water mixed with waste matter
"The factory's outdated pipes leaked toxic effluent into the nearby stream, killing the fish within hours."
A stream that flows out, such as from a lake or reservoir; an outflow; effluence.
"The old dam was reinforced to safely contain the sudden surge of water flowing out as the reservoir's primary effluent."
that is flowing outward
"The river turned murky as the factory's waste effluent flowed outward into the waterway, threatening local wildlife."
Flowing out; outflowing.
"The river's current carried a steady stream of effluent from the factory into the bay."