La. Stat. tit. 33 § 4117
Whenever any lot or portion of real property affected by the drainage lien provided for herein is sold for the unpaid city or state real estate taxes due thereon, or taxes due other taxing authorities, and is adjudicated to the city or state, or other taxing authorities, or to an individual, the fact of said adjudication shall not have the effect of cancelling the lien and privilege hereby authorized, by confusion or otherwise, but such lien and privilege shall continue in full force and effect and be enforceable against such lot or portion of real property until the assessment or assessments, plus interest and penalties are fully paid and satisfied. Nor shall the sale of property by the city of New Orleans for the benefit of the sewerage and water board to enforce the drainage lien herein provided for have the effect of cancelling unpaid city, state, federal taxes, or taxes due to other governmental agencies.
La. R.S. § 33:4117