In the Lab

toddler drinking from fountain

Tucson Water's Environmental and Regulatory Compliance Section (ERCS) oversees the Drinking Water Regulatory Program. Its core responsibilities include identifying applicable drinking water regulations and sharing them with the department and the Water Quality Laboratory for monitoring and reporting, and ensuring compliance with drinking water standards.

Learn more at the links below or:

Contaminants of Emerging Concern

Tucson Water’s “Sentry Program,” a proactive, voluntary monitoring component of its water quality management program.

Maximum Contaminant Levels

A list of specific regulated drinking water MCLs or Alert Levels.


About 1,4-dioxane, a stabilizer in industrial solvents in aircraft manufacturing facilities from the 1940s-1970s.

Lead and Copper

Information on Tucson Water’s lead and copper monitoring program.

Microbiological Testing

Monitoring for bacteria and other microorganisms and what happens if they are found.

About the Water Quality Laboratory

Highly-skilled professionals with backgrounds in chemistry, microbiology, engineering, computers, and management.