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Water Quality
Water can lose quality after leaving the treatment plant due to factors inherent to the network itself: natural chlorine decay over residence time, contaminant intrusion during low-pressure events, or biofilm growth in stagnant flow sections. Manual sampling at a handful of network points, on a weekly or monthly basis, fails to detect these events in time, leaving utilities without visibility into what happens between the plant and the end user.
Water quality monitoring in distribution networks solves this through instrumentation that continuously measures parameters such as residual chlorine, turbidity, conductivity, and pressure at strategic network points—regulation tanks, network endpoints, low-pressure zones, and higher-risk sectors. Unlike in-plant monitoring, which validates the water as produced, this solution tracks what happens afterward: residual chlorine decay, water residence time in the network, and events that could compromise quality during distribution.
The operational impact is measurable: drops in residual chlorine or increases in turbidity that signal an emerging quality issue are detected early, network zones with longer water residence time—and therefore higher risk—are identified, and continuous evidence is generated to demonstrate regulatory compliance across the entire network, not just at the plant outlet. This reduces public health risk and strengthens the technical case in the face of claims or audits.
Utilities that invest in network quality monitoring gain more than immediate response capability; they build a network-wide quality risk map that helps prioritize where to reinforce disinfection or intervene in infrastructure.
Water that leaves a treatment plant meeting all regulatory parameters does not necessarily retain that same quality at the point where it finally reaches the user. Between the plant and the tap, water travels through kilometers of piping, regulation tanks, and zones with different hydraulic behavior, where residual chlorine decays over time, biofilms can form in low-flow sections, and low-pressure events can favor the intrusion of external contaminants. Monitoring quality only at the plant outlet leaves this part of the system without visibility.
How it works.
The solution installs online sensors for residual chlorine, turbidity, conductivity, and pressure at strategic network points, selected based on a prior hydraulic analysis: regulation tanks, network extremities with longer residence time, zones historically vulnerable to low pressure, and representative points across different hydrometric sectors. These sensors connect to an RTU that transmits data via telemetry to a central SCADA system, where a digital platform compares values against regulatory limits and expected ranges for each point, generating alerts for chlorine drops, turbidity increases, or negative-pressure events that could represent an intrusion risk.
Business value.
Early detection of a quality issue in the network allows intervention — reinforcing disinfection at a specific point, isolating a sector, or investigating the cause — before the problem spreads or reaches a larger number of users. Having continuous quality evidence across the entire network, not just at the plant, strengthens the organization's position in audits, citizen complaints, or requirements from health authorities.
Operational benefits.
Continuous monitoring reduces reliance on manual sampling campaigns to understand network conditions, allows re-chlorination points to be prioritized where chlorine decay is greatest, and generates a data history that helps identify seasonal patterns or recurring risk zones. Integration with hydraulic sectorization analysis helps explain why certain points show higher risk, beyond the isolated quality reading itself.
Technology overview and integration.
Quality sensors integrate natively with SCADA platforms and data historians, and through APIs can feed geographic information systems (GIS) to visualize quality risk on the network map, asset management systems (CMMS) to schedule re-chlorination or rehabilitation of network sections, and Business Intelligence platforms for regulatory reporting. This solution naturally runs on the same digital platform as plant-level treatment monitoring and online district metering, making it possible to correlate quality, residence time, and hydraulic behavior on a single dashboard.
Typical applications.
Monitoring residual chlorine in regulation tanks and network extremities, detecting low-pressure events with intrusion risk, identifying zones with longer water residence time, verifying regulatory quality compliance at network points beyond the plant outlet, and providing technical support for citizen complaints about water quality.
Related solutions.
Together with plant-level treatment monitoring and online district metering, this monitoring completes an end-to-end view of quality and efficiency from source to user: the plant guarantees quality at the source, district metering explains hydraulic behavior by zone, and network monitoring confirms that quality holds along the way.
Future scalability.
The quality sensor network, combined with hydraulic sectorization data, lays the groundwork for predictive water-age and quality-risk models across the network, as well as for digital twin architectures that simulate residual chlorine and other parameters under different operating scenarios.
If your organization needs to assess water quality at network points beyond the plant outlet, Marfel's team can help define the technical scope of this monitoring.