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Council hears technical debate on changing residential sewer laterals from 4-inch Schedule 40 to 6-inch SDR 26
Summary
City staff proposed changing residential sewer-lateral standards to 6-inch SDR 26 with gasketed joints; staff said the standard improves flexibility and reduces failures seen with glued joints, while public comment urged alternatives and questioned Metropolitan Sewer District practices and industry influence.
City staff presented a proposed amendment to O'Fallon's development code on July 10 to change required residential sanitary sewer laterals from 4-inch Schedule 40 pipe to 6-inch SDR 26 with gasketed joints.
Mr. Bender summarized the technical rationale: the change aligns O'Fallon with other sewer districts that use 6-inch SDR 26 laterals and allows gasketed joints, which provide flexibility against ground movement and thermal effects. "The exterior installation glued pipes…
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