Water and wastewater treatment is one of the most essential — and most overlooked — sectors in industrial automation. Every community depends on treatment plants that operate 24/7/365 to deliver safe drinking water and process wastewater before returning it to the environment. These facilities run on SCADA systems, PLCs, instrumentation networks, and increasingly sophisticated data analytics platforms. The automation professionals who keep these systems running protect public health in a way that is both critical and underappreciated.
The water and wastewater sector is also facing a workforce crisis that creates exceptional opportunities for automation professionals. The American Water Works Association (AWWA) estimates that 30 to 50 percent of the water sector workforce will be eligible for retirement within the next decade. At the same time, aging infrastructure is being replaced with modern automated systems that require more sophisticated technical skills than the manual operations they replace. The combination of retirements and modernization is driving aggressive hiring and compensation increases across the sector.
## How Water Treatment Automation Works
### Drinking Water Treatment
A typical drinking water treatment plant takes raw water from a river, lake, reservoir, or aquifer and processes it through a series of steps: coagulation and flocculation (adding chemicals that cause particles to clump together), sedimentation (letting the clumps settle), filtration (passing water through sand, gravel, and activated carbon), and disinfection (adding chlorine, chloramine, or using UV treatment to kill pathogens). Each step is controlled by automation systems.
PLCs (typically Allen-Bradley ControlLogix or CompactLogix, Schneider Electric Modicon, or Siemens S7 platforms) control pumps, valves, chemical dosing systems, and filter operations. Instrumentation continuously measures turbidity, pH, chlorine residual, flow rates, and pressure throughout the treatment process. A SCADA system (commonly built on platforms like Ignition by Inductive Automation, GE iFIX, Wonderware/AVEVA, or VTScada) provides operators with real-time visibility into the entire treatment process, stores historical data, generates alarms, and in many cases automates routine operations.
### Wastewater Treatment
Wastewater treatment plants receive sewage and industrial discharge and process it through primary treatment (physical settling of solids), secondary treatment (biological processes using activated sludge, trickling filters, or membrane bioreactors), and tertiary treatment (additional polishing through filtration, UV disinfection, or nutrient removal). Advanced plants may also include anaerobic digestion systems that convert biosolids into methane for energy recovery.
The automation complexity of a wastewater treatment plant often exceeds that of a drinking water plant. Dissolved oxygen (DO) control in aeration basins, return activated sludge (RAS) and waste activated sludge (WAS) management, chemical dosing for phosphorus and nitrogen removal, and biogas handling all require precise control loops. Modern wastewater plants may have 2,000 to 10,000 I/O points controlled by multiple PLC systems networked through a central SCADA platform.
## Career Paths
### Water/Wastewater SCADA Technician ($48,000 to $72,000)
SCADA technicians maintain and troubleshoot the automation systems that operate treatment plants and distribution/collection networks. Day-to-day work includes monitoring SCADA for alarms, responding to equipment failures, calibrating instruments (flow meters, level transmitters, pH analyzers, turbidity meters, dissolved oxygen probes), maintaining PLC I/O (replacing failed input and output modules, checking wiring terminations), and configuring SCADA graphics and alarm setups.
This role also includes maintaining the communication infrastructure — radio telemetry systems that connect remote pump stations and storage tanks to the central SCADA system, cellular data connections for remote monitoring, and fiber optic or Ethernet networks within treatment plants.
**Entry path:** Two-year degree in electrical technology, instrumentation, or electronics, plus one to two years of entry-level maintenance or operations experience. Many utilities hire operations staff and cross-train them into SCADA roles. State water/wastewater operator certification (Treatment Operator or Distribution/Collection Operator) is typically required or encouraged, even for SCADA-focused roles.
### Water/Wastewater Controls Engineer ($68,000 to $105,000)
Controls engineers design and implement the automation systems for water and wastewater facilities. They program PLCs, design SCADA graphics, configure control loops, write functional specifications, and commission new systems. In the water sector, controls engineers may work for utilities directly, for engineering consulting firms (HDR, Brown and Caldwell, Black & Veatch, Carollo Engineers, Arcadis), or for system integration firms that specialize in water automation.
A significant portion of water sector controls engineering involves upgrading aging infrastructure. Many treatment plants still operate on legacy systems — Allen-Bradley PLC-5, SLC-500, MicroLogix, or even relay-based controls — that need to be migrated to modern platforms. These migration projects require understanding both the old and new technologies, as well as the treatment processes the controls serve.
**Entry path:** A bachelor's degree in electrical engineering, computer engineering, or a related field is the traditional path. Alternatively, a two-year degree combined with five or more years of SCADA technician experience provides equivalent qualification at many organizations. State PE (Professional Engineer) licensure is valuable, especially for engineers at consulting firms who stamp design documents.
### Instrumentation and Calibration Specialist ($55,000 to $85,000)
Water and wastewater treatment depends on accurate instrumentation. Turbidity meters ensure that filtration is working. Chlorine analyzers ensure disinfection is adequate. Flow meters track water production and distribution. Level sensors manage tank inventories. pH, DO, and ORP sensors control chemical and biological treatment processes.
Instrumentation specialists install, calibrate, maintain, and troubleshoot these instruments. They perform scheduled calibration checks using certified standards, troubleshoot sensor failures, and replace instruments at end of life. They also work with the SCADA team to ensure that instrument signals are correctly scaled and alarmed in the control system.
**Entry path:** Two-year degree in instrumentation technology or electronics, plus ISA CCST (Certified Control Systems Technician) Level I or II certification. Water sector-specific training from instrument manufacturers (Hach, Endress+Hauser, Emerson Rosemount, Siemens) is valuable.
### Water Sector Cybersecurity Specialist ($85,000 to $130,000)
Following the Oldsmar, Florida incident — where an unauthorized user remotely accessed a water treatment plant SCADA system and attempted to increase sodium hydroxide dosing to dangerous levels — the water sector has prioritized cybersecurity. CISA (Cybersecurity and Infrastructure Security Agency) has issued water sector-specific guidance, and EPA has included cybersecurity in its Safe Drinking Water Act enforcement priorities.
Water utilities are hiring dedicated cybersecurity professionals or contracting with firms that specialize in water sector OT security. These roles require understanding of both water treatment processes and ICS cybersecurity fundamentals — the same skill combination described in detail elsewhere on the Automate America blog.
### Senior SCADA Manager / Water Automation Director ($95,000 to $140,000)
Senior roles that manage the entire SCADA and automation program for a utility. Responsibilities include capital planning (budgeting for system upgrades and replacements), vendor management, technology standards, cybersecurity oversight, and staff development. These positions require 10 or more years of water sector automation experience and strong management skills.
## Key Technologies
**PLC Platforms:** Allen-Bradley (ControlLogix, CompactLogix) dominates the North American municipal water sector. Schneider Electric (Modicon M340, M580) and Siemens (S7-1500) are also widely deployed. Smaller utilities may use Automation Direct or other cost-effective platforms.
**SCADA Platforms:** Ignition by Inductive Automation has gained significant market share due to its unlimited tag licensing model — particularly valuable for utilities with many remote sites. GE iFIX, Wonderware (AVEVA), VTScada, and ICONICS are also widely used.
**Instrumentation:** Hach (turbidity, chlorine, pH), Endress+Hauser (flow, level, analytical), Emerson Rosemount (pressure, temperature, flow), and Siemens (flow, level, process analytics) are the dominant instrument manufacturers in the water sector.
**Communication:** Many water utilities still rely on radio telemetry (spread-spectrum or licensed-band radios) for communication with remote sites. Cellular data connections (4G LTE, increasingly 5G) are replacing radio in some applications. Fiber optic networks connect sites within treatment plant campuses.
**Process Simulation and Optimization:** Advanced utilities are implementing digital twin technology and process optimization software (BioWin for wastewater biological modeling, WaterGEMS for distribution system modeling) integrated with SCADA data for real-time optimization.
## Why the Water Sector Is a Great Automation Career
**Job security:** Clean water is a non-negotiable public service. Water utilities do not have layoffs the way manufacturers do during economic downturns. Automation positions at utilities offer exceptional job stability.
**Public service:** There is genuine satisfaction in knowing that your work directly protects public health. Every correctly calibrated chlorine analyzer, every properly functioning SCADA alarm, every well-maintained PLC system contributes to delivering safe drinking water and protecting the environment.
**Benefits and retirement:** Municipal utilities typically offer comprehensive benefits packages including health insurance, defined benefit pension plans (increasingly rare in the private sector), and generous paid time off. Total compensation including benefits often exceeds private sector equivalents.
**Growing investment:** The 2021 Infrastructure Investment and Jobs Act (IIJA) allocated $55 billion for water infrastructure — the largest federal investment in water systems in history. This funding is driving modernization projects at utilities across the country, creating sustained demand for automation professionals.
**Career longevity:** The water sector workforce tends to have longer tenure than other automation sectors. It is common for water utility automation professionals to build entire 25 to 30 year careers at a single utility, advancing from technician to engineer to manager while developing deep expertise in their specific facilities.
The water sector needs automation professionals urgently. If you are looking for a career that combines technical challenge, job security, public service, and strong compensation, water and wastewater treatment automation deserves serious consideration. Automate America connects automation professionals with opportunities across all utility sectors. Build your profile today to access water and wastewater automation positions from utilities and consulting firms nationwide.
