Blackwater

She began talking of the way they had died – blackwater, malaria, a neglected appendix.

Source: wiktionary

Ms. Conlin failed to report, among other things, that air emissions are regulated and that our industry is exploring new technologies to further reduce emissions; that our ships treat all blackwater; and that advanced wastewater purification systems discharge water cleaner than most municipal water treatment plants.

Source: wiktionary

The principal water-barrier of this type is the muddy estuary of the tidal River Blackwater, which is last bridged in the seaward direction at the ancient town of Maldon. […] In those days, yachting on the east coast was a favourite relaxation, and it was proposed to extend the line for 1¾ miles to a pier on the River Blackwater, where yachts could be moored.

Source: wiktionary