Native plants have adapted to a specific area over a defined time period and are not invasive. In the US, the term often refers to plants growing in a region prior to the arrival of European settlers.

Non-potable water is not fit for consumption without treatment that meets or exceeds EPA drinking water standards. Graywater and rainwater are non-potable waters that can be used in toilets, for washing cars, etc. and the use of either reduces the demand for potable water, conserving this vital resource.