Representatives of Miami-Dade County’s water and sewer department will hold three public briefings — the first on Monday night — to share information on the crumbling sewage system and the $1 billion-plus in improvements needed to meet federal standards.

Water and sewer managers have been negotiating with federal authorities since May over badly needed repairs to the county’s 13,000 miles of pipes and six water treatment plants. That was when the Environmental Protection Agency and U.S. Justice Department announced the county had violated sections of the Clean Water Act, along with terms and conditions of its National Pollutant Discharge Elimination Systems permit.

Water and Sewer Director John Renfrow recently informed county commissioners the system requires a 12-year, $12 billion overhaul to fix corroding water and sewer lines and decaying water treatment facilities.

The public meetings, all scheduled to begin at 7 p.m., are required by the EPA, Renfrow said. Federal authorities are not expected to participate.

Monday’s meeting is at the Joseph Caleb Center, 5400 NW 22nd Ave. Tuesday’s will be held at the South Dade Government Center, 10710 SW 211th St. The final meeting is Thursday at water and sewer’s Douglas Building, 3071 SW 38th Ave.

CHARLES RABIN