检查井是用在建筑小区（居住区、公共建筑区、厂区等）范围内埋地塑料排水管道外径不大于800mm、埋设深度不大于6m，一般设在排水管道交汇处、转弯处、管径或坡度改变处、跌水处等，为了便于定期检查、清洁和疏通或下井操作检查用的塑料一体注塑而成或者砖砌成的井状构筑物。

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