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United States Register of Introduced and Invasive Species (US-RIIS)


Effective Date
Publication Date


Simpson, A., Turner, R., Blake, R., Liebhold, A., and Dorado, M., 2021, United States Register of Introduced and Invasive Species: U.S. Geological Survey data release,


(THIS VERSION HAS BEEN SUPERSEDED by US-RIIS V2.0, November 2022, available at Introduced (non-native) species that becomes established may eventually become invasive, so tracking introduced species provides a baseline for effective modeling of species trends and interactions, geospatially and temporally. The United States Register of Introduced and Invasive Species (US-RIIS) is comprised of three lists, one each for Alaska (AK, with 532 records), Hawaii (HI, with 6,075 records), and the conterminous United States (L48, with 8,657 records). Each list includes introduced (non-native), established (reproducing) taxa that: are, or may become, invasive (harmful) in the locality; are not known to be harmful [...]


Attached Files

Click on title to download individual files attached to this item.

“US-RIIS v1.0, xlsx, superseded”
3.18 MB application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
“US-RIIS v1.0, csv-zipped, superseded”
1.06 MB application/zip
“Data mgmt plan, US-RIIS v1.0, superseded”
249.1 KB application/pdf

Material Request Instructions

(THIS VERSION HAS BEEN SUPERSEDED by US-RIIS V2.0, 2022) The database is available for download on this page as a Microsoft Excel workbook (with 3 sheets) and as three UTF-8 .csv text files (compressed in one .zip file). There is also a .pdf of the data management plan and an .xml of the FGDC metadata record. In addition, an informal unofficial watch list of non-native species not yet known to be established in the U.S. is available upon request. Please contact for details.


The purpose of the US-RIIS is to inform policy makers, land managers, the scientific community, and the public about which introduced (non-native) taxa are currently established (with reproducing populations) in Alaska, Hawaii, and/or the conterminous United States. Before becoming an invasive species that causes harm, a taxon must be both introduced and established. This species register catalogs introduced established species and provides a basis for prioritizing and managing invasive species in the United States. We anticipate the US-RIIS will be used to 1) generate species lists for horizon scanning, 2) create introduced species lists for smaller areas within the U.S., and 3) tag species occurrence data records with an introduced status where the species may not have been initially reported as introduced. The US-RIIS also contributes to the Global Register of Introduced and Invasive Species (, and is a species list dataset to be periodically updated with the Global Biodiversity Information Facility (


(THIS VERSION HAS BEEN SUPERSEDED by US-RIIS V2.0, November 2022) Creative Commons License CC0 (Public Domain). DISCLAIMER FOR APPROVED DATABASE: This database is identified as U.S. Register of Introduced and Invasive Species for release by the U.S. Geological Survey (USGS). Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the database is released on condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use. GENERAL DISCLAIMER: Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Hypertext links and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty by the USGS, U.S. Department of the Interior, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.

Additional Information


Type Scheme Key
DOI doi:10.5066/P95XL09Q

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