MID  Water Treatment Plant

Modesto Regional Water Treatment Plant

Contact Information

MID Office
1231 11th Street,

Mon-Fri. 8am - 5pm

Contact Information

Irrigation Operations
Mon. - Fri. 7am to 4pm 
(209) 526-7639

Customer Service
Mon. - Fri. 8am to 5pm
(209) 526-7337 or
(888) 335-1643 toll-free

The Modesto Regional Water Treatment Plant is owned and operated by the MID. Completed in late 1994 and expanded in 2016, the plant provides a quality drinking water supply for Modesto area residents.

It now treats and delivers up to 67,000 acre-feet per year to the City of Modesto, supplementing the City’s groundwater supply. MID's arrangement with the City is detailed in the Amended and Restated Treatment and Delivery Agreement.

The water source is the Tuolumne River, which begins high in the Sierra Nevada Mountains. At Modesto Reservoir, water enters the plant’s state-of-the-art treatment process that ensures the water supply meets or surpasses all state and federal drinking water standards now and in the future.

Tours are not available at this time. For more information on the Modesto Regional Water Treatment Plant, send an email to the MID Public Affairs staff.

Domestic Water Policy Committee

The Domestic Water Policy Committee consists of two Modesto City Council members and two MID Board members.  The Policy Committee oversees the management and operation of the Modesto Regional Water Treatment Plant.  The Policy Committee must meet at least twice each year, however, the Committee can and has met more often when significant projects are in process (typically the first Monday of each month).  Meetings take place in the MID Board Room at 1 p.m., unless otherwise noticed.  Agendas are available here.