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Ontario, CA
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"reverse osmosis"
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Ontario, CA
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141
"reverse osmosis"
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Ontario, CA
in last 30 days
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Last 30 days
Stormwater Maintenance Crew Leader (Hiring Immediately)
APPLY
GovernmentJobs.com
Pomona, CA
L6 Lead
July 27th, 2026
Water and Wastewater Treatment Plant and System Operators
Water Supply and Irrigation Systems
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Wastewater Treatment Operator Data-Driven & Growth-Oriented
APPLY
Samuel Packaging Systems Group
Fontana, CA
L3 Junior
July 11th, 2026
Water and Wastewater Treatment Plant and System Operators
Sewage Treatment Facilities
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Field Service Engineer, Water Treatment
APPLY
Xylem
Jurupa Valley, CA
L5 Senior
July 22nd, 2026
Water/Wastewater Engineers
Water Supply and Irrigation Systems
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MWD Water Reuse Co-Op Intern - MWD (Hiring Immediately)
APPLY
Cal Poly Pomona Foundation
Pomona, CA
L1 Intern
July 30th, 2026
Water/Wastewater Engineers
Water Supply and Irrigation Systems
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Wastewater Technician
APPLY
People First Employment
Ontario, CA
L3 Junior
July 27th, 2026
Water and Wastewater Treatment Plant and System Operators
Sewage Treatment Facilities
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Internship Trades Program (Hiring Immediately)
APPLY
GovernmentJobs.com
Chino, CA
L1 Intern
July 27th, 2026
Water and Wastewater Treatment Plant and System Operators
Water Supply and Irrigation Systems
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Internship Trades Program
APPLY
GovernmentJobs.com
Chino, CA
L1 Intern
July 13th, 2026
Water and Wastewater Treatment Plant and System Operators
Water Supply and Irrigation Systems
Show all >
Internship Trades Program (Hiring Immediately)
APPLY
Inland Empire Utilities Agency
Chino, CA
L1 Intern
July 27th, 2026
Water and Wastewater Treatment Plant and System Operators
Water Supply and Irrigation Systems
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Field Service Engineer, Water Treatment
APPLY
Xylem
Mira Loma, CA
L5 Senior
July 18th, 2026
Water/Wastewater Engineers
Engineering Services
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WASTEWATER OPERATIONS SUPERINTENDENT - FIELD OPERATIONS (Hiring Immediately)
APPLY
GovernmentJobs.com
Jurupa Valley, CA
L6 Lead
July 27th, 2026
Water and Wastewater Treatment Plant and System Operators
Sewage Treatment Facilities
Show all >
Water Treatment Plant Operator I
APPLY
GovernmentJobs.com
Pomona, CA
L4 Mid
July 18th, 2026
Water and Wastewater Treatment Plant and System Operators
Water Supply and Irrigation Systems
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Senior Engineer
APPLY
Apwa Inland Empire Branch
Chino, CA
L6 Lead
July 16th, 2026
Water/Wastewater Engineers
Water Supply and Irrigation Systems
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Sr. Project Manager, Water Wastewater
APPLY
GFT
Ontario, CA
L7 Manager
August 1st, 2026
Water/Wastewater Engineers
Water Supply and Irrigation Systems
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Utility Worker – Water / Wastewater / Streets
APPLY
City Of Ontario Oregon
Ontario, CA
L3 Junior
July 23rd, 2026
Water and Wastewater Treatment Plant and System Operators
Water and Sewer Line and Related Structures Construction
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SENIOR WASTEWATER PLANT OPERATOR
APPLY
City Of Riverside
Mira Loma, CA
L5 Senior
July 18th, 2026
Water and Wastewater Treatment Plant and System Operators
Sewage Treatment Facilities
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Wastewater Treatment Plant Operator (Grade OIT-V, DOQ)
APPLY
Inland Empire Utilities Agency
Chino Hills, CA
L5 Senior
July 23rd, 2026
Water and Wastewater Treatment Plant and System Operators
Sewage Treatment Facilities
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Wastewater Treatment Plant Operator (Grade OIT-V, DOQ) (Hiring Immediately)
APPLY
GovernmentJobs.com
Chino, CA
L5 Senior
July 27th, 2026
Water and Wastewater Treatment Plant and System Operators
Sewage Treatment Facilities
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SENIOR WASTEWATER PLANT OPERATOR
APPLY
Government
Jurupa Valley, CA
L5 Senior
July 13th, 2026
Water and Wastewater Treatment Plant and System Operators
Sewage Treatment Facilities
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SENIOR WASTEWATER PLANT OPERATOR
APPLY
City Of Riverside
Jurupa Valley, CA
L5 Senior
July 12th, 2026
Water and Wastewater Treatment Plant and System Operators
Sewage Treatment Facilities
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Wastewater Treatment Plant Operator (Grade OIT-V, DOQ) (Hiring Immediately)
APPLY
Inland Empire Utilities Agency
Chino, CA
L5 Senior
July 27th, 2026
Water and Wastewater Treatment Plant and System Operators
Sewage Treatment Facilities
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Senior Engineer - Water & Wastewater Systems Lead
APPLY
Apwa Inland Empire Branch
Chino, CA
L6 Lead
July 16th, 2026
Water/Wastewater Engineers
Administration of Air and Water Resource and Solid Waste Management Programs
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Civil Engineer - Water/Wastewater
APPLY
Michael Baker International
Ontario, CA
L6 Lead
July 14th, 2026
Water/Wastewater Engineers
Engineering Services
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Territory Sales Representative
APPLY
Crh California Water
Ontario, CA
L3 Junior
July 28th, 2026
Sales Representatives of Services, Except Advertising, Insurance, Financial Services, and Travel
Water Supply and Irrigation Systems
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Bottled Water Bottler/Warehouse
APPLY
Masters Coffee Water Service
Ontario, CA
L2 Entry
July 21st, 2026
Stockers and Order Fillers
Bottled Water Manufacturing
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Plant Mechanic - Wastewater
APPLY
City Of Burlington Vt
Ontario, CA
L4 Mid
July 9th, 2026
Water and Wastewater Treatment Plant and System Operators
Sewage Treatment Facilities
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Remote Design Expert - AI Trainer ($50-$80 per hour)
APPLY
Mercor
Montclair, CA
Remote
L3 Junior
July 20th, 2026
Web and Digital Interface Designers
Temporary Help Services
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Service Center Operations Supervisor - 2nd Shift
APPLY
Zurn Elkay Water Solutions
Fontana, CA
L4 Mid
July 27th, 2026
General and Operations Managers
Water Supply and Irrigation Systems
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Utility Associate Civil Engineer
APPLY
GovernmentJobs.com
Pomona, CA
L6 Lead
July 14th, 2026
Civil Engineers
Water and Sewer Line and Related Structures Construction
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Senior Civil Engineer
APPLY
Superbtech
Fontana, CA
L6 Lead
July 14th, 2026
Civil Engineers
Engineering Services
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Deputy General Manager
APPLY
Alliance Resource Consulting
Chino, CA
L7 Manager
July 22nd, 2026
General and Operations Managers
Administration of Air and Water Resource and Solid Waste Management Programs
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Intern (Facilities)
APPLY
Inland Empire Utilities Agency
Chino, CA
L1 Intern
July 8th, 2026
Facilities Managers
Water Supply and Irrigation Systems
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Sr. Associate, Operations Engineering, Systems (WATERDOWN)
APPLY
L3Harris Technologies
Ontario, CA
L6 Lead
July 7th, 2026
Manufacturing Engineers
Water Supply and Irrigation Systems
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Intern (Administration) (Hiring Immediately)
APPLY
GovernmentJobs.com
Chino, CA
L1 Intern
July 30th, 2026
Secretaries and Administrative Assistants, Except Legal, Medical, and Executive
Water Supply and Irrigation Systems
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Electrical & Instrumentation Technician I-III (DOQ)
APPLY
Inland Empire Utilities Agency
Chino Hills, CA
L5 Senior
July 16th, 2026
Electrical and Electronic Engineering Technologists and Technicians
Water Supply and Irrigation Systems
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Intern (Groundwater Recharge)
APPLY
GovernmentJobs.com
Chino, CA
L1 Intern
July 19th, 2026
Hydrologists
Water Supply and Irrigation Systems
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Intermediate, Inventory Control (WATERDOWN)
APPLY
L3Harris Technologies
Montclair, CA
L4 Mid
July 28th, 2026
Shipping, Receiving, and Inventory Clerks
Water Supply and Irrigation Systems
Show all >
Intermediate, Inventory Control (WATERDOWN)
APPLY
L3Harris Technologies
Fontana, CA
L4 Mid
July 28th, 2026
Shipping, Receiving, and Inventory Clerks
Water Supply and Irrigation Systems
Show all >
Temporary Water Distribution Field Technician
APPLY
Santa Ana River Water Company
Jurupa Valley, CA
L3 Junior
July 20th, 2026
Plumbers, Pipefitters, and Steamfitters
Water Supply and Irrigation Systems
Show all >
Intermediate, Inventory Control (WATERDOWN)
APPLY
L3Harris Technologies
Guasti, CA
L4 Mid
July 28th, 2026
Shipping, Receiving, and Inventory Clerks
Water Supply and Irrigation Systems
Show all >
Intermediate, Inventory Control (WATERDOWN)
APPLY
L3Harris Technologies
Mira Loma, CA
L4 Mid
July 28th, 2026
Shipping, Receiving, and Inventory Clerks
Water Supply and Irrigation Systems
Show all >
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