In the City of Redlands, residents can port clothes washing machine water into the yard (example above) without asking for a permit. (We recommend washing with "eco-friendly" laundry detergents, such as those made from plant-based ingredients, and avoiding cleaners with bleach, boron, and sodium).
Other gray water plumbing changes, such as those that re-direct water from the shower or kitchen sink, require approval through the Building and Safety Division but are do-able, especially if other plumbing work or renovation is planned.