The most affected states are Guanajuato, Querétaro and Veracruz, and the majority of cases (55 percent) is due to the improper disposal of waste; 13 percent to mining activities; 11 industrial work, and 3.4 percent to oil and its derivatives, reported last year the sector program dependence. 
He said that until last year, 1.5 percent of the sites were 'remediated' and 3.4 percent were in process. There are old cases of contamination, such as former industrial unit Fertimex, Salamanca, which is in the process of 'remediation', and field baseball field in Villa de la Paz, San Luis Potosi, according to the second report of work of the unit, for this year. 
At the end of 2013, the Information System Contaminated Sites updated the record by identifying 635 potentially contaminated sites. Between January and June this year began recording 379 sites considered 'liabilities and environmental emergencies proposals approved remediation' indicates SEMARNAT in the work report of the first half of the year.
He explained that 70 'proposed remediation of soils contaminated by environmental emergencies' on an area of ​​60 thousand 799 square meters and a volume of 81 thousand cubic meters were met. Also attended 37 'soil remediation proposals' on sites considered 'environmental liability' in an area of ​​4 million 465 thousand square meters. 
Sanctions Ssa in Sonora 
Moreover, in Queretaro, the head of the Secretariat of Health (SSA), Mercedes Juan Lopez, released an opinion that already exists for the enforcement of penalties for the damages generated in the copper sulfate spill in the Sonora river . 
He said that the Federal Commission for Protection against Health Risks (Cofepris) held the opinion to apply penalties for the spill in the Sonora River. He said seven people had dermatitis and gastrointestinal problems by drinking water contaminated with copper sulfate and decided to close 40 pits.