The Laboratory Section collects and analyzes a wide variety of samples, including water, wastewater, industrial wastewater, and biosolids. Sampling and analysis are performed to support the City’s water and wastewater facilities and ensure compliance with environmental regulations.

Laboratory staff conduct monitoring required under federal and state programs including the Safe Drinking Water Act (SDWA), Clean Water Act, Arizona Pollution Discharge Elimination System (AZPDES), 40 CFR Part 503 Biosolids Rule, Aquifer Protection Permits (APP) and the City's Pretreatment Program. 

Microbiological testing is performed for the City’s drinking water treatment plants and distribution system, with results reported to the Arizona Department of Environmental Quality (ADEQ) and the Environmental Protection Agency (EPA).

In addition to regulatory monitoring, the laboratory section also serves as the primary point of contact for customer concerns related to water safety and quality. Most inquiries or complaints are addressed within the same business day.

Water Quality Information

The City of Yuma’s potable water system, Public Water System No. 14024, is regulated under the SDWA and overseen by ADEQ and the EPA.

For laboratory reports and technical monitoring summaries, visit the Lab Reports page. 

The City also published an annual Consumer Confidence Report (CCR) or Water Quality Report that summarizes drinking water quality and monitoring results for the previous calendar year. 

For More Information

If you have any questions or concerns regarding the quality of your drinking water, please contact the Laboratory Section at (928) 373-4597.