from urban discharges, and 67% originate from
industrial discharges Secretar´ıa de Recursos
Hidr´aulicos, 1990.. The industrial water discharges
to the Lerma river come from a wide
range of industrial activity in: food processing;
leather, natural and synthetic textiles; production
and printing of paper; rubber and polymer production;
processing of non-metallic minerals;
wood and metal furniture fabrication; equipment
and machinery ensemble, among others Secret-
ar´ıade de Recursos Hidr´aulicos, 1990..