Lead can be used on pipes, pipe fittings, plumbing fittings, or fixtures that are two (2) inches in diameter or larger and used exclusively for ______ services.

Lead can be utilized in pipes and fittings that are two inches in diameter or larger exclusively for non-potable services. Non-potable water refers to water that is not safe for human consumption, such as water used for irrigation, industrial processes, or sewage systems. The use of lead in plumbing applications is heavily restricted and regulated because of health risks associated with lead exposure, especially from drinking water sources.

In this context, specifying that lead can only be used in non-potable services helps to minimize these health risks, as plumbing intended for human consumption must meet strict safety standards and typically cannot contain lead. Options relating to potable water, waste, or greywater would not align with the intention behind the restrictions on lead usage. Potable water systems must comply with regulations that prohibit lead due to the risk it poses to public health. Waste and greywater systems generally refer to either contaminated or treated water systems that aren't intended for safe consumption, but even these may have guidelines that limit lead use depending on local regulations.