in bedrock and soil affect pH, alkalinity, calcium content and other chemical characteristics of our drinking water. Water consumers will generally not notice these small differences. However, those who use New York City water to operate industrial equipment and mechanical systems might notice that changes in water chemistry require adjustments to their treatment systems, maintenance regiments and other upkeep routines.
From the end of May until October, the DEP expects the reservoir and distribution systems to be in their normal operating condition. That configuration will likely change in October when the DEP shuts the Catskill Aqueduct for the final year of a rehabilitation project that will keep the century-old aqueduct in good working order for the next 100 years. Continued updates of the water distribution maps and other information can be found at https://www1.nyc.gov/site/dep/water/current-water-distribution.page .