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
- My toilet is backed up, do I call a plumber or the City of Modesto?
- Call the City of Modesto at (209) 577-6200. The Wastewater Division has a "Call Us First" policy, which helps the City and the property owner determine if a sewer blockage problem is within the City's mainline. A City crew will determine if the problem is within the City maintained line or within your privately maintained line. If the City's mainline is not plugged, you may need a plumber.
In an Emergency
24- hour emergency line
Non-Emergency Police Dispatch