Rising Main Investigation & Repair

A rising main is a pressurised pipe that moves foul water or wastewater from a low point, often a pump station, up to a higher discharge point. When something goes wrong, the impact can be immediate: alarms, loss of pumping, flooding risk, odours, and disruption to the building.

ICE Drainage provides rising main investigation and repair across London and the Home Counties, supporting commercial sites, hospitality operators, and facilities management teams.

What is a rising main, and why does it fail?

Rising mains are under pressure, so failures can be more complex than standard gravity drainage issues. Common causes of rising main problems include blockages from wipes, rags, debris, and solids, fat, oil, and grease build-up from kitchens, scale and silt accumulation restricting flow, air locks and poor venting, damaged non-return valves or pump faults causing backflow, pipe deterioration, joint failure, or ground movement, and incorrect pump operation such as short cycling or overheating.

Because rising mains are pressurised, symptoms can appear away from the actual fault location. A proper investigation is key.

Signs you may have a rising main problem

If you manage a site with a pump station, sewage pumping system, or basement drainage, watch for pump station or high-level alarms, repeated pump trips or pumps running continuously, slow discharge or rising levels in the wet well, foul odours near chambers, plant rooms, or external areas, visible leaks, wet patches, or sewage staining along the route, and back-ups affecting toilets, kitchens, or lower-level drainage.

If there's any risk of flooding or foul water exposure, call ICE Drainage.

Our rising main investigation process

We take a structured approach to identify the cause quickly and recommend the right fix.

1) Initial triage and site details

We confirm the system type, alarm status, access points, and whether pumping has stopped.

2) On-site assessment and safety checks

We assess hazards, isolate risks, and plan safe access to chambers and plant.

3) Fault finding and investigation

Depending on the situation, this may include checking pump operation and controls, inspecting valves and discharge points, assessing likely blockage locations, and identifying leak indicators and pressure-related symptoms.

4) Clear recommendations

You'll get a practical plan: unblock, repair, replace, or schedule planned works.

Rising main blockage removal

A rising main blockage can stop pumping entirely and cause a rapid level rise in the wet well. Typical causes include wipes and sanitary waste, food waste and grease, debris introduced during maintenance, and scale build-up over time.

We'll work to identify the most likely restriction point and advise the safest, most effective route to restore flow.

Rising main leak detection and repair

Leaks on a rising main can be messy and disruptive, and because the line is pressurised, even small failures can cause significant issues.

We can help by locating suspected leak areas using surface indicators and chamber checks, identifying whether the issue is pipework, joints, or valves, advising on repair options and urgency, and supporting planned repairs to reduce downtime.

If you suspect a leak, call ICE Drainage.

Pump station and valve issues

Sometimes the rising main isn't the only problem. Faulty valves or pump issues can mimic a blockage. Common related faults include non-return valve failure causing backflow, air release valve issues, pump wear or impeller blockage, and control panel or float switch problems.

We'll help you separate pump faults from rising main faults, so you're not paying for the wrong fix.

Rising main services for hospitality and facilities management

Rising main issues can shut down toilets, kitchens, and guest facilities, which is why we prioritise clear communication and fast action. We regularly support hotels, pubs, bars, and restaurants, commercial kitchens and food sites, retail and shopping centres, schools, colleges, and public buildings, managed estates and property portfolios, and facilities management providers.

Planned maintenance to reduce rising main failures

Many rising main incidents are preventable with planned checks and cleaning. A sensible programme may include routine inspections of chambers and discharge points, wet well cleaning and debris removal, monitoring pump performance and run times, valve checks including non-return valves, and early identification of scale or grease build-up.

If you're managing multiple sites, we can help you reduce emergency call-outs and improve reliability.

Why choose ICE Drainage?

You need a contractor who understands pressurised wastewater systems and responds properly when things go wrong.

Rapid response across London and the Home Counties
A commercial-first approach for hospitality, FM, and managed estates
Competitive pricing with clear next steps
Safety-led engineers working to industry standards
Credentials including Safe Contractor, SSSTS, and Constructionline Gold

ICE Drainage is a specialist service expansion of ICE Cleaning, a leading sewage cleaning company in the UK.

What to do if you suspect a rising main failure

If you're dealing with alarms, rising levels, or suspected leaks, reduce water usage on site where possible, keep people away from any foul water, note alarm messages and pump behaviour, and if it's safe to do so, confirm access to chambers or plant rooms. Don't attempt confined space entry unless you're trained and equipped to do so. Call ICE Drainage for urgent support.