Putnam County, New York: drinking water report. Putnam County sits between the Hudson Valley and the New York City watershed, with a population of about…
Putnam County sits between the Hudson Valley and the New York City watershed, with a population of about 97,000. Some of the county's eastern reservoirs are part of the New York City water supply system – the Croton system – while local communities draw from their own wells and small surface water sources. The county's proximity to both rural and suburban land uses creates a mixed contamination profile, with septic systems, road salt, and agricultural runoff all contributing.
New York's strict PFAS MCLs of 10 ppt for individual compounds have flagged contamination in small systems across the Hudson Valley. According to the NYSDOH's 2024 PFAS monitoring report, three community water systems in Putnam County detected PFAS above the state MCL. The sources are not military – they appear linked to consumer product residues in septic effluent and biosolids applied to agricultural land.
Winter road salt application is a less-discussed but persistent concern. The USGS has documented rising chloride levels in groundwater across the lower Hudson Valley, and Putnam County's well-dependent communities are seeing the effects. A 2023 USGS study found that chloride concentrations in 15% of tested wells in the region exceeded the secondary standard of 250 mg/L.
Putnam County's reliance on small water systems and private wells means water quality is highly localized. Your neighbor's well may produce water with completely different chemistry than yours.
Check your water for any available data on your system. For PFAS, reverse osmosis is the strongest option. For elevated chloride from road salt, reverse osmosis also helps. Our water filter guide covers options for small-system and well-water situations. Pull your detailed report for trends, and visit our New York page for statewide context.