SAN ANTONIO—San Antonio Water System plans to replace a problematic 6-mile-long wastewater pipe on the city's east side.

Monday's heavy rains caused another sewage spill at Salado Creek. SAWS officials said the problem is a section of aging pipeline that runs north and south on the city's east side parallel to the creek. Rains penetrated the main line Monday, forcing raw sewer water into the creek.

Around 100,000 gallons of sewage spilled.

"We know though, any sewage spill is a bad sewage spill. So we're going in to replace a large portion of pipe, going all up and down the east side of the city,” said Anne Hayden, with SAWS.

SAWS plans to start replacing the line early next year. A second phase of the project will start in 2018. The whole thing should cost about $63 million. In the meantime, SAWS crews are busy with the cleanup.