在不断变化的饮用水法规期间，面对扩大水处理能力的迫切需要，凤凰城授权对全系统消毒实践和地表水处理流程和程序进行研究。水质总体规划（WQMP）开发的一个关键要素是评估成本与水质（根据消毒副产品定义）之间的关系，为水质提供增量改善的各种处理方案。针对预计水质要求会发生变化的区域，确定了替代处理策略。进行了实验室和中试规模的工艺研究，以确定每种替代策略可实现的地表水质量改善。建立了概念设计参数，以便为每个水处理厂的战略实施制定现实的预算成本估算。 利用预期的水质结果、成本估算和非财务因素分析，对每种备选策略进行了批判性评估。根据这些评估和项目研讨会讨论，为地表水处理厂制定了水质改善计划。本文概述了该计划的发展。WQMP中详细介绍了可治疗性测试结果和成本估算。

Faced with the immediate need to expand water treatment capacity during a period of changing drinking water regulations, the City of Phoenix authorized a study of system-wide disinfection practices and surface water treatment processes and procedures. A key element of the Water Quality Master Plan (WQMP) development was an evaluation of the relationship between cost and water quality (defined in terms of disinfection byproducts) for a wide range of treatment options offering incremental improvements in water quality. Alternative treatment strategies were identified for those areas where changes in water quality requirements are anticipated. Bench and pilot-scale process studies were conducted to identify the improvements in surface water quality which could be achieved by each alternative strategy. Conceptual design parameters were established to permit the development of realistic budgetary cost estimates for implementing the strategies at each water treatment plant. Utilizing the anticipated water quality results, costs estimates and the analysis of non-financial factors, each of the alternative strategies was critically evaluated. Based on these evaluations and project workshop discussions, a plan of water quality improvements was established for the surface water treatment plants. This paper presents a summary of the development of the plan. A detailed presentation of the treatability testing results and costs estimates can be found in the WQMP.