DALLAS — Repairing and replacing New Orleans’ damaged and obsolete water utility infrastructure will require more than $1 billion of new revenue debt by 2020 and a doubling of customer rates to finance and operate the water, sewer and drainage networks, a report warns.

The report released Tuesday by the New Orleans Sewerage and Water Board listed $3.48 billion of needed system upgrades and improvements. The analysis by Raftelis Financial Consultants Inc. said the utility does not have the revenue or funding in place to support the necessary work.

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