Skip Links

USGS - science for a changing world

New York Water Science Center 

Prepared in cooperation with

305(b) Ambient Groundwater Quality Monitoring

Map of study areas (major hydrologic basins) in New York

INTRODUCTION

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. An ongoing cooperative project between the U.S. Geological Survey (USGS) and New York State Department of Environmental Conservation (NYSDEC) Division of Water, this study supports NYSDEC’s responsibilities under Section 305(b) of the Clean Water Act Amendments of 1977. The resulting data set will be used to establish a groundwater quality baseline for New York State, characterizing naturally occurring, or background, conditions, and to identify long-term trends.

APPROACH

Two to three of the 14 major hydrologic basins around the state are evaluated each year; in 2011 samples will be collected in the Mohawk River Basin and Western New York (Niagara and Allegheny River Basins, Lake Erie, and Western Lake Ontario Basins). Water samples are collected from domestic wells and public supply wells using standard USGS protocols (click here for an overview of how samples are collected). Samples are analyzed for a wide range of constituents, including physical parameters (such as pH and temperature), nutrients, major ions, trace elements including mercury and arsenic, Coliform bacteria, radon, total organic carbon, volatile organic compounds, and pesticides.

Groundwater quality samples are collected and analyzed using consistent, standardized methods. Fifty to sixty groundwater samples are collected each year from existing domestic and public supply wells using standard USGS protocols. Wells are selected to represent an approximately equal number of public and private wells, an approximately equal number of bedrock and glacial-drift wells, and to provide a representative geographic distribution of samples. Most private wells selected for sampling are identified through NYSDEC’s Water Well Program. The groundwater sampling parallels surface-water sampling done as part of the NYSDEC Rotating Integrated Basin Studies program (RIBS) program, and areas of the State (excluding Long Island, which is monitored through local County programs) are sampled once every five years.

The data are made available through the USGS National Water Information System and project reports. The project began in 2002 with a pilot study in the Mohawk River Basin, and sampling completed in 2008 represented the conclusion of a first round of groundwater-quality sampling throughout upstate New York State. As basins are sampled for the second and third time, approximately 20 percent of samples are collected from wells that previously have been sampled as part of this study. At the completion of the 2011 sampling season, more than 450 unique wells have been sampled as part of this project. Additional shale-gas-formation-relevant analyses, including dissolved-methane-gas concentration, were added in 2009.

RESULTS

Results of the groundwater quality sampling have shown that groundwater quality in New York State is generally good, but can vary greatly depending on local hydrogeology and land use. The most common constituents to exceed existing or proposed drinking water standards include radon-222, iron, manganese, and coliform bacteria.

Examples of study-wide results are shown below for radon-222 and dissolved methane gas. The highest radon-222 activities detected, as much as 18,800 picocuries per liter, were found in samples collected from wells finished in crystalline bedrock. Radon-222 activities in many samples exceeded 300 picocuries per liter, part of a proposed drinking water standard, but few exceeded 4,000 picocuries per liter. Most samples had less than one milligram per liter of dissolved methane, but some samples had more than 20 milligrams per liter of dissolved methane. The maximum concentration of dissolved methane detected was more than 45 milligrams per liter in a sample from the Mohawk River Basin.

Map Map

BASIN STUDY REPORTS by YEAR

Basin Year Report
Lower Hudson River Basin 2013 In draft
Eastern Lake Ontario River Basin 2013 In draft
Upper Hudson River Basin 2012 Open-File Report 2014-1084
Oswego, Seneca, Oneida, and Central Lake Ontario Basins 2012 Open-File Report 2014-1226
Mohawk River Basin 2011 Open-File Report 2013-1021
Allegheny, Niagara, Lake Erie, and Western Lake Ontario Basins 2011 Open-File Report 2013-1095
Delaware River Basin 2010 Open-File Report 2011-1320
Genesee River Basin 2010 Open-File Report 2012-1135
St Lawrence River Basin 2010 Open-File Report 2011-1320
Lake Champlain Basin 2009 Open-File Report 2011-1180
Susquehanna River Basin 2009 Open-File Report 2012-1045
Chemung River Basin 2008 Open-File Report 2011-1112
Eastern Lake Ontario River Basin 2008 Open-File Report 2011-1074
Lower Hudson River Basin 2008 Open-File Report 2010-1197
Oswego, Seneca, Oneida, and Central Lake Ontario Basins 2007 Open-File Report 2009-1257
Upper Hudson River Basin 2007 Open-File Report 2009-1240
Mohawk River Basin 2006 Open-File Report 2008-1086
Allegheny, Niagara, Lake Erie, and Western Lake Ontario Basins 2006 Open-File Report 2008-1140
Delaware River Basin 2005-06 Open-File Report 2007-1098
Genesee River Basin 2005-06 Open-File Report 2007-1093
St Lawrence River Basin 2005-06 Open-File Report 2007-1066
Lake Champlain Basin 2004 Open-File Report 2006-1088
Susquehanna River Basin 2004-05 Open-File Report 2006-1161
Chemung River Basin 2003 Open-File Report 2004-1329
Mohawk River Basin 2002 Water-Data Report NY-02-1, pages 502-520

SITES and DATA by BASIN, ALL SAMPLES

Basin Table of Sites Map of Sites Tab-delimited Data Table
Lower Hudson River Basin Sites Map Data
Eastern Lake Ontario River Basin Sites Map Data
Upper Hudson River Basin Sites Map Data
Oswego, Seneca, Oneida, and Central Lake Ontario Basins (Finger Lakes) Sites Map Data
Mohawk River Basin Sites Map Data
Allegheny, Niagara, Lake Erie, and Western Lake Ontario Basins Sites Map Data
Delaware River Basin Sites Map Data
Genesee River Basin Sites Map Data
St Lawrence River Basin Sites Map Data
Lake Champlain Basin Sites Map Data
Susquehanna River Basin Sites Map Data
Chemung River Basin Sites Map Data

First posted November 18, 2011

  • Recent Publications

    New!Reddy, J.E., 2014, Groundwater quality in Central New York, 2012: U.S. Geological Survey Open-File Report 2014–1226, 13 p.
    http://pubs.usgs.gov/of/2014/1226/

    New!Scott, T. and Nystrom, E.A., 2014, Groundwater quality in the Upper Hudson River Basin, New York, 2012: U.S. Geological Survey Open-File Report 2014–1084, 21 p.
    http://pubs.usgs.gov/of/2014/1084/

    Reddy, J.E., 2013, Groundwater quality in western New York, 2011: U.S. Geological Survey Open-File Report 2013–1095, 28 p.
    http://pubs.usgs.gov/of/2013/1095/

    Nystrom, E.A., and Scott, T., 2013, Groundwater quality in the Mohawk River Basin, New York, 2011: U.S. Geological Survey Open-File Report 2013–1021, 43 p.
    http://pubs.usgs.gov/of/2013/1021/

    Reddy, J.E., 2012, Groundwater quality in the Genesee River Basin, New York, 2010: U.S. Geological Survey Open-File Report 2012–1135, 29 p.
    http://pubs.usgs.gov/of/2012/1135/

    Reddy, J.E., and Risen, A.J., 2012, Groundwater quality in the Upper Susquehanna River Basin, New York, 2009: U.S. Geological Survey Open-File Report 2012–1045, 30 p.
    http://pubs.usgs.gov/of/2012/1045/

    Nystrom, E.A., 2012, Groundwater quality in the Delaware and St. Lawrence River Basins, New York, 2010: U.S. Geological Survey Open-File Report 2011-1320, 58 p.
    http://pubs.usgs.gov/of/2011/1320/

For additional information contact:
(1) Director
U.S. Geological Survey
Troy Program Office
New York Water Science Center
425 Jordan Road
Troy, NY 12180
(518)285-5600
http://ny.water.usgs.gov

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.




Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://ny.water.usgs.gov/projects/305b/index.html
Page Contact Information: USGS Publications Team
Page Last Modified: Thursday, 18-Dec-2014 10:49:18 EST