An environmental impact report on San Diego’s nearly $3 billion plan to recycle wastewater into drinking water will go before the City Council’s Environment Committee Wednesday. Supporters of the so-called “Pure Water San Diego” program say it will provide residents and businesses with a stable, local supply of potable water that won’t be affected by drought or the uncertainties of future imports. The product will be purified and mixed with water from traditional sources before it’s delivered to customers.