toxic loading photo identifier

Control of Toxic Chemicals in Puget Sound

Phase 2: Improved Loading Estimates

Phase 2 built on the initial Phase 1 investigation by focusing on specific pathways and sources of toxic chemicals. These first two phases contributed to an improved understanding of toxic loadings into and movement within the Puget Sound ecosystem, and helped inform the development of the toxics reduction elements in the Puget Sound Partnership's 2020 Action Agenda ( - website is temporary unavailable as of 01/11/13).

Phase 2 findings improved our loading estimates for the following pathways:

  • Surface runoff
  • Wastewater discharges
  • Exchange with the ocean
  • Contaminated marine sediments

Some of these projects also furthered development of tools to predict the fate of contaminants in the Sound and their effects on humans.

Various parties conducted the studies in the seven sub-tasks described below, and the staff of the Puget Sound Partnership has been coordinating the synthesis of these studies.

Sub-Task Reports

(2A) Loadings from Surface Runoff and Roadways

(2B) Loadings from Dischargers of Municipal and Industrial Wastewater

(2C) Bioaccumulation Model Estimates of Toxics from Sediments

(2D) Water Column Data for Puget Sound and its Ocean Boundary

(2E) Support for a Human Health Risk Assessment

More information on several introductory studies that help assess the risks to human health from toxics.

(2F) Numerical Models of Polychlorinated Biphenyls (PCBs) in Puget Sound

(2G) Biological Observing System (TBiOS) for Toxics in Puget Sound

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Go to the clickable timeline