Municipal water treatment combines source-water management, treatment, storage and distribution. UV can provide a physical microbial inactivation stage within this treatment train, with system selection based on the water entering the UV reactor and the required treatment objective.

Peak flow, minimum UV transmittance (UVT), target microorganisms and required UV dose are key design inputs. Lamp ageing, quartz-sleeve fouling, operating pressure and installation hydraulics also need to be considered when specifying the equipment.

Monitoring and control requirements should be defined during project design. Depending on the selected configuration, these may include lamp-status indication, UV intensity monitoring, alarms, flow limits and integration with the site's control system.

UV does not leave a disinfectant residual in the distribution network. It should therefore be coordinated with the wider treatment and distribution strategy, including residual disinfection where required. Drinking-water projects also need equipment documentation, performance validation and approvals appropriate to the local authority's requirements.

Plan access for lamp replacement, quartz-sleeve cleaning and sensor maintenance. Pipework orientation, isolation arrangements and control-cabinet placement should support both daily operation and routine servicing.

Technical references: U.S. EPA UV Treatment Toolkit and Disinfection Profiling and Benchmarking Guidance.