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Rising Salinity Threatens NYC's Croton Water System by 2100

A new report warns that increasing salt levels, driven by road salt and urban development, could render the Croton Water System unusable as a drinking water source within decades.

The New Croton Dam and the New Croton Reservoir that supplies part of New York City's drinking water is seen in Cortlandt, N.Y., on Thursday, March 20, 2025. (AP Photo/Ted Shaffrey)
The New Croton Dam and the New Croton Reservoir that supplies part of New York City's drinking water is seen in Cortlandt, N.Y., on Thursday, March 20, 2025. (AP Photo/Ted Shaffrey)
The New Croton Dam and the New Croton Reservoir that supplies part of New York City's drinking water is seen in Cortlandt, N.Y., on Thursday, March 20, 2025. (AP Photo/Ted Shaffrey)
The New Croton Reservoir that supplies part of New York City's drinking water is seen in Cortlandt, N.Y., on Thursday, March 20, 2025. (AP Photo/Ted Shaffrey)

Overview

  • The Croton Water System, which supplies 10% of New York City's drinking water, faces rising salinity levels primarily due to road salt, wastewater discharges, and water softeners.
  • Chloride concentrations in the Croton system's main reservoir have tripled since 1987 and are projected to exceed state limits by 2108 if no action is taken.
  • City officials warn that the system may need to be abandoned by 2100, impacting millions of residents and municipalities reliant on its water.
  • Proposed mitigation strategies include reducing road salt use, implementing reverse osmosis systems, and blending Croton water with less salty sources, though challenges remain.
  • Legislative efforts, led by State Senator Pete Harckham, aim to address road salt use and study its environmental impact within the watershed.