Key Takeaways

• Sewer level monitoring measures wastewater depth continuously, so crews see problems forming instead of reacting after an overflow.
• Real-time alerts are among the most dependable early warnings for blockages, grease buildup, and wet-weather surcharging.
• Remote, sensor-based monitoring cuts routine manhole inspections and sends crews only where the data points.
• Continuous level data strengthens SSO reporting, capacity planning, and NPDES permit compliance.
• RH Borden pairs it with SL-RAT acoustic assessment, BASINiQ I&I sensing, and MVM digital twins for a full system picture.

Sewer level monitoring uses real-time sensors to track wastewater depth in pipes and manholes, warning operators of blockages and surcharges before they cause sewer overflows.

Most sanitary sewer overflows do not happen without warning. They build slowly as a pipe fills, a blockage forms, or stormwater pushes a line past capacity. Sewer level monitoring catches that warning: sensors in manholes, wet wells, and high-risk segments let a utility watch the depth of flow around the clock and act before sewage reaches the street, turning reaction into prevention.

Understanding Sewer Level Monitoring

Sewer level monitoring is the practice of continuously measuring how high wastewater rises inside a sewer asset and reporting that reading to operators in real time. Instead of sending a crew to lift a lid and look, the system watches the line and flags any change that points to trouble.

Why level is such a useful signal

Level is the earliest measurable sign that something is wrong downstream. A partial blockage, a collapsed pipe, or a surge of inflow all show up first as rising water, so a level threshold gives operators a head start a complaint call never could.

How Does Sewer Level Monitoring Work?

A sensor above the flow measures the distance to the water surface, converts it into a depth reading, and sends it to a cloud dashboard at set intervals. When the depth crosses a preset alarm point, the system alerts staff by text or email.

Setting smart alarm thresholds

Operators set a warning level and a critical level as a percentage of pipe diameter. A line that normally runs at twenty percent depth might warn at sixty percent and alarm near surcharge. Tuning these setpoints to each site keeps alerts meaningful and limits noise.

Catching trends, not just spikes

Good monitoring reads the shape of the data over time. A slow climb over several days often signals grease or root intrusion, while a sharp jump during rain points to inflow and infiltration. Those patterns turn raw numbers into a maintenance plan.

Key Components of a Sewer Level Monitoring System

A complete sewer level monitoring system combines a sensor, power source, communications link, and software, all built to survive a harsh, corrosive environment.

Sensors

Ultrasonic and radar sensors measure level from above the flow without touching it, keeping them clean and low-maintenance. Pressure transducers sit in the flow and suit sites where foam or debris blocks an overhead signal.

Power and communications

Most field units run on long-life batteries or solar, so no wired power is needed at the manhole. They send data over cellular networks, so a crew does not need WiFi at the site to get reports.

Software and alerts

A central dashboard stores history, charts trends, and manages alarms. It is where supervisors confirm a real event versus a blip and dispatch the right response.

How Sewer Level Monitoring Helps Prevent Sanitary Sewer Overflows (SSOs)

Sewer level monitoring prevents SSOs by giving crews lead time to clear a problem before water leaves the system. When a sensor detects an abnormal rise, staff can jet the line, deploy a bypass pump, or clear a trouble spot while the pipe still has capacity.

Watching the spots that fail first

Every collection system has repeat offenders: a flat segment that collects grease, a low manhole that takes on stormwater, a siphon prone to debris. Sensors at these known weak points catch the failures that cause most overflows. The data also shows whether a cleaning schedule is working or whether a segment needs rehabilitation instead.

Importance of Remote Sewer Level Monitoring

Remote sewer level monitoring matters because it puts eyes on every monitored asset at once, day and night, without sending anyone into the field. A small utility cannot inspect hundreds of manholes by hand, but a network of sensors reports continuously and only calls for a truck when the readings justify one.

Doing more with the same crew

Remote monitoring lets a lean team cover a large system. Crews stop checking healthy lines by hand and focus on the assets the data has flagged, which means faster response and fewer emergency call-outs.

Benefits of Sewer Level Monitoring for Municipalities

For municipalities, sewer level monitoring lowers risk, controls cost, and produces the records regulators expect.

Lower cost and fewer emergencies

Preventing one overflow can offset a year of monitoring. Cleanup, fines, and damage claims far exceed the cost of catching a blockage early, and condition-based cleaning cuts wasted truck rolls.

Stronger compliance and reporting

Continuous data creates a defensible record for SSO reporting and supports the expectations tied to many NPDES permits. When an event does occur, operators can show exactly what happened and when.

Longer asset life

Spotting surcharging and chronic inflow early means pipes are rehabilitated before they fail, stretching the life of expensive underground infrastructure.

Bringing Sewer Level Monitoring to Your Wastewater System with RH Borden

Sewer level monitoring has become one of the smartest investments a municipality can make, turning a reactive job into a managed program that protects the public and the budget. RH Borden and Company LLC is a trusted wastewater technology provider based in Lehi, Utah, serving municipalities across the United States with advanced, data-driven sewer system maintenance solutions. We specialize in helping cities transition from traditional, labor-intensive maintenance to smarter, technology-enabled infrastructure management.

At RH Borden, we deliver innovative wastewater solutions including Acoustic Assessments using SL-RAT technology to quickly identify cleaning priorities, BASINiQ sensor networks for detecting inflow and infiltration (I&I) sources across sewer basins, and Manhole Virtual Models (MVM) that create digital twins of infrastructure assets to assess condition and guide rehabilitation decisions. Our solutions are designed to improve efficiency, reduce unnecessary maintenance costs, and extend the life of wastewater infrastructure through accurate, actionable, data-driven insights. Contact us today at 385-510-3223.

Frequently Asked Questions

How much does a sewer level monitoring system cost to install and maintain?

Cost depends on the number of sites and sensor type, but most utilities budget a modest per-site hardware cost plus an annual data and software subscription. Because preventing one overflow often covers a year of monitoring, systems tend to pay for themselves quickly. Modern sensors are so inexpensive that they cost less than quarterly cleaning.

How are the sensors powered, and how do they send data? Do we need WiFi at the manhole?

No WiFi is required. Field units typically run on long-life batteries or solar and transmit over cellular networks, so each site reports on its own without wired power or local internet.

How reliable are the readings, and will the sensors trigger false alarms?

Modern sensors are accurate and stable in sewer conditions. False alarms are minimized by tuning thresholds to each site and reviewing trends, so a brief blip is confirmed before a crew is dispatched.

Can sewer level monitoring help us with SSO reporting and regulatory compliance?

Yes. Continuous data gives you a time-stamped record of conditions before, during, and after an event, which supports SSO reporting and the CMOM documentation tied to many NPDES permits.

Do we have to dig up or shut down lines to install the sensors?

No. Most level sensors mount inside an existing manhole with no digging and no service interruption, so installation is fast and avoids the disruption of construction.