Laboratory & Environmental Services

What We Do

The Laboratory and Environmental Services section of the Wastewater Division is responsible for ensuring the compliance of state and federal laws. Inspections of permitted facilities and samples are periodically collected to ensure compliance with the City’s wastewater discharge permits and storm water permits and to protect Dry Creek and the Tuolumne River, which discharge into the San Joaquin River. Laboratory Services provides analytical data for the monthly plant report, annual storm water report, and quarterly pre-treatment report that directly support compliance with the City’s wastewater and storm water permits. In addition, the laboratory also supports the Water Division of Public Works by providing nitrate and nitrite analysis and microbiology testing to ensure compliance with drinking water regulatory requirements.

Frequently Asked Questions

Other Links

Kids Corner

In an Emergency


24- hour emergency line
(209) 577-6200
Non-Emergency Police Dispatch
(209) 522-2470

Section Manager

Tom Sinclair, Environmental Regulatory Compliance Manager
Tom Sinclair
Environmental Regulatory Compliance Manager

Contact Us

Wastewater Administration
Primary Plant
1221 Sutter Avenue
Modesto, CA 95351
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Email Us

(209) 577-6200 phone
(209) 577-6345 fax