What test evaluates operators for wastewater certification in Illinois?

The Illinois Environmental Protection Agency (IEPA) certification exam is the correct test that evaluates operators for wastewater certification in Illinois. This exam is specifically designed to ensure that operators have the necessary knowledge and skills to manage wastewater treatment processes effectively and comply with state regulations. The IEPA sets standards for wastewater operations and oversees the certification process to protect public health and the environment.

While the other options might relate to water quality or environmental standards, they do not specifically focus on the certification of wastewater operators. The IEPA certification exam is the recognized benchmark in Illinois for determining an operator's qualifications and competency in wastewater management.