Jump to main content.

Naval Industrial Reserve Ordinance Plant (NIROP)

Site Information

Enlarge map

Contact Information

Community Involvement Coordinators
Patricia Krause (krause.patricia@epa.gov)
312-886-9506 or 800-621-8431, ext. 69506

Remedial Project Manager
Sheila Desai (desai.sheila@epa.gov)
312-353-4150 or 800-621-8431, ext. 34150


(where to view written records)



The Naval Industrial Reserve Ordnance Plant (NIROP) site is an 83-acre site located about 700 feet east of the Mississippi River in Fridley, Minnesota. The U.S. Navy and its contractors have produced advanced weapons systems at the facility since 1940. In 1981, trichloroethylene (TCE) was discovered in on-site groundwater wells and in the city of Minneapolis's drinking water treatment plant intake pipe, which is now located in the Mississippi River about 4,900 feet downstream from the site. There were no existing federal drinking water standards for TCE in 1981, but the wells on the NIROP site were shut down in April 1981 as a precautionary measure.

The Navy, USEPA, and MPCA began environmental investigations at NIROP in 1983 and work continues today. The environmental cleanup program at NIROP identified volatile organic compound (VOC) contamination in both soil and groundwater. Soil investigations were conducted by the Navy on the land outside the NIROP building in 1983, 1992, and 1996, resulting in the removal and off-site disposal of 2,200 cubic yards of soil and 97 drums and 12 small containers of waste that were found buried on the site.

See Full Background

Site Updates | Latest Update | Fact Sheets || Technical Documents || Five-Year Reviews || Legal Agreements

You will need the free Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.

Site Updates

December 2013 Update

EPA reviewed the fourth five-year review (223pp, 1MB) for the Naval Industrial Reserve Ordinance Plant (NIROP) and partially concurred with the Navy’s determinations for the site. Three operable units (OUs), a term for separate activities at a Superfund site, are identified at NIROP Fridley. Groundwater is identified as OU1; the land outside of the main NIROP manufacturing building is identified as OU2; and the land under the main NIROP building is identified as OU3.

EPA concurs with the Navy’s “short-term protective" determination for OU1 and sitewide. EPA also concurs with a “protective” determination for OU2 and OU3. EPA does not concur with the narrative protectiveness statements for OU1 and sitewide as they do not specify the actions necessary for the cleanup to protect in the long term.

Based on the review EPA recommends the following be carried forward as issues and recommended actions:

Fact Sheets

Top of page

Technical Documents

Top of page

Five-Year Reviews

Top of page

Top of page


Local Navigation

Jump to main content.