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Water and Wastewater Treatment Plant and System Operators

Water and wastewater treatment plant and system operators manage a system of machines to transfer or treat water or wastewater.

12/100
#624 of 825
$60,020
median pay, U.S.
128,490
employed (2024)
-6.5%
growth, 2024–34
10,700
openings per year
High school diploma or equivalent
typical entry education

Is water and wastewater treatment plant and system operators a good career?

It scores 12/100 and ranks #624 of 825 occupations on pay, growth, employment and openings. Here's what the federal data says, with no editorializing.

Advantages

  • No college degree typically required to enter

Possible tradeoffs

  • Employment is projected to decline (-6.5% through 2034)

What water and wastewater treatment plant and system operators earn

Wages: BLS OEWS May 2025

Pay is a range, not a number. Half of U.S. water and wastewater treatment plant and system operators earn between $48,040 and $74,780 a year.

Best-paying states

California statewide
$81,770
Nevada statewide
$81,440
Washington statewide
$80,800
Connecticut statewide
$78,820
New Jersey statewide
$78,760
Minnesota statewide
$74,670
Colorado statewide
$74,200
Oregon statewide
$69,720
Massachusetts statewide
$68,550
Illinois statewide
$67,810
$40k $90k $140k

Best-paying metros

01 San Francisco, CA $125,160
02 San Jose, CA $108,190
03 Vallejo, CA $106,150
04 Napa, CA $101,540
05 Fairbanks, AK $99,840
06 Seattle, WA $99,010
07 Santa Cruz, CA $94,060
08 Olympia, WA $88,270

Strongest employment concentration

01 California 11,630
02 Texas 10,520
03 Florida 7,440
04 Ohio 5,870
05 New York 5,300
06 Pennsylvania 4,660

Live water and wastewater treatment plant and system operators jobs

No live water and wastewater treatment plant and system operators openings yet

When the jobs.best ATS feed launches, verified water and wastewater treatment plant and system operators openings will appear here — each shown against the $60,020 national median. Nothing here is placeholder.

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How to become a water and wastewater treatment plant and system operator

Typical education
High school diploma or equivalent
Work experience
None
On-the-job training
Long-term on-the-job training
Outlook
Employment is projected to grow decline through 2034.

Education

Water and wastewater treatment plant and system operators typically need a high school diploma or equivalent to enter the occupation. High school students may benefit from taking classes in subjects such as biology, chemistry, and math.

Employers may prefer applicants who have completed a certificate, an associate’s, or a bachelor’s degree program in a related field such as environmental science or wastewater treatment technology.

Training

Water and wastewater treatment plant and system operators need long-term on-the-job training to become fully qualified. Trainees learn their skills on the job under the direction of an experienced operator. The trainees learn by observing and doing routine tasks, such as recording meter readings, taking samples of wastewater and sludge, and performing simple maintenance and repair work on plant equipment. They also learn about industrial safety and how to use personal protective equipment.

Some water and wastewater treatment plants combine on-the-job training with formal classroom or self-paced study programs. As plants get more complicated, operators need more skills before they are allowed to work without supervision.

Licenses, certifications & registrations

Water and wastewater treatment plant and system operators typically require a state license; however, entry-level workers often complete their licensing requirements during on-the-job training. Requirements and standards vary widely depending on the state. State licenses typically have multiple levels, which indicate the operator’s experience and training. Although some states will honor licenses from other states, operators who move from one state to another may need to take a new set of exams to become licensed in their new state.

Some workers choose to earn professional certification, which may help to demonstrate competency in the field.

Advancement

Most states have multiple levels of licenses for water and wastewater treatment plant and system operators. Each increase in license level allows the operator to perform more complicated processes without supervision.

At the largest plants, operators who have the highest license level work as shift supervisors and may oversee large teams of operators.

Important qualities

Critical and analytical thinking skills. Water and wastewater treatment plant and system operators must conduct tests and inspections on water or wastewater and evaluate the results.

Computer skills. Water and wastewater treatment plant and system operators often need to use computerized systems to help monitor plant processes.

Detail oriented. Water and wastewater treatment plant and system operators must monitor machinery, gauges, dials, and controls to ensure everything is operating properly. Because tap water and wastewater are highly regulated, operators must be careful and thorough in completing these tasks.

Math skills. Water and wastewater treatment plant and system operators must have the ability to apply data to formulas that determine treatment requirements, flow levels, and concentration levels.

Mechanical skills. Water and wastewater treatment plant and system operators must know how to work with machines and use tools. They must be familiar with how to operate, repair, and maintain equipment.

Problem-solving skills. Water and wastewater treatment plant and system operators must find and troubleshoot problems that arise with equipment or controls.

Related occupations

High school diploma or equivalent · $96,710 median
High school diploma or equivalent · $102,040 median
High school diploma or equivalent · $78,620 median
Questions about becoming a water and wastewater treatment plant and system operator
How much do water and wastewater treatment plant and system operators make?

The national median wage is $60,020 a year, with the middle half earning between $48,040 and $74,780 (BLS OEWS May 2025).

Is water and wastewater treatment plant and system operators a good career?

On the Jobs.best index it scores 12 of 100 and ranks #624 of 825 occupations, weighing pay, growth, employment and openings. Employment is projected to change -6.5% through 2034.

What education do you need to become a water and wastewater treatment plant and system operator?

The typical entry-level education is high school diploma or equivalent.

Where do water and wastewater treatment plant and system operators earn the most?

Among states, California pays the highest median ($81,770). Local pay for every state and metro is below.

U.S. Bureau of Labor StatisticsWages: BLS OEWS May 2025 · Projections: BLS EP 2024–34
Sources: OEWS-M2025 · EP-2024-34 · OOH-2024-34. How we score careers →