As global requirements for water resource protection and environmental compliance continue to increase, wastewater treatment systems need not only stable treatment capabilities but also accurate and reliable process monitoring data.
A recent case published by the UK Environment Agency highlights the importance of reliable monitoring data. On September 8, 2026, the Environment Agency announced that United Utilities Water Limited had been fined £900,000 for five environmental permit breaches. The company was also ordered to pay £62,225 in prosecution costs and a £2,000 surcharge, bringing the total financial penalty to £964,225.
According to the Environment Agency, the case followed a partial collapse of a final effluent pipe at Fleetwood Wastewater Treatment Works, which reduced the amount of wastewater the treatment works could receive. During periods of rainfall, sewage was subsequently discharged from three coastal pumping stations. The Environment Agency investigated flow and spill data provided by the company and found that the conditions specified in the environmental permit had not been met at the time.
Under the permit requirements, the relevant pumping stations were permitted to discharge under specific conditions, including when the flow entering Fleetwood Wastewater Treatment Works reached 2,300 litres per second. However, the Environment Agency’s analysis of the data provided by the company indicated that this flow threshold had not been reached during the incident.
This case does not mean that every wastewater treatment issue can be addressed by a single flow meter. However, it clearly demonstrates an important principle: accurate and reliable process data provides an important foundation for wastewater treatment operations, abnormal-condition analysis, and environmental compliance.
For modern wastewater treatment systems, flow is only one of the key parameters that needs to be monitored. Level, pressure, differential pressure, and temperature data can also help operators understand the operating condition of equipment and processes. By integrating different measuring instruments with transmitters and automation control systems, a more comprehensive process monitoring system can be established.
1. Flow Monitoring: Understanding System Performance Through Process Data
Flow data helps operators understand the operation of liquid transfer and treatment systems.
From wastewater collection and pumping to transfer between different treatment units and final discharge, flow is an important process parameter. Continuous flow monitoring can help identify abnormal changes and provide basic data for equipment operation analysis and process control.
The case published by the UK Environment Agency also demonstrates that, in wastewater discharge scenarios subject to environmental permit requirements, flow data may be an important part of determining whether specified operating conditions have been met.
ELECALL provides flow measurement products for a range of industrial applications. Depending on the actual operating conditions, suitable flow monitoring solutions can be selected for applications such as small-scale water treatment equipment, auxiliary circulation systems, and equipment inlet or outlet pipelines where direct visual flow indication is required.
For large wastewater treatment plants, main pipelines, discharge pipelines, or applications involving strict regulatory measurement requirements, flow measurement technology should be selected based on factors such as pipe diameter, medium characteristics, required accuracy, installation conditions, and applicable regulations.
2. Level Monitoring: Supporting Pump Control and Overflow Prevention
Reliable level monitoring is essential for wastewater collection tanks, storage tanks, equalization tanks, and pump pits.
ELECALL float level switches can be used for high- and low-level detection and, depending on system design, can provide control signals for pump start/stop control, level alarms, and overflow prevention.
For applications where the system only needs to determine whether the liquid has reached a specific level, point-level switches provide a simple and effective control solution.
For automated systems that require continuous level information, continuous level measurement and level transmitters can be used to provide real-time level data and transmit the measurement signal to a PLC, control cabinet, or monitoring system.
Typical applications include:
- Wastewater collection tanks
- Pumping stations
- Sewage storage tanks
- Equalization tanks
- Industrial wastewater treatment systems
3. Pressure and Differential Pressure Monitoring: Understanding Pipeline and Equipment Conditions
Pressure data can help operators understand the operating condition of pumps, pipelines, and other equipment.
When system pressure changes abnormally, further inspection may be required to determine whether the cause is related to pump operation, valve position, pipeline resistance, or other process conditions.
Differential pressure monitoring is particularly useful for filtration systems and other applications where changes in fluid resistance need to be monitored.
For example, as a filter gradually becomes clogged, the resistance to fluid flow may increase, resulting in a higher pressure difference between the upstream and downstream sides of the filter. Monitoring this differential pressure with a differential pressure gauge, digital differential pressure instrument, or differential pressure transmitter can provide useful information for equipment inspection and maintenance.
ELECALL offers different types of pressure and differential pressure measurement products, including mechanical instruments for local indication and digital measurement products with signal output functions, depending on the model and configuration.
4. Transmitters: Connecting Field Measurements to Control Systems
Modern wastewater treatment systems increasingly rely on automated control.
Installing a field instrument alone does not mean that its measurement data can be automatically used for process control. Transmitters convert measured parameters into standardized signals that can be recognized and processed by control systems, such as the widely used 4–20 mA signal.
A typical monitoring process can be represented as:
Through this architecture, field data such as flow, level, pressure, and temperature can be further used for trend monitoring, alarms, and automatic control.
For example, a level transmitter can continuously provide level data to a control system, allowing the system to control pump operation according to predefined logic. Pressure or differential pressure transmitters can similarly transmit equipment operating data to the control system for centralized monitoring.
5. From Individual Instruments to Comprehensive Wastewater Monitoring
Reliable wastewater process monitoring does not normally depend on a single parameter.
Flow helps operators understand liquid transfer and treatment conditions.
Level supports the control of tanks, reservoirs, and pumping stations.
Pressure can provide information about pipeline and equipment operating conditions.
Differential pressure can indicate changes in resistance across filters and other equipment.
Transmitters connect field measurement data with automated control systems.
Therefore, a typical wastewater measurement system may include:
ELECALL provides measurement and monitoring products covering flow, level, pressure, differential pressure, and temperature for industrial and water treatment applications. The appropriate combination of instruments can be selected according to the actual operating conditions and monitoring requirements of each system.
Conclusion
The recent case published by the UK Environment Agency demonstrates the importance of reliable operational data in wastewater treatment systems subject to environmental permit requirements. The investigation specifically involved flow and spill data provided by the operator, highlighting the role that process measurement data can play in operational analysis and compliance management.
Reliable wastewater monitoring, however, involves more than flow measurement alone. Level, pressure, differential pressure, temperature, and transmitter technologies together form an important measurement foundation for industrial process monitoring.
From local visual indication to continuous measurement and the transmission of field data to PLC and automated control systems, properly selected measurement instruments can help operators better understand system conditions and provide useful data for abnormal-condition analysis, equipment maintenance, and process control.
ELECALL provides measurement and monitoring products covering flow, level, pressure, differential pressure, and temperature for water treatment and industrial process applications. Product selection should always be based on the actual medium, measurement range, installation conditions, accuracy requirements, and application requirements.
Source
UK Environment Agency, GOV.UK — “Water company fined record £900k after coastline sewage spill”
Published: September 8, 2026
Official source: GOV.UK
Cart