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Langelier Saturation Indices Computed for U.S. Groundwater, 1991-2015; Water Well Data

Metadata Updated: October 28, 2023

The occurrence of metals, such as lead and copper, in household drinking supplies can often be a result of the corrosion of pipes and joints in water distribution systems. One measure of the potential for water to cause corrosion is the Langelier Saturation Index (LSI) (Langelier, 1936). The LSI is a measure of the potential for water to deposit a mineral layer (scale) within a water distribution system that can inhibit the corrosion of pipes and joints. Negative values of LSI suggest mineral deposition is not likely to occur while positive values indicate conditions favorable to mineral deposition. Negative values of LSI might be indicative of conditions that lead to elevated concentrations of metals, such as lead and cooper, in household water. The LSI was computed for groundwater samples from 20,962 locations in the United States. The data for the computations of LSI were obtained from the US Geological Survey (USGS) National Water Information System (NWIS). The data included in this report are for groundwater samples obtained during the period 1991-2015. At each location, the most recent sample (during the period 1991-2015) with the necessary measurements was used to compute the LSI. For the purposes of assessment (Langland and Dugas, 1996), LSI values less than -0.5 were classified as potentially corrosive; LSI values between -0.5 and 0.5 were classified as indeterminate; and LSI values greater than 0.5 were classified as scale-forming. Of the 20,962 sites, 31.5% were classified as potentially corrosive, 63 % were classified as indeterminate, and 5.4% as scale-forming. The values of LSI presented in this report can be used to identify which areas in the U.S. might be more susceptible to elevated concentrations of metals, such as lead and copper, in household drinking water and which areas may be less susceptible.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Created Date June 1, 2023
Metadata Updated Date October 28, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 28, 2023
Publisher U.S. Geological Survey
Maintainer
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Identifier USGS:56f30527e4b0f59b85df12fc
Data Last Modified 20200826
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://datainventory.doi.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id 1793f6df-8ada-4472-94f2-dff00bf179ac
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -159.3591,19.4431,-67.8691,61.6815
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 500fcd103154a186bb6da2772fa0d0562d38fa8fd4bd0e23838382a1a3506ca7
Source Schema Version 1.1
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