Sample and test the water
Collect water, wastewater or sludge samples for physical or chemical tests that show how well treatment works.
Career profile
Water/Wastewater Treatment Operator
Water treatment operators make raw water drinkable and clean wastewater before its release or reuse.
One shift can take you from testing a sample to adjusting a pump, checking an alarm and writing up results that regulators review.
A day in the life
Adjust pumps, valves and dosing
You run pumps, valves, chemical feeders and controls to keep flow and treatment conditions within target ranges.
Follow up on odd readings
Watch meters, gauges, alarms and screens, then follow up on readings hinting at failing equipment or changing load.
Keep equipment ready to use
Inspect, clean, grease and make routine fixes to tanks, filter beds, treatment gear and safety equipment.
Log readings and test results
Record readings, upkeep and test results, including wastewater discharge details required in compliance records for regulators.
Quick facts
High school + long-term training
United States · Current BLS profile accessed 2026-09-18
$60,020 median
United States · May 2025
-6% projected
United States · 2025-2035
Quick orientation
Preparation, pay & outlook
Preparation
High school + long-term trainingA diploma or equivalent is typical, followed by long-term training under an experienced operator. Employers or local rules may require more.
Pay
$60,020 medianNational median annual wage for this occupation in May 2025; it is not a starting-pay figure.
Outlook
-6% projectedEmployment is projected to decline from 2025 to 2035, with about 10,000 openings a year expected from replacement needs.
Fit, tradeoffs & changing tools
You might like this if…
- You like finding meaning in readings, samples, and visible changes in equipment.
- You can follow a procedure closely without tuning out.
- You want a mix of control-room, laboratory, and hands-on mechanical work.
- You stay steady when an alarm or unexpected test result requires investigation.
Things to weigh
- Round-the-clock plants may schedule nights, weekends, rotating shifts, or emergency call-ins.
- Expect some physical work around noise, odors, contaminants, slippery areas, machinery, and difficult-to-access equipment; protective gear and safety procedures matter.
- Accurate readings and records carry real weight because treatment results, coworkers, and regulatory compliance can depend on them.
Where AI may help
Computerized control screens, sensors, alarms, and automatic logs can show plant conditions and organize operating records.
What people still lead
Operators still verify samples, interpret unusual readings, choose adjustments, troubleshoot equipment, and take manual control during malfunctions.
What we can’t predict yet
Automation may reduce staffing, but its pace and effect will vary by facility and task; monitoring may change without removing the need for field checks, maintenance, and response work.
Pay in context
Earnings
National figures give you a benchmark, but a local offer can differ with the employer, location, schedule, experience, and responsibility.
National midpoint
The median annual wage was $60,020, meaning half of workers in the occupation earned more and half earned less. The median hourly wage was $28.86.
Observed wage spread
The lowest-paid 10 percent earned less than $39,110, while the highest-paid 10 percent earned more than $91,060. These thresholds are not entry and senior career stages.
What can move the number
BLS notes that wages within an occupation vary with experience, responsibility, performance, tenure, and geography. The national data do not establish a pay premium for any particular license or program.
Getting started
Enter as a trainee
Long-term on-the-job trainingPaid
- What the route involves
- Work under an experienced operator while recording readings, taking samples, following safety procedures, and performing simple maintenance.
- What it can lead to
- Build the operating experience and plant familiarity needed to become fully qualified and, where allowed, complete licensing requirements while employed.
- What to check
- License class, exams, qualifying experience, and trainee authority vary by jurisdiction and may differ between drinking-water and wastewater work.
Study a related field first
Certificate, associate degree, or bachelor's degree, depending on the program
- What the route involves
- Complete related coursework such as environmental science or wastewater treatment technology before applying.
- What it can lead to
- Meet a preparation preference used by some employers and arrive with more background for plant training.
- What to check
- A school credential does not guarantee a job or replace the license, examination, and experience rules that apply in a particular jurisdiction.
A common route is supervised employment, but related education can strengthen an application. Neither route creates one nationwide license sequence.
After entry
Career paths
This starts where the entry routes leave off: early work, growing capability, and advancement or specialization.
Get established
Complete supervised plant training and the education, experience, and examination steps required for your assigned duties and jurisdiction.
Handle more of the process
Learn the facility's treatment stages, safety systems, controls, sampling routines, and manual procedures before working with less supervision.
Advance or specialize
Higher license levels may permit more complicated work without supervision; at large plants, highly licensed operators may move into shift supervision.
- Build deeper capability in mechanical maintenance, process controls, or laboratory testing as the facility's work allows.
Where you can work
Drinking-water plants and systems
Work can move among indoor control areas, a laboratory, and outdoor treatment or distribution equipment. Because these systems operate continuously, some assignments include night, weekend, or on-call coverage.
- Indoors
- Outdoors
- Lab
- Shift work
- On call
- Safety-sensitive
Wastewater plants and systems
Control rooms and laboratories sit alongside outdoor tanks and treatment equipment. Odors, contaminants, slippery areas, and protective gear can be a more visible part of this setting.
- Indoors
- Outdoors
- Lab
- Shift work
- Physical demands
- Safety-sensitive
Small and large facilities
A small facility may give one operator broad responsibility across the system. A large plant is more likely to divide work among a shift team and specialized assignments.
- Indoors
- Outdoors
- Shift work
- On call
Try it
See whether the job clicks before you commit to the path.
Open a public drinking-water or wastewater process diagram. Trace one drop through the system, choose three points where an operator might read a gauge or take a sample, and make a one-page shift log showing what you would record and what change would make you investigate. Then ask whether following the process and interpreting its readings held your interest.
Stay safe: Use public diagrams or virtual materials only.
Sources
- U.S. Bureau of Labor Statistics. Water and Wastewater Treatment Plant and System Operators. Accessed 2026-09-18.
- O*NET OnLine. 51-8031.00 - Water and Wastewater Treatment Plant and System Operators. Accessed 2026-09-18.
- U.S. Environmental Protection Agency. Operator Certification Program Management. Accessed 2026-09-18.
- U.S. Environmental Protection Agency. About NPDES. Accessed 2026-09-18.