Non-potable water sources can include:

Untreated Surface Water: Water from rivers, lakes, ponds, or other natural bodies of water that has not undergone proper treatment to remove contaminants may be considered non-potable.

Contaminated Groundwater: Groundwater can become non-potable if it's contaminated with pollutants, such as heavy metals, chemicals, or pathogens.

Industrial or Agricultural Runoff: Water that has encountered industrial or agricultural pollutants, including chemicals, pesticides, and fertilizers, may be non-potable due to contamination.

Greywater: Used water from activities like laundry, dishwashing, or bathing, which may contain soaps and detergents, is considered non-potable but can be treated for non-drinking purposes like irrigation or flushing.

Rainwater (Untreated): While rainwater is naturally distilled, it can become non-potable if collected in a way that exposes it to contaminants, such as pollutants from roofs or other surfaces.

The World Health Organization (WHO) provides guidelines for safe drinking water quality, and many countries have established standards and regulations to ensure that the water supplied for consumption is safe. These standards cover factors such as microbial contamination, chemical pollutants, and physical properties.

It's essential to have access to clean and safe drinking water to prevent waterborne diseases and maintain overall health. If you're unsure about the safety of a water source, it's wise to rely on treated and tested drinking water from reliable sources, such as municipal water supplies or bottled water that meets regulatory standards.
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