The Environmental Protection Agency (EPA) is responsible for setting and enforcing drinking water standards in the United States under the Safe Drinking Water Act.

The maximum contaminant level (MCL) for lead in drinking water, as set by the EPA, is 0.015 mg/L.

Fluoride is not a regulated contaminant under the Safe Drinking Water Act, although it is recommended by the EPA for its dental health benefits.

The purpose of the Total Maximum Daily Load (TMDL) program under the Clean Water Act is to set limits on the amount of pollutants that can be discharged into a waterbody.

Underground injection control (UIC) permits are not issued under the Clean Water Act, but rather under the Safe Drinking Water Act.

The primary goal of the Clean Water Act is to restore and maintain the chemical, physical, and biological integrity of the nation's waters.

Total maximum daily load (TMDL) is not a type of water quality standard, but rather a regulatory tool used to implement water quality standards.

The purpose of an antidegradation policy in water quality regulations is to prevent the degradation of water quality in high-quality waters.

Source monitoring is not a type of water quality monitoring, but rather a method of identifying the sources of pollutants in waterbodies.

The purpose of a water quality management plan is to identify and prioritize water quality problems, develop and implement strategies to address water quality problems, and monitor and assess the effectiveness of water quality management strategies.

Ecological modeling is not a type of water quality modeling, but rather a type of environmental modeling that focuses on the interactions between organisms and their environment.

The purpose of a water quality trading program is to allow facilities to trade pollution credits with each other, thereby providing a flexible and cost-effective way to achieve water quality goals.

Section 303(d) certification is not a type of water quality certification, but rather a list of impaired waters that require the development of total maximum daily loads (TMDLs).

The purpose of a water quality variance is to allow a facility to discharge pollutants in excess of water quality standards, typically under certain conditions and for a limited period of time.

Permit revocation is not a type of water quality enforcement action, but rather a regulatory action that can be taken against a facility that violates its permit.