How sewer level monitoring works

Smarter wastewater monitoring starts below the surface

If you’re a council, utility, or facilities manager dealing with wastewater, you’ve probably heard the term sewer level monitoring thrown around a fair bit. But how does it actually work? And why is it becoming a must-have for proactive infrastructure management?

Let’s take a look underground.

What is sewer level monitoring?

Sewer level monitoring is the process of continuously measuring the height of wastewater within sewer pipes or access chambers. This helps identify flow patterns, detect blockages, predict overflows, and manage stormwater events in near real time.

It’s a key part of wastewater monitoring strategies for councils and utilities aiming to reduce environmental risk, maintain compliance, and save money on emergency response.

A Captis S2 data logger attached to a float switch for contact measurement.

The tech behind it

Modern sewer monitoring uses a combination of non-contact sensors, battery-powered IoT devices (like Captis and Spectra), and cloud-based data platforms (like Kallipr Kloud) to give you real-time visibility into what’s happening underground.

Why It Matters

A well-run sewer level monitoring network means:

• Fewer Overflows: Get early warnings before things back up
• Lower Maintenance Costs: Identify trouble spots without sending someone to open a lid
• Better Planning: Know when and where inflow and infiltration is happening
• Improved Environmental Compliance: Prove you’re on top of your wastewater game

A Captis S2 data logger with a Kallipr radar sensor for non-contact measurement

What makes a good sewer monitoring setup?

Not all systems are created equal. A robust wastewater monitoring solution should be:

• Rugged – Sewer chambers are hot, humid, and corrosive. IP68 isn’t a nice-to-have, it’s essential.
• Low Maintenance – Long battery life (we’re talking years, not months) and remote updates help keep OPEX low.
• Flexible – Every site is different. You might need radar, ultrasonic, pressure-based sensors or a combo of all three.
• Scalable – Start with five critical sites, grow to 500. Your system should grow with you.
• Integrated – Data should flow into your existing platforms and systems, not live in its own bubble.

Real-world impact

One of our customers, Sydney Water, used sewer level monitoring to detect over 500 blockages in high-risk areas, saving an estimated $400,000 a month in overflow response and cleanup costs.

That’s the power of smart data in dirty places.

Final thoughts

Sewer level monitoring is now a critical step towards smarter, more sustainable infrastructure.

Whether you’re monitoring dry-weather base flow, managing storm events, or preventing costly overflows, the right monitoring system can make the invisible visible, and give your team the data they need to act faster and smarter.

Looking to improve your wastewater monitoring? We can help you build a scalable, low-maintenance solution that works in the real world. Check out our sewer monitoring solution or get in touch with the team to chat through your network.