Water · Sanitation Representative scenario

Preventing sewage pump-station overflows before they reach the river

The treatment works was fine. The spills were happening upstream — at unmanned pump stations no one was watching.

At a glance

The deployment in one view.

Setting

A municipal sanitation network with a fleet of sewage pump stations, several of them repeat overflow offenders

Problem

Stations spilling raw sewage during pump failures, load shedding and vandalism — discovered only via community complaints, not a number

What we monitored

Wet-well level, pump run/fail/trip and power status, overflow detection and rising-main pressure

Alerts

High-level, rate-of-rise, pump-failure and power-loss alerts to the standby team, with station priority

Resilience

Solar-backed sensing and edge buffering so monitoring survives the outage that causes the spill

The shift

From finding spills after the fact to catching them as they start

The challenge

A treatment works can run perfectly and a town can still end up with sewage in the street and the river — because the failure is upstream, in the collection network. A sewage pump station is unmanned, often remote, and its failure modes are invisible until the overflow is already happening: a pump trips or blocks, a power feed drops during load shedding while sewage keeps arriving, a panel is stripped by cable thieves, or a rising main blocks. The wet well fills and tops the overflow weir long before anyone drives past, and the first signal is usually a community complaint or a dead river reach — a public-health and environmental incident, a likely Section 19 / DWS matter, and a Green Drop mark against the collection system.

The core gap: the works was monitored; the dozens of pump stations feeding it were not. Each unmanned station was a blind spot, and the ones that spilled most often were known by reputation — not by data that could warn a crew in time.

Our approach

Start with the worst offenders. Rank stations by the consequence of a spill — those whose overflow reaches a river, a school or a main road first — and instrument those before extending across the network (see sewer network & pump station monitoring).
Read what's already on the station. Tie into the float switches, panel signals and any flow meter already there, adding sensors only where there's a gap — a monitoring layer over the existing control gear, not a rip-and-replace.
Watch the early signs. Continuous wet-well level with high-level and rate-of-rise alarms, plus pump run/fail/trip status and rising-main pressure — the earliest indication a pump isn't keeping up, well before the overflow weir.
Alarm to the standby team. A high wet well, a pump failure or a power loss reaches the responder immediately, with station priority — so they roll a pump, tanker or generator to the right station first.
Survive the outage. Solar-backed sensing and edge buffering keep level reporting and alarms alive through load shedding — exactly the window when spills happen — and an immediate "station went dark" alert is often the first sign of theft or vandalism, on the addaNet platform.

What changed

From cleaning up spills to preventing them.

Spills headed off

A filling wet well or a stalled pump raises an alarm while there's still time to respond — turning a reportable pollution event into a contained call-out.

The right station first

During load shedding the team can see which stations are dark and how full each is, so a generator or tanker goes to the most critical one instead of the nearest.

Evidence, not anecdote

A continuous record of levels, runtimes and overflow events documents the network's behaviour — useful for prioritising rehabilitation and for the regulator.

Why it fits South Africa

For ageing networks, thin teams and routine outages.

Sewage pump stations are exactly where South African sanitation networks are most exposed: unmanned, often vandalised, and dependent on a grid that drops several times a day while the sewage keeps arriving. Real-time monitoring is a force-multiplier for a stretched standby team — it watches every station around the clock, alarms the failures that cause spills, and points the crew at the station that matters most. Solar backup and edge buffering mean load shedding, which itself stops the pumps, never blinds the monitoring at the very moment a spill is forming. The payback is the spill you prevent: most networks have a handful of repeat-offender stations, and those are where the monitoring pays for itself first.

See sewer network & pump station monitoring and the guide on sewage pump stations & spill prevention.

This case study illustrates addanode's approach through a representative scenario; client details and figures are omitted by policy, and obligations should be confirmed against your water-use licence and the latest DWS / Green Drop requirements.

Tired of finding out about a spill from the community?

Tell us about the pump stations that keep overflowing — the load-shedding casualties, the vandalised panels, the repeat offenders. We'll scope the level, pump and power sensing, the alarms and the solar backup, and tell you which station to start with.

Talk to our Water Team Sewer network monitoring →

Preventing sewage pump-station overflows before they reach the river

The deployment in one view.

The challenge

Our approach

From cleaning up spills to preventing them.

Spills headed off

The right station first

Evidence, not anecdote

For ageing networks, thin teams and routine outages.

Tired of finding out about a spill from the community?

Related reading

Sewer network & pump stations

Sewage pump stations & spills

Wastewater works back to compliance