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Report: Groundwater Quality Assessment and Proposed Objectives for the Osoyoos Aquifer
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A groundwater quality assessment was conducted for the Osoyoos Aquifer, adjacent to the western shore of Osoyoos Lake, BC. The overall groundwater quality is generally within the Canadian drinking water guidelines. Groundwater in the Osoyoos Aquifer is affected by elevated levels of nitrate and dissolved phosphorus. Water quality objectives are proposed to protect groundwater uses for drinking water supply and aquatic life protection in Osoyoos Lake.
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Author: Klaus Rathfelder, Linda Gregory
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Date Published: Nov 2019
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Report ID: 57603
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Audience: Government and Public
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A groundwater quality assessment was conducted for the Osoyoos Aquifer (Aquifer 193), which is adjacent to the western shore of Osoyoos Lake, BC. The overall groundwater quality is generally within the Canadian drinking water guidelines for protection of human health. However, groundwater in the Osoyoos Aquifer is affected by elevated levels of nutrients. Nitrate was detected above background levels in 92% of samples and exceeded drinking water guidelines in some wells. Dissolved phosphorus concentrations exceed the water quality objective for Osoyoos Lake in most samples. Potential nutrient sources include fertilizer application in agricultural areas and residential landscaping, septic systems in rural areas, and reclaimed wastewater irrigation areas and infiltration facilities. Water quality objectives are proposed to protect groundwater uses for drinking water supply and aquatic life protection in Osoyoos Lake. The proposed objective for nitrate is 10 mg-N/L, consistent with the BC source drinking water quality guideline. The proposed objective for dissolved phosphorus is 0.15 mg/L, consistent with the water quality objective for Osoyoos Lake after a 1:10 dilution in the transition from groundwater to surface water.
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Report Type
Subject
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Region - Okanagan |
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Watershed Groups - 310 - Okanagan |
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Water Information - Groundwater |
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