According to the S500, which of the following is considered Category 1 water?

Category 1 water is classified as clean water and poses little to no risk of infection. This category typically includes water that comes from a clean source and has not been contaminated by any harmful microorganisms or chemicals. Water from sources such as rainwater, water supply lines, and similar clean sources fall into this category, making it safe for humans and equipment.

In contrast, the other options present sources of water that may contain contaminants or pose health risks. Contaminated water from a broken toilet tank, surface water from rising rivers, and water from a dishwasher typically involve varying degrees of contamination, which would result in their classification as Category 2 or Category 3 water, depending on the specific circumstances and level of contamination. Understanding these classifications is essential for proper remediation practices and ensuring safety during microbial remediation processes.