| Title (link to summary) | Number | Date (released or updated) |
|
Northwest Regional Office Addendum to Quality Assurance Project Plan A2 - Nonpoint Pollution Investigations in Western Washington - South Skagit Bay Water Quality Assessment
| 21-10-066 | December 2021 |
|
Quality Assurance Project Plan: PCBs in Washington State Products
| 21-03-121 | November 2021 |
|
Quality Assurance Project Plan for Puget Sound Watershed Characterization Technical Assistance
| 21-06-027 | October 2021 |
|
Quality Assurance Project Plan for Puget Sound Watershed Characterization Technical Assistance
| 21-06-026 | October 2021 |
|
Addendum 2 to Quality Assurance Project Plan: Measuring Mercury Trends in Freshwater Fish in Washington State
| 21-03-120 | October 2021 |
|
Quality Assurance Project Plan – Nonpoint Pollution Investigations in Western Washington
| 21-10-027 | September 2021 |
|
Addendum 2 to Quality Assurance Project Plan: Freshwater Fish Contaminant Monitoring Program, 2021: Lake Chelan
| 21-03-117 | September 2021 |
|
Quality Assurance Project Plan: Testing the Use of Biofilms to Measure PFAS in the South Fork Palouse River
| 21-03-116 | September 2021 |
|
Addendum 3 to Quality Assurance Project Plan: Prevalence and Persistence of Cyanotoxins in Lakes of the Puget Sound Basin
| 21-03-115 | September 2021 |
|
Quality Assurance Project Plan: PFAS Concentrations in Influent, Effluent, and Solids from Three Municipal Wastewater Treatment Plants in Washington State
| 21-10-048 | August 2021 |
|
Quality Assurance Project Plan Addendum 1: Freshwater Fish Contaminant Monitoring Program, 2019
| 21-03-114 | August 2021 |
|
Quality Assurance Monitoring Plan: Statewide River and Stream Ambient Water Quality Monitoring
| 21-03-109 | August 2021 |
|
Quality Assurance Project Plan: Flame Retardants in Electric and Electronic Casings
| 21-03-113 | July 2021 |
|
Quality Assurance Project Plan: Spokane River and Lake Spokane Dissolved Oxygen Total Maximum Daily Load 10-Year Effectiveness Monitoring Study
| 21-03-112 | July 2021 |
|
Quality Assurance Project Plan for the Photochemical Assessment Monitoring Stations (PAMS) Required Site Network for Speciated Volatile Organic Compounds, Carbonyls, and Meteorological Parameters Including Mixing Layer Height
| 21-02-012 | July 2021 |
|
Quality Assurance Project Plan for PCBs in General Consumer Products
| 13-04-008 | July 2021 |
|
Quality Assurance Project Plan: Lower Yakima Valley Groundwater Management Area (GWMA) Ambient Groundwater Monitoring Network
| 21-03-106 | June 2021 |
|
Lacamas Creek Bacteria, Temperature, and Nutrients Source Assessment QAPP
| 21-10-017 | May 2021 |
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Addendum to Quality Assurance Project Plan: Measuring Mercury Trends in Freshwater Fish in Washington State
| 21-03-111 | May 2021 |
|
Quality Assurance Project Plan: Survey of Phthalates in Washington State Waterbodies
| 21-03-110 | May 2021 |
|
Quality Assurance Project Plan: Lower Snohomish River Tributaries Fecal Coliform Bacteria Effectiveness Monitoring
| 21-03-107 | May 2021 |
|
Addendum to Quality Assurance Project Plan: Survey of PFAS in the Greater Lake Washington Watershed
| 21-03-105 | May 2021 |
|
Quality Assurance Project Plan: City of West Richland Phase 2a Well No.10.
| 21-12-007 | April 2021 |
|
Quality Assurance Monitoring Plan: Long-Term Marine Waters Monitoring, Water Column Program, 2020
| 21-03-108 | April 2021 |
|
Quality Assurance Project Plan: Groundwater Monitoring Well Installation 2020-2021: Washington Department of Ecology and the National Groundwater Monitoring Network
| 21-03-104 | March 2021 |
|
2021 Addendum to Quality Assurance Monitoring Plan: The Puget Sound Sediment Monitoring Program.2021 Addendum to Quality Assurance Monitoring Plan: The Puget Sound Sediment Monitoring Program.
| 21-03-101 | February 2021 |
|
Addendum 3 to Quality Assurance Project Plan: Wenatchee River PCB and DDT Source Assessment
| 21-03-103 | January 2021 |