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Substance Identification Information from EPA's Substance Registry

Metadata Updated: March 16, 2024

The Substance Registry Services (SRS) is the authoritative resource for basic information about substances of interest to the U.S. EPA and its state and tribal partners. Substances, particularly chemicals, can have many valid synonyms. For example, toluene, methyl benzene, and phenyl methane, are commonly used names for the same chemical. EPA programs collect environmental data for this chemical using each of these names, plus others. This diversity leads to problems when a user is looking for programmatic data for toluene but is unaware that the data is stored under the synonym methyl benzene. For each substance, the SRS identifies the statutes, EPA programs, as well as organization external to EPA, that track or regulate that substance and the synonym used by that statute, EPA program or external organization. Besides standardized information for each chemical, such as the Chemical Abstracts Services name and the Chemical Abstracts Number and the EPA Registry Name (the EPA standard name), the SRS also includes additional information, such as molecular weight and molecular formula. Additionally, an SRS Internal Tracking Number uniquely identifies each substance, enabling cross-walking between synonyms.

EPA is providing a large .ZIP file providing the SRS data in CSV format, and a separate small metadata file in XML containing the field names and definitions.

Access & Use Information

Public: This dataset is intended for public access and use. License: See this page for license information.

Downloads & Resources



Metadata Created Date December 3, 2020
Metadata Updated Date March 16, 2024

Metadata Source

Harvested from OEI-OIC Non-Geo Records

Additional Metadata

Resource Type Dataset
Metadata Created Date December 3, 2020
Metadata Updated Date March 16, 2024
Publisher U.S. EPA Office of Mission Support (OMS)
Identifier 0AEA7FA5-98C2-4175-AE3E-E70947456E86
Data First Published 2014-01-01
Data Last Modified 2014-01-01
Public Access Level public
Bureau Code 020:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 07f62f5d-3ba9-494b-8924-7f50faa31dcc
Harvest Source Id c9917860-d5d5-4b23-acc3-45c74ce30142
Harvest Source Title OEI-OIC Non-Geo Records
Homepage URL
Old Spatial -180.0,18.0,-66.0,72.0
Program Code 020:072
Related Documents,
Source Datajson Identifier True
Source Hash 47569b8cc27c18ffeb782ad993e27dfcc456cb13eadd4d098f4fa3b132bf76e6
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -180.0, 18.0, -180.0, 72.0, -66.0, 72.0, -66.0, 18.0, -180.0, 18.0}

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