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Black Water from Sewage Or Other Contaminated Water
Grossly unsanitary or "black" water sources are those that arise from sewage or other contaminated water entering a structure. Sewage or other or other contaminants the expected urine and feces, but it also could contain dangerous chemicals or medical wastes. Toilet backflows that originate from beyond the toilet trap are considered to be Category 3 (black) water situations, regardless visible content or color. This category includes all forms of sea water, ground surface water, and rising water from rivers or streams. They carry silt and organic material into structures and create category 3 "black water" situations.
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