Contact Us

San Joaquin Irrigation District

District Office:
Phone: (209) 249-4600

Physical Address:
11011 E. Highway 120
Manteca, CA 95336

Mailing Address:
P.O. Box 747
Ripon, CA 95366

Water Treatment Plant:
Phone: (209) 844-1500

Physical Address:
5855 Dodds Road
Oakdale, CA 95361

Title Name Direct Line | Cell Phone
General Manager Peter M. Rietkerk (209) 249-4645 | (209) 679-8005
Assistant General Manager Bere Lindley (209) 249-4622 | (209) 679-5442
General Counsel Steve Emrick (209) 249-4613 | (209) 652-4893
Communications Coordinator Troylene Sayler (209) 249-4624 | (209) 652-6681
Executive Secretary Betty Garcia (209) 249-4623 | (209) 487-2377
Information Technology Systems Administrator Michael O'Leary (209) 249-4679 | (209) 679-6161
Human Resources Analyst Don Thornburg (209) 249-4677 | (209) 993-7383
Operations / Water Superintendent Joe Catanzarite (209) 249-4634 | (209) 495-8927
Shop Supervisor Ron Gee (209) 249-4629 | (209) 652-9778
Telemetry Systems Supervisor Frank Avila (209) 249-4663 | (209) 652-5480
Construction / Maintenance Supervisor John Briggs (209) 249-4631 | (209) 652-2857
Assistant Water Superintendent Nick Fereria (209) 249-4628 | (209) 993-9213
Finance Supervisor Robin Giuntoli (209) 249-4610 | (209) 652-2524
Accounting Technician Maria Gikas (209) 249-4676 | (209) 202-4919
Payroll Clerk Rosie Gentry (209) 249-4606
Account Clerk Margo Van Voorst (209) 249-4609
Engineering Department Manager Sam Bologna (209) 249-4617 | (209) 456-1574
Associate Civil Engineer Forrest Killingsworth (209) 249-4620 | (209) 623-8491
Facility Inspector Jerry Donahue (209) 249-4616 | (209) 652-2987
Environmental Compliance/Safety Officer Walt Luihn (209) 249-4627 | (209) 481-2342
Engineering Technician Keith Sausedo (209) 249-4615 | (209) 652-4482
Administrative Secretary Dawn Driesen (209) 249-4619 | (209) 406-9397
Water Conservation Coordinator Julie Vrieling (209) 249-4675 | (209) 679-3835
24-Hour Emergency (209) 249-4632
Division / Title Name Mobile Number
Division #1 Joe Hasten (Days)
Zack Gorgas (Nights)
(209) 652-9793
Division #2 Andrew McDonald (Days)
Bob Anderson (Nights)
(209) 652-9784
Division #3 Keith Obrochta (Days)
Randy Sprinkle (Nights)
(209) 652-9775
Division #1-3 Relief Anthony Podesto (Days)
Charlie Couto (Nights)
Division #4 Collin Hodge (Days)
Rob Shipman (Nights)
(209) 652-7025
Division #5 Joe Lourenco (Days)
Jason Wirstlin (Nights)
(209) 652-3427
Division #6 Michael Donahue (Days)
Mark Schneringer (Nights)
(209) 652-2409
Division #4-6 Relief Jeff Hammond (Days)
John Van Nieuwenhuyzen (Nights)