What detailed plans must be submitted to the Department before altering plumbing in a house?

Before altering plumbing in a house, it is essential to submit detailed Water Supply and Sewage Disposal Plans to the Department. These plans are crucial because they outline the specific plumbing systems involved, including how water will be supplied to various fixtures and how wastewater will be disposed of. Properly designed water supply plans ensure that safe and adequate drinking water is accessible, while sewage disposal plans help prevent contamination and ensure compliance with health regulations.

Submitting these plans is a legal requirement in many jurisdictions to ensure that any plumbing modifications adhere to local codes, prevent system failures, and protect public health. The other options, such as electrical system plans, interior design plans, or building layout plans, do not specifically address the plumbing aspects necessary for assessing the safety and efficiency of water and sewage systems in the context of plumbing alterations.