What it pays
Government survey numbers — not estimates, not ads.
Half of all Water and Wastewater Treatment Plant and System Operators in the U.S. earn more than $60,020 a year — the middle 80% land between $39,110 and $91,060. About 128,490 people in the U.S. do this work. Figures are for the U.S. occupation group “Water and Wastewater Treatment Plant and System Operators”. (U.S. Bureau of Labor Statistics survey, published 2025.) In India, Plant and machine operators and assemblers earn about ₹17,329 a month on average — around ₹2.1 lakh a year (government PLFS survey via ILOSTAT, occupation-family figure).
$60,020typical pay / year
128,490people in this work
$91,060+top 10% earn
₹2.1 lakha year in India (family avg)
Think you get this job?Six quick questions on how it really works — with a hint and the reason behind every answer.
Test yourself →The work, task by task
These are the real jobs-to-be-done, not a wish list. Each task shows where we found it, and the prompt underneath is written for that exact task.
Keeping the record2
Record meter and gauge readings
+Record the influent and effluent meter totals, chlorine residual, pH and turbidity gauge readings at 07:00…
Record meter and gauge readings
+Record the influent and effluent meter totals, chlorine residual, pH and turbidity gauge readings at 07:00 and 15:00 on Tuesday, note any trends or outliers, attach the hand-written field sheet photo, and submit the entry before shift end.
The tools that do the workData loggingjob descriptionsO*NETWikipedia
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Take samples of the water
+Collect grab samples from influent, aeration basin, effluent and return activated sludge at 10:30, label…
Take samples of the water
+Collect grab samples from influent, aeration basin, effluent and return activated sludge at 10:30, label bottles with location and time, run on-site BOD and ammonia tests, and send remaining cooled samples to the lab with chain-of-custody form.
The tools that do the workMaterial safety data sheet MSDSESCOjob descriptionsO*NETWikipedia
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Fixing2
Inspect equipment regularly
+Walk the primary clarifier, pumps and chemical feed rooms at 09:30 Wednesday, inspect seals, belts and…
Inspect equipment regularly
+Walk the primary clarifier, pumps and chemical feed rooms at 09:30 Wednesday, inspect seals, belts and bearings, log condition and required repairs, photograph any corrosion or leaks, and send a maintenance request to supervision if any item is rated Poor.
The tools that do the workHuman machine interface HMIRecords managementjob descriptionsO*NETWikipedia
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Operate or control machinery and systems
+Run the secondary aeration blowers and adjust dissolved oxygen setpoints to 2.5–3.0 mg/L during the 06:00…
Operate or control machinery and systems
+Run the secondary aeration blowers and adjust dissolved oxygen setpoints to 2.5–3.0 mg/L during the 06:00 shift, monitor pump amps and bearing temps, record actions and why, and hand over updated operating notes to the night technician.
The tools that do the workSupervisory control and data acquisition SCADAHuman machine interface HMIjob descriptionsO*NETWikipedia
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Analysing1
Calibrate sensors and control systems
+Calibrate the dissolved oxygen probe and pH transmitter at 08:00 Thursday using fresh standards, record…
Calibrate sensors and control systems
+Calibrate the dissolved oxygen probe and pH transmitter at 08:00 Thursday using fresh standards, record calibration slope and offset, replace any sensor showing drift over 10%, and file the calibration report in the asset record.
The tools that do the workOperational Data Store ODSjob descriptionsWikipedia
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Protecting1
Respond to system alarms and emergencies
+Respond to the high-level alarm in the return pump station now, isolate the affected pump, verify wetwell…
Respond to system alarms and emergencies
+Respond to the high-level alarm in the return pump station now, isolate the affected pump, verify wetwell level and float switch function, log actions taken and call the on-call supervisor if overflow risk remains.
The tools that do the workHuman machine interface HMISupervisory control and data acquisition SCADAjob descriptionsWikipedia
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The daily work16
Report test results to regulatory agencies
+Send the validated daily lab report for Plant 4 containing pH, turbidity, BOD, TSS and chlorine residual to…
Report test results to regulatory agencies
+Send the validated daily lab report for Plant 4 containing pH, turbidity, BOD, TSS and chlorine residual to the state regulator's compliance mailbox and the city environmental officer, attach chain-of-custody, and confirm receipt by 5pm today.
The tools that do the workRecords managementOperational Data Store ODSjob descriptionsWikipedia
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Add chemicals such as chlorine or ammonia
+Dose chlorine and ammonia at the north contact basin to bring free chlorine to 1.5 mg/L and ammonia to target…
Add chemicals such as chlorine or ammonia
+Dose chlorine and ammonia at the north contact basin to bring free chlorine to 1.5 mg/L and ammonia to target 0.3 mg/L, record batch volumes and pump runtimes in the chemical log, and monitor residuals at 30 and 60 minutes.
The tools that do the workSupervisory control and data acquisition SCADAData loggingjob descriptionsWikipedia
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Direct and coordinate plant workers engaged in routine operations and maintenance activities.
+Organise crews for morning shift: assign two operators to filter backwash, one to labs for sample runs, and…
Direct and coordinate plant workers engaged in routine operations and maintenance activities.
+Organise crews for morning shift: assign two operators to filter backwash, one to labs for sample runs, and two to equipment rounds, circulate the shift checklist, note critical tasks for the maintenance crew, and brief everyone at 07:15 on priorities and safety hazards.
The tools that do the workMicrosoft OfficeO*NET
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Direct lower level operators
+Give clear instructions to the junior operators: run grab samples at influent and effluent every hour, log…
Direct lower level operators
+Give clear instructions to the junior operators: run grab samples at influent and effluent every hour, log readings on the board, escalate any chlorine or pH excursions to me immediately, and shadow each for their first two rounds today.
The tools that do the workMicrosoft Officejob descriptions
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Troubleshoot equipment malfunctions
+Isolate and troubleshoot the mixed liquors return pump fault: follow lockout tagout, inspect seals and…
Troubleshoot equipment malfunctions
+Isolate and troubleshoot the mixed liquors return pump fault: follow lockout tagout, inspect seals and couplings, check motor starter and VFD alarms, swap to the standby pump if failure persists, and log all findings and corrective actions in the maintenance record.
The tools that do the workHuman machine interface HMIRecords managementWikipedia
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Manage chemical inventories and storage
+Inventory chemical storeroom, count drums of chlorine, ammonia, polymer and caustic, note bottle lot numbers…
Manage chemical inventories and storage
+Inventory chemical storeroom, count drums of chlorine, ammonia, polymer and caustic, note bottle lot numbers and expiry dates, reconcile against the reorder threshold, secure any damaged containers, and update the chemical ledger for procurement to review tomorrow.
The tools that do the workMaterial safety data sheet MSDSMicrosoft ExcelWikipedia
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Assist in start-up and shut-down procedures
+Run the plant start-up checklist for the east clarifier train, ramp polymer feed to 150 mL/min, confirm…
Assist in start-up and shut-down procedures
+Run the plant start-up checklist for the east clarifier train, ramp polymer feed to 150 mL/min, confirm blower VFDs reach operating RPM, log pH and dissolved oxygen on the startup sheet, and notify Operations Lead Mark within 20 minutes if any setpoint fails.
The tools that do the workHuman machine interface HMIData loggingWikipedia
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Perform laboratory tests
+Run the lab battery for the 0800 shift: perform BOD and TSS on the influent and effluent samples, run…
Perform laboratory tests
+Run the lab battery for the 0800 shift: perform BOD and TSS on the influent and effluent samples, run chlorine residual and pH, record results on the daily lab log, and flag any BOD over 30 mg/L to Senior Chemist Ana for repeat analysis.
The tools that do the workMaterial safety data sheet MSDSRecords managementESCO
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Develop purification procedures
+Draft a step-by-step alum dosing SOP to reduce seasonal turbidity: include target dose ranges per NTU, jar…
Develop purification procedures
+Draft a step-by-step alum dosing SOP to reduce seasonal turbidity: include target dose ranges per NTU, jar test protocol, safety PPE, sample points, and an approval line for Plant Manager Carlos, ready for review by Friday.
The tools that do the workMicrosoft WordMicrosoft ExcelESCO
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Chemical processes
+Run the caustic and polymer mixing checks for the midday batch: verify feed concentrations, confirm mixer RPM…
Chemical processes
+Run the caustic and polymer mixing checks for the midday batch: verify feed concentrations, confirm mixer RPM and tank level alarms, sample the mixed solution for titration to target, and log any deviations to Maintenance Supervisor Luis.
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Measure water quality parameters
+Walk the final effluent sampling route and take grab samples at Outfall A, the secondary clarifier overflow,…
Measure water quality parameters
+Walk the final effluent sampling route and take grab samples at Outfall A, the secondary clarifier overflow, and the UV channel, measure temperature, pH, conductivity and turbidity on site, record values in the daily field sheet and alert Compliance if turbidity exceeds 1.0 NTU.
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Water chemistry analysis
+Run the ion balance and alkalinity titrations on the composite sample from shift B, calculate hardness and…
Water chemistry analysis
+Run the ion balance and alkalinity titrations on the composite sample from shift B, calculate hardness and free ammonia, compare results to last week's baseline, and send the summarized chemistry table to Process Engineer Jenna by end of day.
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Develop water purification methods
+Design and document a bench-scale treatment sequence for the north plant using available coagulants and…
Develop water purification methods
+Design and document a bench-scale treatment sequence for the north plant using available coagulants and activated carbon, run three jar tests with river feed, record turbidity, pH, and residuals, then recommend the two best protocols with estimated chemical doses and cost per cubic metre by Friday.
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Test chemical samples
+Collect and label grab samples from influent, effluent, and clarifier return this morning, run standard…
Test chemical samples
+Collect and label grab samples from influent, effluent, and clarifier return this morning, run standard titrations and spectrophotometer tests for ammonia, nitrate, chlorine, and COD, log results with time and analyst initials, flag any out-of-spec values and attach copies of raw instrument printouts.
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Operational data store
+Log today's pump runtimes, influent and effluent turbidity, chlorine residuals, and any alarms into the…
Operational data store
+Log today's pump runtimes, influent and effluent turbidity, chlorine residuals, and any alarms into the operational data store, flagging the midnight shift's low flow event and attaching the hourly grab sample notes for supervisor review.
The tools that do the workOperational Data Store ODSO*NET
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Human machine interface
+Record the pump runtime, inlet turbidity, and today's chlorine residual readings into the wastewater human…
Human machine interface
+Record the pump runtime, inlet turbidity, and today's chlorine residual readings into the wastewater human machine interface log, note the sensor recalibration at 14:10 and technician Sara Lopez's signature, then mark for supervisor review.
The tools that do the workSupervisory control and data acquisition SCADAO*NET
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Built on public evidence: O*NET®, ESCO, Wikipedia, U.S. Bureau of Labor Statistics, ILOSTAT. All sources & licenses
Built on public evidence: O*NET®, ESCO, Wikipedia, U.S. Bureau of Labor Statistics, ILOSTAT. All sources & licenses