Nyanza Chemical Waste Dump NPL Site

State TrusteeState of Massachusetts
Federal TrusteeDepartment of Commerce
AO Bureau

Also Known As


Incident Type




Case Status



Trolley Brook, Outfall Creek, Sudbury River


Contaminants of Concern Include

Affected DOI Resources Include

Migratory Birds

Financial Summary

Restoration Funds Collected:


*Restoration Funds Allocated:


*Restoration Funds Remaining:


* Restoration Funds can contain multiple settlements/projects. All collections are placed in interest bearing accounts. For detailed information on individual settlements/ projects please visit: NRDAR Status Report

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Case Description

The Nyanza Chemical Waste Dump is a 35-acre site located adjacent to an active industrial complex. Historical industrial operations at the site from 1917 to 1978 released large volumes of wastewater contaminated with acids, organic chemicals and inorganic chemicals. Of particular concern among the released hazardous substances is the chromium and mercury that were used as catalysts in the production of textile dyes. Over 45,000 tons of chemical sludges, together with spent solvents and other chemical wastes, were buried on the site. Some of these wastes were discharged to the Sudbury River. As a result, groundwater, soils, sediments and surface waters are contaminated with heavy metals and chlorinated organic compounds. The U.S. Environmental Protection Agency placed the Nyanza Chemical Waste Dump on the National Priorities List in 1983.

View looking east of remediated and restored eastern wetlands at Nyanza site, Credit: USEPA

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Case Documents

 Document TypeDocument NameDocument Date


 Restoration Plan and Environmental Assessment Restoration Plan and Environmental Assessment 05/07/2012

Map View

Case Contact

New England Ecological Services Field Office

Concord, NH | (603) 223-2541 | http://www.fws.gov/newengland/

Associated Restoration Projects

Case Trustees

AO Bureau
Federal TrusteeDepartment of Commerce
State TrusteeState of Massachusetts

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