What We Do
The Wastewater Division is responsible for maintaining the City’s sewer system, collection
of wastewater and storm drain run off, and the treatment process. This division assures
safe discharge of treated water returning to the San Joaquin River. The Wastewater
Division is housed in two locations – a primary treatment facility located on Sutter Avenue
and a secondary treatment and tertiary facility located on Jennings Road. The Wastewater
Division treats an average of 25 million gallons of wastewater per day received from Modesto
residents and businesses.
History
Prior to 1910, the City's wastewater was discharged directly into the Tuolumne River
through a 16" outfall line at the foot of 9th Street. In 1910, the city of Modesto purchased
approximately 28 acres of land at the foot of Franklin Street (which is now known as the
Primary Water Quality Control Treatment Plant), and built a septic tank on the property. A new
line was constructed from the 9th Street outfall line to the septic tank. However, sewage
continued to be discharged directly into the river from this location.
Moving into the 21st century, the equipment at the primary plant has been replaced with more
up-to-date, more efficient equipment. An additional sewage trunk line was installed to handle only
cannery waste during the high harvest season. The waste, which is clean water mixed with bits, pieces
and juices of fruits or vegetables bypasses the treatment process and is pumped directly onto open
fields.
Frequently Asked Questions
In an Emergency
911
Spills reporting 24/7:
(209) 577-6200
Non-Emergency Police Dispatch
(209) 522-2470
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