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Definitions

septic tank

[sep-tik tangk] / ˈsɛp tɪk ˌtæŋk /
NOUN
system for sewage disposal
Synonyms
STRONGEST
cesspool sewer
WEAK
catchbasin cesspit septic system sewage-disposal tank sump

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

At one point, the cave faced a potential threat when someone attempted to develop the land and convert the cave into a septic tank.

From Science Daily • Apr. 3, 2026

Tougher controls over the spreading of sewage and septic tank sludge to land as fertiliser in farming are also proposed, as are limits on using digestate from anaerobic digestion plants.

From BBC • Feb. 3, 2026

She’s renovating the property to bring it up to seismic and ADA standards, harden it against wildfires and install a septic tank for a guest house.

From Los Angeles Times • Aug. 30, 2025

One hopes your plumber installed the pipes with sufficient slope, so the water and solids make it to the city sewer or your septic tank with no issues.

From Seattle Times • Nov. 27, 2023

Her form shivered and the ghosts disappeared, leaving us alone with a pit, a Happy Flush septic tank, and a cold full moon.

From "The Battle of the Labyrinth" by Rick Riordan