UnverifiedLouisville’s building department has not confirmed this yet. Based on the city code as researched Sep 28, 2026.
Why this is required in Louisville
Your plumber shared this so you can see the local rule behind their recommendation.
Depth of the building sewer below finished grade.
In plain English
The sewer line that carries wastewater out of a building must be buried at least 36 inches (3 feet) below the finished ground level.
This applies to every building sewer in Louisville, including where it connects to a septic tank. Burying the line deeper helps protect it from freezing and damage.
Louisville rule vs. standard code
Official source
Ord. No. 1907-2025, § 7, adopted Nov 3, 2025
Questions? Ask your plumber
Why this is required in Louisville
Your plumber shared this so you can see the local rule behind their recommendation.
Depth of the building sewer below finished grade.
In plain English
The sewer line that carries wastewater out of a building must be buried at least 36 inches (3 feet) below the finished ground level.
This applies to every building sewer in Louisville, including where it connects to a septic tank. Burying the line deeper helps protect it from freezing and damage.
Louisville rule vs. standard code
Official source
Ord. No. 1907-2025, § 7, adopted Nov 3, 2025