New York Water Science Center

Groundwater and Streamflow Information

Groundwater and surface water are among the Nation’s most important natural resources. The USGS provides unbiased, timely, and relevant information, studies, and data about water resources of the Nation. The NYWSC maintains a network of more than 300 surface water and 650 groundwater monitoring stations across New York State; over the years, the USGS has collected water-resources data at approximately 1.5 million sites in all 50 States, the District of Columbia, Puerto Rico, the Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands. The data collected at the various sites are synthesized in State-level, interstate, and international studies to evaluate resources not only in one State but also other States and countries that might be affected or may influence the condition of surface water and groundwater. The data collected are used in studies of water supplies, groundwater contamination, flooding, water stored in ice and the oceans, and the effects of climate and land use change and manmade influences.

Filter Total Items: 89
Date published: February 21, 2019
Status: Active

Surface-water quality in the Lake Erie/Niagara River Basin of New York State

Problem The New York State Department of Environmental Conservation (NYSDEC) intends to develop a Nine-Element Watershed Plan ( for the Lake Erie/Niagara Basin. To develop the Nine-Element Plan, NYSDEC needs a high quality, quality assured, nutrient-loading dataset to serve as a baseline...

Date published: October 10, 2018
Status: Active

Hydrogeologic and Geochemical Assessment of the Effects of Leakage from the Catskill and Delaware Aqueducts on the Local Bedrock and Overburden Aquifers in Southeastern New York

PROBLEM As part of an effort to sustain a viable water-supply system for 8 million residents in New York City, and 1 million other residents in upstate New York that rely on City water, the New York City Department of Environmental Protection (NYCDEP) has requested a multi-disciplinary study by the U.S. Geological Survey (USGS) to determine the source(s) of water to surface-water sites (...

Date published: May 14, 2018
Status: Active

Hydrologic Monitoring in the Central Pine Barrens

The Long Island Central Pine Barrens (CPB) is a large, preserved region of pristine ecological habitat located in eastern parts of Suffolk County, Long Island, NY. The 105,000-acre CPB encompasses portions of the Towns of Brookhaven, Riverhead, and Southampton, and is a core part of the larger Long Island Pine Barrens Maritime Reserve (fig. 1). The CPB overlies portions of Long Island’s...

Contacts: Irene J Fisher
Date published: April 19, 2018
Status: Active

Current Water Conditions in New York

• National Water Information System (NWIS):   Find water-resources data collected at approximately 1.5 million sites, using menu-based and map-based front ends.
• WaterWatch:  View maps, graphs, and tables describing real-time, recent, and past streamflow conditions for the United States. 

Date published: March 1, 2018
Status: Active

Groundwater Sustainability of the Long Island Aquifer System

Groundwater sustainability can be best defined as the development and use of groundwater in a manner that can be maintained for an indefinite time without causing unacceptable environmental or socioeconomic consequences. Informed management of the Long Island aquifer system can help ensure a regionally sustainable groundwater resource. This study will evaluate the sustainability of Long Island...

Date published: February 28, 2018
Status: Active

Hydrogeologic-Framework Mapping - Long Island, New York


Long Island is underlain by unconsolidated Holocene deposits, glacial deposits of Pleistocene age, and coastal-plain deposits  of Late Cretaceous age. These sediments...

Date published: February 28, 2018
Status: Active

Saltwater-Interface Mapping - Long Island, New York


Saltwater intrusion is the most common type of water-quality degradation in coastal-plain aquifers. In coastal areas, the hydraulic head under predevelopment (nonpumping) conditions is higher on land than in the surrounding...

Date published: February 26, 2018
Status: Active

Groundwater-Flow Modeling - Long Island, New York


Numerical models provide a means to synthesize existing hydrogeologic information into an internally consistent mathematical representation of a real system or process, and thus are useful tools for testing and improving...

Date published: February 25, 2018
Status: Active

Groundwater Sustainability - Long Island, New York


Groundwater sustainability can best be defined as the development and use of groundwater in a manner that can be maintained for an indefinite time without causing unacceptable environmental or socioeconomic consequences. Informed...

Date published: January 26, 2018
Status: Active

305b Groundwater Quality Monitoring in New York

Relatively little data describing the quality of groundwater in New York State exist, yet groundwater is used as a source of drinking water by approximately one quarter of the population of the state. The objective of the 305(b) groundwater quality monitoring project is to quantify and report on ambient groundwater quality from bedrock and glacial-drift aquifers in upstate New York.


Date published: January 5, 2018
Status: Completed

Hudson River Salt Front Data

Tide stage, specific conductance, water temperature, and freshwater inflow at selected Hudson River (New York) gages updated every hour. Water temperature and specific conductance are measured at a depth of 10 feet below NGVD 1929 (mean sea level). These data include PROVISIONAL DATA subject to revision.


Contacts: Tim Hoffman
Date published: December 11, 2017
Status: Active

Monthly Hydrologic Conditions for New York

The U.S. Geological Survey New York Water Science Center’s monthly summary reports and tables of hydrologic conditions for surface and ground water list the station, county, period of record, and several statistics, including color-coded percent exceedance* categories based on average monthly conditions for the period of record at each station.