If you run a food or beverage plant, your wastewater bill is probably one of the least examined line items on your P&L. It shows up every month, it grows a little each year, and it feels like a fixed cost of doing business. We would ask you to look at it differently. A sewer surcharge is not a fixed cost. It is a recoverable product loss, measured in dollars per kilogram and sent down the drain.
Sustainable wastewater management is the practice of reducing the amount of organic and nutrient loading a facility sends to the sewer at the source, so that less treatment is needed downstream and less product value is lost in the first place. When done well, it lowers operating cost, shrinks the capital needed for end-of-pipe treatment, and cuts the environmental footprint as a co-benefit. The profit comes first, and the planet benefits because the two move together.
That is the approach we have built our firm around for more than two decades. Enviro-Stewards is a Canadian engineering firm and Certified B Corp that has worked with food and beverage processors since 2000. Our signature approach to problem-solving is root-cause analysis: we diagnose the causes of waste and loss in your plant, then fix them, rather than treating the symptoms at the end of the pipe. This post walks through how sewer surcharges work, why they are rising, and how prevention-first thinking can turn a growing cost into a payback.
How Sewer Surcharges Are Calculated, and Why They Are Rising
Municipalities charge industrial users for more than just the volume of water they discharge. Municipal sewer charges are typically based on metered water use, with wastewater flow often assumed to be equal to the incoming flow. Where certain wastewater parameters exceed by-law concentration limits, users may be requested to enter a surcharge agreement with the municipality. The surcharge is generally based on the concentration of key parameters measured through sampling and the volume discharged, which together determine the mass of those parameters in the wastewater. The most common surchargeable parameters include biochemical oxygen demand (BOD), total suspended solids (TSS), and nutrients, chiefly total Kjeldahl nitrogen (TKN) and total phosphorus. Higher concentrations of these parameters require more intense, and therefore expensive, treatment at the municipal wastewater treatment plant.
The math is straightforward. If your plant has a surcharge agreement and discharges a high concentration of BOD, you pay a rate per kilogram of BOD on top of your volume charge. The higher the concentration and the more water you discharge, the greater the loading and the larger the surcharge. For a food plant, that loading is largely ingredients and products: sugars, starches, fats, proteins, and cleaning residues that should have ended up in a package, not in the sewer.
Surcharge rates are not static, and some are trending up. The City of Toronto currently charges $0.64 per kilogram of BOD, $0.70 per kilogram of TSS, $1.43 per kilogram of TKN, and $2.24 per kilogram of total phosphorus, with fines for non-compliance up to $100,000 per day. York Region raised its nutrient surcharges sharply between 2022 and 2026: total phosphorus went from $3.61 to $4.29 per kilogram, an increase of 18.8 percent, and TKN went from $1.34 to $1.63 per kilogram, up 21.6 percent (https://www.york.ca/media/76651/download). Nutrient surcharges are rising, and they are rising fast.
There is a structural reason for this. Canada’s Wastewater Systems Effluent Regulations (SOR/2012-139) set national standards that municipal treatment plants must meet for treated effluent. Meeting those standards requires treatment capacity, and stronger industrial wastewater consumes more of that capacity and costs more to treat. Municipal surcharge programs help recover those additional treatment costs and encourage industrial users to reduce the effluent loads they send to the sewer. For industrial facilities, the financial pressure is clear: wastewater that is expensive to treat is also becoming more expensive to discharge.
Prevention-First Versus End-of-Pipe Treatment
When a food plant’s wastewater is too strong for the municipal sewer, the conventional answer is to build an on-site treatment system at the end of the pipe. That is a large capital project: tanks, pumps, aeration, chemical dosing, and ongoing energy and maintenance. It treats the symptom, but it does nothing about the product that is being lost to the drain in the first place.
We flip the paradigm. Instead of asking how to treat the wastewater, we ask why it is strong in the first place. Where is the product going down the drain? Where is the water being used to carry it away? Fixing those root causes removes the loading at the source, which shrinks or eliminates the need for treatment capital altogether.
The proof is in our project history. At a food and beverage plant in Oakville, Ontario, a prevention-first assessment identified enough recoverable product and water savings that the facility was able to avoid building a treatment plant entirely. The result was reduced water use, an 80 percent reduction in loading to the sewer (even as production increased by 66) resulting in approximately $350,000 in annual savings, with a payback period of just over six months. The project went on to win a National Sustainability Award.
The same logic applied at the Jackson Triggs winery. Previousn-plant pollution-prevention work reduced organic loading by two thirds and wastewater volume by one half. Anaerobic treatment then removed 97.5 percent of the remaining organics. The combined result eliminated the sanitary sewer surcharge and reduced the capital cost of the treatment system by 50 percent.
The Financial Case: What Prevention Is Worth
While investigating the root causes of wastewater concentrations and product losses, we have found it worthwhile to broaden the assessment to the entire facility. This wider approach can uncover additional opportunities to reduce product loss, improve energy and water efficiency, and lower GHG emissions. Combined, these opportunities can further strengthen the financial case for action.
The numbers across our food and beverage work tell a consistent story. Across 50 food and beverage processors, our assessments identified average savings of about $230,000 per facility per year from food-loss prevention alone. That is not a theoretical figure. It is the average of what our root-cause work has found in real plants.
The opportunity scales with the size of the operation. In our engagement with Maple Leaf Foods, we identified roughly $350,000 in energy and water savings opportunities per facility across over 30 plants. At Campbell Canada, the measures we designed were projected to avoid about 938 tonnes of food waste per year, recover approximately $706,000 in product value, and avoid about 4,000 tonnes of greenhouse gas emissions annually, all with a payback of under six months.
Notice what these projects have in common. The payback windows are short, often measured in months rather than years. The savings come from recovering a product that was already paid for, and from not paying to treat it, heat it, or haul it away. That is the core of the argument: most manufacturing waste is paid for twice. You pay for the input, the energy to process it, the water and cleaning to carry it away, and then the disposal or surcharge on top. Fixing the root cause can reduce all of those costs at once.
This is why we lead with the profit case. Sustainability that pays for itself is the easiest kind to get funded, and the most likely to last. The environmental benefit follows from the same fix, because less product lost means less waste and fewer embedded energy, water, and greenhouse gas impacts in every tonne you do not throw away.
Where to Start: First Steps Toward Prevention
You do not need a multi-year program to begin. The first step is a wastewater and product-loss assessment, where our engineers measure your flow, sample your discharge, and trace where the loading is coming from. We map the plant, quantify the losses, and build an opportunity register that ranks every finding by cost, savings, and payback.
Then we prioritize. The best projects are often the no-cost and low-cost items: fixing a stuck float valve, changing a rinse procedure, recovering a product from a line flush, or adjusting a cleaning cycle. These are the items that pay back in weeks and build the case for the larger capital projects that follow. We have seen plants fund their own bigger improvements out of the savings from the small ones.
The assessment itself is the highest-value step, because it tells you what those wastewater and product losses are costing you.. If you want to understand the treatment side of the equation before you start, our wastewater treatment page is a great place to start, and because water conservation is often the cheapest way to reduce both your water bill and your surcharge, our water conservation page is worth a look as well.
To increase the savings potential, we also recommend taking a broader look at your facility’s equipment and processes to identify energy, water, and other conservation opportunities beyond wastewater and product loss.
The Bottom Line
Your sewer surcharge is a signal. It can point to valuable product and water leaving your plant as waste.
Read it that way, and it stops being a fixed cost and becomes a roadmap to savings. The plants that treat it as recoverable product loss are the ones cutting their bills, reducing their wastewater treatment needs, and funding their own improvements out of the savings. A broader facility assessment can build on those savings by identifying additional opportunities to reduce energy and water use and GHG emissions.
We have been doing this work since 2000, and we would be glad to help you find the same opportunities in your facility. Schedule a Free Consultation and we will start with the numbers!