RALEIGH — Nearly 29,000 gallons of sewage spilled from a stopped-up sewer line in Wake Forest on Thursday, according to the city of Raleigh’s public utilities department.

City officials say the pipe became clogged with a build-up of rags, predominantly disposable wipes. They say the spill had started about 24 hours before it was discovered at 8:40 a.m. Thursday.

The spill took place off Brewers Glen Court near Wait Avenue, and the sewage reached an unnamed tributary of Smith Creek. A city crew cleaned up the spill by 5 p.m. Thursday.

City officials say paper products other than toilet paper are a common source of clogged sewer lines, because they don’t also disintegrate. These include so-called “flushable” wipes. The city’s stance: only water, human waste, and toilet tissue are permitted in the sewer system.

Raleigh provides water and sewage services to several Wake County towns, including Wake Forest.