Water and Wastewater Treatment Plant Operator Salary Guide 2025: $60,020 Median, But Outlook Shrinks
The median Water and Wastewater Treatment Plant and System Operator earns $60,020 per year, according to the latest Bureau of Labor Statistics data. That works out to about $29 an hour, with the typical range spanning from $39,110 at the 10th percentile to $91,060 at the 90th. But the profession is facing headwinds: employment is projected to shrink 6.5% from 2024 to 2034, even though about 10,700 openings open up each year due to retirements and turnover.
How much Water and Wastewater Treatment Plant and System Operators earn
The BLS reports a national mean salary of $62,540 and a median of $60,020. Half of all operators earn between roughly $39,000 and $91,000. The top 10% pull in more than $91,000, while the bottom 10% earn under $39,110.
Pay varies by industry. Operators in local government (the largest employer) earn a mean of $61,790. Those in federal executive branch work make about $78,840. The highest-paid operators often work at large industrial facilities.
Pay by state
California leads with an average annual wage of $81,770, followed closely by Nevada ($81,440), Washington ($80,800), Connecticut ($78,820), and New Jersey ($78,760). On the lower end, Arkansas averages $44,320, Kentucky $45,430, and Oklahoma $45,890. Regional cost of living partly explains the gaps — a Nevada or Washington operator earns nearly double the Arkansas median.
How to become Water and Wastewater Treatment Plant and System Operator
Most states require a license to operate a treatment plant. The path starts with a high school diploma or GED. Many operators enter through on-the-job training or a 1-to-2-year certificate program at a community college. Coursework typically covers water chemistry, microbiology, and system hydraulics.
The real qualification is a state-issued operator certificate, which usually requires passing an exam and accumulating documented experience — often 1 to 3 years for the lowest grade. Many employers prefer candidates with a Class B or higher license. Some operators start as utility workers and work up.
- Get a high school diploma or equivalent.
- Complete a certificate or associate's program in water/wastewater technology (optional but helpful).
- Gain entry-level experience, often as a trainee or in a related utility role.
- Pass your state's operator licensing exam; start with the lowest grade and upgrade over time.
- Renew your license with continuing education credits (typically every 1–3 years).
Job outlook
The BLS projects a 6.5% decline in employment from 2024 to 2034, which is much worse than the average for all occupations. Automation and improved treatment technology are reducing the need for manual monitoring. Still, about 10,700 job openings per year are expected, mostly to replace workers who retire or leave the field. Local government budgets also influence hiring.
Frequently asked questions
What is the salary of a Water and Wastewater Treatment Plant and System Operator in 2025?
The median annual salary is $60,020, with most operators earning between $39,110 and $91,060, according to the latest BLS data.
How do I become a Water and Wastewater Treatment Plant Operator?
You typically need a high school diploma and a state-issued operator license. Many start with a certificate or associate's degree in water treatment technology, then gain on-the-job experience and pass a licensing exam.
Is the job outlook for water treatment operators good?
The BLS forecasts a 6.5% decline in employment through 2034, but about 10,700 openings per year are expected due to retirements. Automation is reducing demand, but replacement needs remain steady.
Salary figures are U.S. Bureau of Labor Statistics estimates (OEWS / Employment Projections). For informational purposes only; not career or financial advice. See the full Water and Wastewater Treatment Plant and System Operators data.