Environmental Sampling and Analysis Laboratory began in 1978, after state and federal regulations began to require more and more testing at the Corsicana's wastewater plants. In 1985, EPA mandates required the city to develop an approved, Industrial Pretreatment Program. The Environmental Sampling and Analysis Laboratory is responsible for implementation of the Industrial Waste Pretreatment Program and seeing that it is updated as necessary.
The Environmental Sampling and Analysis Laboratory monitors two wastewater treatment plants, three categorical industrial users, nine noncategorical industrial users, 55 minor industrial users, the municipal landfill, and the chlorine residuals on the cities water distribution system. The laboratory data is used to monitor the treatment plants, industries for compliance, and to help determine expansion needs and the technically based local units.