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Ground-Water Quality in the Mohawk River Basin, New York, 2006

Entry ID: USGS_OFR_2008_1086

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Summary

Abstract: Water samples were collected from 27 wells from August through November 2006 to characterize ground-water quality in the Mohawk River Basin. The Mohawk River Basin covers 3,500 square miles in central New York; most of the basin is underlain by sedimentary bedrock, including shale, sandstone, and carbonates. Sand and gravel form the most productive aquifers in the basin. Samples were collected ... from 13 sand and gravel wells and 14 bedrock wells, including production and domestic wells. The samples were collected and processed through standard U.S. Geological Survey procedures and were analyzed for 226 physical properties and constituents, including physical properties, major ions, nutrients, trace elements, radon-222, pesticides, volatile organic compounds, and bacteria.

Many constituents were not detected in any sample, but concentrations of some constituents exceeded current or proposed Federal or New York State drinking-water quality standards, including color (1 sample), pH (2 samples), sodium (11 samples), chloride (2 samples), fluoride (1 sample), sulfate (1 sample), aluminum (2 samples), arsenic (2 samples), iron (10 samples), manganese (10 samples), radon-222 (12 samples), and bacteria (6 samples). Dissolved oxygen concentrations were greater in samples from sand and gravel wells (median 5.6 milligrams per liter [mg/L]) than from bedrock wells (median 0.2 mg/L). The pH was typically neutral or slightly basic (median 7.3); the median water temperature was 11°C. The ions with the highest concentrations were bicarbonate (median 276 mg/L), calcium (median 58.9 mg/L), and sodium (median 41.9 mg/L). Ground water in the basin is generally very hard (180 mg/L as CaCO3 or greater), especially in the Mohawk Valley and areas with carbonate bedrock. Nitrate-plus-nitrite concentrations were generally higher samples from sand and gravel wells (median concentration 0.28 mg/L as N) than in samples from bedrock wells (median < 0.06 mg/L as N), although no concentrations exceeded established State or Federal drinking-water standards of 10 mg/L as N for nitrate and 1 mg/L as N for nitrite. Ammonia concentrations were higher in samples from bedrock wells (median 0.349 mg/L as N) than in those from samples from sand and gravel wells (median 0.006 mg/L as N). The trace elements with the highest concentrations were strontium (median 549 micrograms per liter [¼g/L]), iron (median 143 ¼g/L), boron (median 35 ¼g/L), and manganese (median 31.1 ¼g/L). Concentrations of several trace elements, including boron, copper, iron, manganese, and strontium, were higher in samples from bedrock wells than those from sand and gravel wells. The highest radon-222 activities were in samples from bedrock wells (maximum 1,360 pCi/L); 44 percent of all samples exceeded a proposed U.S. Environmental Protection Agency drinking water standard of 300 pCi/L. Nine pesticides and pesticide degradates were detected in six samples at concentrations of 0.42 ¼g/L or less; all were herbicides or their degradates, and most were degradates of alachlor, atrazine, and metolachlor. Six volatile organic compounds were detected in four samples at concentrations of 0.8 ¼g/L or less, including four trihalomethanes, tetrachloroethene, and toluene; most detections were in sand and gravel wells and none of the concentrations exceeded drinking water standards. Coliform bacteria were detected in six samples but fecal coliform bacteria, including Escherichia coli, were not detected in any sample.

[Summary provided by the USGS.]

Related URL

Link: GET DATA

Description: Get report on Ground-Water Quality in the Mohawk River Basin, New York, 2006.

Geographic Coverage

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Spatial coordinates

N: 44.0

S: 42.0

E: -73.0

W: -76.0

Data Set Citation

Dataset Originator/Creator: Elizabeth A. Nystrom

Dataset Title: Ground-Water Quality in the Mohawk River Basin, New York, 2006

Dataset Series Name: USGS Open File Report

Dataset Release Date: 2008

Dataset Publisher: USGS

Issue Identification: OFR 2008-1086

Online Resource: http://pubs.usgs.gov/of/2008/1086/

Location Keywords

CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW YORK

Science Keywords

TERRESTRIAL HYDROSPHERE > GROUND WATER

TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > ACID DEPOSITION

Ancillary Keywords

OFR

Open File Report

Data Set Progress

COMPLETE

Originating Center

Data Center

New York Water Science Center, U.S. Geological Survey, U.S. Department of the Interior

Data Center URL: http://ny.water.usgs.gov/

Data Center Personnel
Name: NEW YORK WATER SCIENCE CENTER Phone: (518)285-5600 Email: dc_ny at usgs.gov Contact Address: 425 Jordan Road City: Troy Province or State: NY Postal Code: 12180 Country: USA