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Wastewater Treatment System Groundwater Assessment for Edison, Washington

Publication number Date Published
18-03-007April 2018
VIEW NOW Wastewater Treatment System Groundwater Assessment for Edison, Washington (Number of pages: 130) (Publication Size: 6455KB)

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Author(s) Carey, B.
Description The Department of Ecology conducted a study of groundwater and effluent at the Edison Wastewater Treatment System in Edison, WA. The purpose of the study was to:
• Establish background water quality for nitrate-N, fecal coliform bacteria (FC), and total coliform bacteria (TC) for comparison with conditions downgradient of the drainfields.
• Assess whether Washington State Ground Water Standards (Chapter 173-200 WAC) are being met.
• Reassess performance with regard to antidegradation of water quality

FC and TC results were mostly below detection in groundwater except for February and April 2016, when TC were found in all wells, including the upgradient well. The maximum nitrate-N concentration observed in groundwater was 3.10 mg/L, roughly one-third of the 10 mg/L Ground Water Standard.
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Keywords fecal coliform bacteria, groundwater monitoring, wastewater treatment, on-site sewage, nitrate, chloride, total coliform bacteria, saline groundwater
WEB PAGE Edison groundwater assessment
WATERSHED Water Resource Inventory Area 03 Lower Skagit-Samish
DATA Environmental Information Management (EIM) #bcar006


Quality Assurance Project Plan: Edison Large On-site Sewage System Groundwater Assessment