On-site sewage disposal systems are used in rural areas where houses are spaced so far apart that a sewer system would be too expensive to install, or in areas around cities where the city government has not yet provided sewers to which the homes can connect.
AFFECT is a verb, and means to influence or change.. EFFECT is a noun, and means the result, consequence, or change that is made. The two words are often confused, even moreso because effect can be a verb, rarely but noticeably used, specifically with the word change. If the word is used as an action, you will almost always use affect.
Affect is the visible reaction a person displays toward events. Mood is the underlying feeling state. Affect is described by such terms as constricted, normal range, appropriate to context, flat, and shallow. Mood refers to the feeling tone and is described by such terms as anxious, depressed, dysphoric, euphoric, angry, and irritable.