| The Impact of Deer Overabundance on Forest Regeneration | Participant | 2013-01-01 | Ongoing |
| Soil mass and chemistry in 25 Catskill headwater catchments | Site Operator | 2010-06-01 | 2014-05-31 |
| New York City Watershed Lands Forest Inventory | Site Operator | 2002-01-02 | Ongoing |
| New York City Watershed Lands Forest Stand Delination | Site Operator | 2003-01-01 | Ongoing |
| New York City Water Supply Stream Sampling | Site Operator | 1987-01-01 | Ongoing |
| New York City Water Supply Reservoir Monitoring | Site Operator | 1987-01-01 | Ongoing |
| New York City DEP Wastewater Treatment Plants Monitoring | Site Operator | 1987-01-01 | Ongoing |
| Catskill Mountains Vegetation Sampling | Site Operator | 1997-01-01 | 2000-12-31 |
| Catskill Mountains Vegetation Cover Maps | Site Operator | 1997-01-01 | 2001-08-01 |
| New York City DEP Reference Wetlands Monitoring | Site Operator | 2004-06-01 | Ongoing |
| New York City DEP Catskills Meteorological Data | Site Operator | 1996-01-01 | Ongoing |
| New York City DEP Snow Surveys | Site Operator | 1963-01-01 | Ongoing |
| Surveillance Monitoring for Invasive Species in New York City DEP Reservoirs | Site Operator | 1992-01-01 | Ongoing |
| Catskill Mountains Nitrogen Fertilization Study | Site Operator | 1997-07-01 | 2010-09-30 |
| New York City DEP Season Vernal Pool Monitoring | Site Operator | 2010-04-01 | Ongoing |
| Adirondack and Catskill Stream Fish Survey | Participant | 2012-01-01 | 2017-12-31 |
| USGS Stream Gages | Participant | 1931-10-01 | Ongoing |
| National Atmospheric Deposition Program (NADP) - Mercury Deposition Network (MDN) | Participant | 2004-03-09 | Ongoing |
| Clean Air Status and Trends Network (CASTNET) | Participant | 1994-05-01 | Ongoing |
| National Oceanic and Atmospheric Administration (NOAA) Weather Stations | Participant | 1924-06-01 | Ongoing |
