Washington State Department of Ecology


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Groundwater - Water Quality (29 publications 1965-2024)


Title (link to summary)NumberDate (released or updated)
Lower Issaquah Valley PFAS Cleanup Sites Postcard 2024 24-09-171April 2024
Lower Issaquah Valley PFAS 清理点 24-09-170ZHApril 2024
Lower Issaquah Valley PFAS 清理点 24-09-170HIApril 2024
Sitios de limpieza de PFAS en el Lower Issaquah Valley 24-09-170ESApril 2024
Lower Issaquah Valley PFAS Cleanup Sites Fact Sheet 2024 24-09-170April 2024
Proteja el agua de su pozo 24-03-009ESApril 2024
Protect Your Well Water - ENG 24-03-009April 2024
Focus On: Concentrated Animal Feeding Operation Permit 17-10-002December 2022
POSTER: Incorporating Washington State Groundwater Information into the National Ground-Water Monitoring Network 22-03-017May 2022
Focus On: Water Quality Assessment 21-10-015April 2021
Focus on: Drinking Water Well Tests in the Lower Yakima Valley 21-03-012April 2021
Quality Assurance Project Plan: Groundwater Monitoring Well Installation 2020-2021: Washington Department of Ecology and the National Groundwater Monitoring Network 21-03-104March 2021
Quality Assurance Project Plan: Sumas-Blaine Surficial Aquifer Long-Term Ambient Groundwater Monitoring 19-03-114November 2019
POSTER: Changes in Nitrate-N Concentration in the Sumas-Blaine Aquifer between 1997 and 2018 19-03-006April 2019
Yakima Railroad Area PCE Contamination: Groundwater Quality Performance Monitoring Data Summary 2017 18-03-027July 2018
Wastewater Treatment System Groundwater Assessment for Edison, Washington 18-03-007April 2018
Economic Impact Analysis: Final Concentrated Animal Feeding Operation General Permit 17-10-001January 2017
Inland Empire Paper Company Nutrients and Common Ions: Source Water Study 16-03-023June 2016
Quality Assurance Project Plan: Sumas-Blaine Aquifer Nitrate Contamination Summary 11-03-111October 2011
Quality Assurance Project Plan: Hangman Hills Sewage Treatment Plant Nutrient Loading and Groundwater Study 10-03-116September 2010
Quality Assurance Project Plan: Sumas-Blaine Surficial Aquifer Long-Term Ambient Groundwater Monitoring 09-03-111April 2009
Nitrate Trends in the Central Sumas-Blaine Surficial Aquifer 08-03-018July 2008
Quality Assurance Project Plan: Bertrand Creek and Meadowdale Areas (Whatcom County) Follow-Up Study of EDB and 1,2-DCP in Residential Wells. 07-03-102January 2007
Water in the Skagit River Basin, Washington WSB 47January 1978
Geology and water resources of the San Juan Islands, San Juan County, Washington WSB 46January 1975
Water in the Palouse River Basin, Washington WSB 39January 1975
Water in the Okanogan River Basin, Washington WSB 34January 1974
Preliminary investigation of the geology and ground-water resources of the lower Chehalis River Valley and adjacent areas, Grays Harbor County, Washington WSB 30January 1966
Ground water in Washington -- its chemical and physical quality WSB 24January 1965

 

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