This report on the basic fertilizer chemicals segment of the fertilizer manufacturing industry analyzes the economic impacts of water pollution controls. Under the provisions of Sections 304 and 306 of the Federal Water Pollution Control Act, EPA has proposed effluent guidelines for basic fertilizer chemicals plants. The purpose of this study is the evaluation of potential economic impacts resulting from the implementation of the effluent guidelines. The evaluation approach used is generally one of describing and analyzing the industry in terms of structure; number and types of firms and plants; location, age and technology of plants; financial data for model or representative plants; and pricing practices and supply-demand relationships. Then, pollution control costs are super-imposed on the model plant profiles to determine micro-economic effects, such as price increases expected and potential closures. Macro impacts on the industry are then analyzed for effects on employment, communities, balance of payments and related matters.