Leakage in rising sewer mains remains a persistent challenge for operators. Pollution events are often associated with catastrophic failures, but many incidents arise from small, undetected leaks that develop over long periods. A common contributor is leakage through non-return valves (NRVs) at pumping stations. When NRVs fail to seal correctly, wastewater can drain back into the wet well, increasing pump run frequency, accelerating mechanical wear on both pumps and rising mains and increasing energy consumption. Continuous hydraulic monitoring can address both acute and chronic failure modes on rising sewer mains. Some real operational data and a case study are used to demonstrate how high-resolution pressure monitoring can provide early warning of ruptures that may otherwise escalate into major pollution incidents. This monitoring approach can also identify subtle, low-rate leakage associated with leaking NRVs and other discreet defects that are invisible to conventional instrumentation system. By identifying these issues early, operators can intervene proactively. In several cases, energy savings achieved by reducing unnecessary pumping cycles have been sufficient to offset the cost of continuous monitoring and NRV replacement. We’ll highlight how targeted monitoring supports improved asset protection, reduces environmental risk, maintains regulatory compliance and facilitates more efficient operation of wastewater networks.