Javascript not enabled!

Wastewater / Stormwater Collections

What We Do

The Wastewater Collections Section operates and maintains the wastewater collection system and the associated infrastructure. The collection system conveys wastewater from homes and businesses to the wastewater treatment facility. The collection system consists of approximately 641 miles of sanitary lines; including 70 miles of trunk lines (greater than 15”). In addition, there is approximately 12 miles of trunk lines that collect wastewater from the cannery food processors for direct disposal to land.

The Wastewater Collections Section also operates and maintains the City’s storm drainage system. The storm system is designed to prevent flooding in the community, while meeting Federal National Pollutant Discharge Elimination System (NPDES) storm water requirements. The City’s storm drainage system includes two primary types of systems: gravity storm drain systems and rockwells. The gravity system contains 23 storm water lift stations and 23 retention/detention basins. Roughly 2/3 of the City is served by the gravity storm drain system. The rockwell storm drainage system includes some 9,570 rockwells. Rockwells are the primary drainage mechanism for 1/3 of the City.

Sewer System Management Plan

Storm Water Management Plan

Frequently Asked Questions

In an Emergency


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

Contact Us

Wastewater Administration
Primary Plant
1221 Sutter Avenue
Modesto, CA 95351
Directions - Google

Email Us

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