The dyeing sector of the textile industry alone consumes over six trillion liters of water a year. The only industries that consume more water than the textiles are energy and agriculture.
In many instances, wastewater from the dye industry is directly pumped into surface waters without treatment. This waste effluent carries a wide variety of chemicals arising from the processing of dyes.
All dyes used in the industry, even natural dyes, require the use of harmful chemicals. These include organic solvents, acids and heavy metals used in their production and application.
...and that's just the dyeing part - don't get us started on everything else that goes on with what you wear.