What New Wastewater Operators Get Wrong (And What I Wish I Knew Earlier)
When I first got into wastewater, I thought success would come from learning formulas, passing exams, and memorizing treatment processes.
Those things matter.
But looking back, most of the mistakes I made had nothing to do with math or biology.
They came from misunderstanding what it actually takes to become a good operator.
If you’re new to the industry, here are some of the biggest things I see new operators get wrong—and what I wish I knew from day one. A lot of these lessons overlap with the realities covered in Things Nobody Tells You About Working Wastewater.
Thinking the License Is the Finish Line
A lot of new operators treat certification like the ultimate goal.
They study hard, pass the exam, and then relax.
The reality is that passing the test is just the beginning. If you are still preparing, here is how to pass the wastewater operator exam first try.
The exam teaches fundamentals.
The plant teaches operations.
Some of the best operators I’ve worked with weren’t necessarily the best test-takers. They were the people who kept learning long after they got their license.
The operators who advance the fastest are usually the ones who stay curious.
Being Afraid to Ask Questions
I understand the feeling.
Nobody wants to look inexperienced.
But every experienced operator knows something important:
The dangerous operator isn’t the one asking questions.
The dangerous operator is the one pretending they already know everything.
When I started asking more questions, I learned faster and made fewer mistakes.
Most veteran operators are willing to teach if they see you’re genuinely trying to learn.
Focusing Only on “Their Area”
Many new operators become comfortable with one part of the plant.
Maybe they know aeration well.
Maybe they know the lab.
Maybe they know solids handling.
The problem is that promotions usually go to operators who understand the entire process.
The more areas you learn, the more valuable you become.
Don’t just learn your job.
Learn the plant.
Ignoring the Maintenance Side
A common mistake is thinking wastewater is only about process control.
In reality, many operators spend a huge amount of time dealing with equipment.
Pumps fail.
Valves stick.
Blowers trip.
Sensors foul.
The operators who understand basic maintenance become much more effective at troubleshooting.
You don’t need to become a mechanic, but learning how equipment works will make you a better operator.
Chasing Numbers Instead of Understanding Trends
New operators often obsess over individual lab results.
One high ammonia result.
One strange MLSS reading.
One unusual pH value.
Experienced operators tend to look at trends.
A single number doesn’t always tell the story.
What matters is where the process has been going over the last several days or weeks. For example, learning how to read MLSS and MLVSS results makes trend-based thinking much easier.
Learning to recognize trends is one of the biggest steps toward becoming a confident operator.
Thinking Experience Comes From Time Alone
I’ve seen operators with twenty years in the industry who stopped learning after year two.
I’ve also seen operators with three years of experience who became incredibly knowledgeable because they actively pursued growth.
Time helps.
But experience comes from:
- asking questions
- solving problems
- studying
- learning from mistakes
Growth isn’t automatic.
Complaining Instead of Learning
Every plant has challenges.
Equipment breaks.
Schedules change.
Management makes decisions you don’t agree with.
The operators who move up aren’t usually the ones who complain the loudest.
They’re the ones who become part of the solution.
Supervisors notice operators who solve problems.
They also notice operators who constantly create them.
Waiting for Someone to Teach You Everything
One lesson I learned early is that nobody cares about your career as much as you do.
Good mentors help.
Good supervisors help.
But ultimately, your growth is your responsibility.
Read manuals.
Study systems.
Ask questions.
Take tours of other facilities.
Volunteer for projects.
The operators who take ownership of their development usually advance the fastest.
Underestimating the Importance of Communication
Many people think wastewater is a job where you work alone and don’t need people skills.
That’s not true.
Good operators communicate with:
- coworkers
- supervisors
- lab staff
- maintenance teams
- regulators
- contractors
The ability to explain problems clearly and professionally can open doors throughout your career.
Thinking Promotions Are Based Only on Knowledge
Knowledge matters.
But promotions often go to operators who demonstrate:
- reliability
- professionalism
- leadership
- initiative
Plants want people they can trust.
Every shift is an opportunity to build that reputation.
The Biggest Thing I Wish I Knew
The operators who succeed aren’t usually the smartest people in the room.
They’re the people who stay teachable.
They ask questions.
They keep learning.
They remain humble enough to admit when they don’t know something.
Wastewater is a career where you’ll never know everything.
And that’s actually one of the things I enjoy most about it.
Every day there’s something new to learn.
Final Thought
If you’re a new operator, don’t worry about being perfect.
Focus on becoming a little better every shift.
Learn the process.
Learn the equipment.
Learn from the experienced operators around you.
Do that consistently, and you’ll be surprised how far your career can go.
The goal isn’t to know everything.
The goal is to never stop learning.