This type originates from sanitary sources like broken water supply lines, overflowing sinks, or rainwater leaking through roofs. While it poses minimal health risks initially, clean water can quickly deteriorate to category 2 if left untreated for more than 24-48 hours, as bacteria begin to grow in the moisture.
Gray water contains significant contamination and can cause discomfort or illness if ingested. Common sources include:
Dishwasher or washing machine
Toilet overflow with urine
Sump pump failures
Hydrostatic pressure
The most dangerous form, black water, is grossly contaminated and contains pathogens that can cause serious illness or death. This includes:
Sewage backups
Rising floodwater from rivers or streams
Standing water supporting microbial growth
Groundwater seepage