The distribution box is intact
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Clean a distribution box when outlets are clogged, but the structure is intact, and the box sits level. Replace it when the box is cracked, tilted beyond repair, or over 30 years old and experiencing recurring failures. A septic distribution box (D-box) is a concrete or plastic junction that evenly distributes wastewater from your septic tank to all drainfield lateral lines. When it fails, symptoms include uneven wet spots in the yard, slow indoor drains, and sewage odors.