§ 18-250. Sewer line trap.

(a)

Whenever a building sewer serving an underground structure conveys sanitary sewage to a public sewer, a trap shall be installed on the main sewer line outside the underground structure. The purpose of the trap is to prevent odors, gases and pests from entering the subsurface structure plumbing system from the public sewer and the trap is not to be used as a ventilating duct for the public sewer.

(b)

A fresh-air inlet shall be connected on the upstream side of this trap so as not to interfere with the cleanouts therein. The upper end of the fresh-air inlet shall terminate in a protected area at least 20 feet (6.1 m) from a portal or other opening into the underground structure. The upper end of the inlet shall be turned down and shall be provided with a substantial protected screened cover. The air inlet must be sized properly and must remain open in order to maintain fixture trap seals in the plumbing system.

(Ord. No. 040477, § 1, 8-12-04; Ord. No. 071193, § 1, 1-3-08; Ord. No. 120375, § 1, 5-24-12)