Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

New WQX 3.0 profiles are available at waterqualitydata.us/beta/. These profiles will contain recent USGS data added since March 11, 2024, which marks the beginning of limited accessibility for USGS data. Read more about the 3.0 profiles and associated changes here.

This legacy user interface will continue to function for several weeks. However, this user interface only serves WQX2.2 profiles, which do NOT contain USGS data added after March 11, 2024.

WQP Home >  Providers >  NWIS >  USGS-IL >  USGS-401509089540401

21N 7W-21.7h (USGS-401509089540401) site data in the Water Quality Portal

Data Provider: NWIS (Learn more about Water Quality Portal Data Providers)

This well site, maintained by the USGS Illinois Water Science Center (identifier USGS-IL), has the name "21N 7W-21.7h" and has the identifier USGS-401509089540401. This site is in the watershed defined by the 8 digit Hydrologic Unit Code (HUC)07130008. See more details of this site the the USGS NWIS Web page for this site.

This site is located in Mason County County, Illinois at 40.26032069000000 degrees latitude and -89.8992803000000 degrees longitude using the datum NAD83. The horizontal location collection method was "Interpolated from MAP." and the accuracy is Unknown Unknown. The source map scale is 1:24000. This site is at an elevation of 499 feet and the accuracy of the elevation measurement, collected using the method "Interpolated from topographic map." is 2.5 feet. The vertical coordinate reference system is NGVD29.

This site is located in the "Sand and gravel aquifers (glaciated regions)" aquifer. The geologic formation type is Quaternary System. The aquifer is a Unconfined single aquifer type. The well was contructed on 19881021. The well depth is 115 ft. The well hole depth is 115 ft.

To download the metadata about this site along with water quality data, go to the Portal Page and enter "USGS-401509089540401" into the "Site ID" box under Site Parameters

What other monitoring locations are upstream or downstream from this one?

Upstream and downstream locations

This map shows all Water Quality Portal stations that are 10 miles upstream (dashed dark blue) and 10 miles downstream (solid light blue) of this monitoring location (indicated by the large blue circle). The upstream and downstream functionality is provided by the Network Linked Data Index.

When were data collected at this location?

Periods of record for data characteristic groups

For a more detailed breakdown of data, go to the Monitoring Report at the EPA How's My Waterway Application
Characteristic Group Date Range*
Information 2000 - 2000
Inorganics, Major, Non-metals 1991 - 2000
Nutrient 1991 - 2000
Organics, Other 1993 - 1993
Organics, Pesticide 1993 - 2000
Physical 1991 - 2000
Stable Isotopes 1993 - 1993
*Date ranges may contain gap years

What other information is available for this location?

Detailed Metadata

For the definitions of the metadata elements, please go to the Water Quality Portal user guide

Location Metadata Value
OrganizationIdentifier USGS-IL
OrganizationFormalName USGS Illinois Water Science Center
MonitoringLocationIdentifier USGS-401509089540401
MonitoringLocationName 21N 7W-21.7h
MonitoringLocationTypeName Well
HUCEightDigitCode 07130008
LatitudeMeasure 40.26032069000000
LongitudeMeasure -89.8992803000000
SourceMapScaleNumeric 24000
HorizontalAccuracyMeasure/MeasureValue Unknown
HorizontalAccuracyMeasure/MeasureUnitCode Unknown
HorizontalCollectionMethodName Interpolated from MAP.
HorizontalCoordinateReferenceSystemDatumName NAD83
VerticalMeasure/MeasureValue 499
VerticalMeasure/MeasureUnitCode feet
VerticalAccuracyMeasure/MeasureValue 2.5
VerticalAccuracyMeasure/MeasureUnitCode feet
VerticalCollectionMethodName Interpolated from topographic map.
VerticalCoordinateReferenceSystemDatumName NGVD29
CountryCode US
StateCode 17
CountyCode 125
AquiferName Sand and gravel aquifers (glaciated regions)
FormationTypeText Quaternary System
AquiferTypeName Unconfined single aquifer
ConstructionDateText 19881021
WellDepthMeasure/MeasureValue 115
WellDepthMeasure/MeasureUnitCode ft
WellHoleDepthMeasure/MeasureValue 115
WellHoleDepthMeasure/MeasureUnitCode ft
ProviderName NWIS