 Municipal infrastructure incorporates three types of water: domestic, storm, and waste. Domestic water is the water that comes from our taps and is used for drinking, cooking, cleaning, etc. This is otherwise known as potable water. In St. Thomas, the source of the potable water is Lake Erie. The water is suctioned out of the lake and treated to remove sediment, minerals, and bacteria. That water travels to St. Thomas via a pipeline, is then pumped again, and distributed through watermains that travel under streets across the city. The domestic water in St. Thomas is plentiful, safe, and consistent. The domestic water industry in Ontario is frequently tested and highly regulated to ensure public safety. Please find more details about our drinking water quality here: Consultant Resources - City of St. Thomas  The second type of water is stormwater. This is composed of precipitation that hits the ground and is conveyed back to Lake Erie. When new developments are built, they must match the pre-development runoff peaks to the post-development runoff peaks. Specifically, in Yarmouth Yards, half the runoff flows to Kettle Creek and the other half to Catfish Creek. Stormwater management ponds are built at the subdivision's outlet locations, and each industry also creates internal ponds. These ponds, acting together, treat quality and quantity by settling solids and detaining flows, thereby mitigating peak flows that occur after precipitation events. It is essential to highlight that no industrial process flows, drains, or cooling water are allowed to flow into stormwater drains. The third type is wastewater, which in an industrial setting consists of flows from within factories, including domestic, cooling tower replacement, and process flows. All three wastewater flows must meet stringent St. Thomas and Provincial standards before leaving the property and entering the municipal sewers. These flows are tested frequently and, if necessary, must be pretreated to remove contaminants. Please find more information regarding wastewater in St. Thomas and the Dalewood Wastewater Reclamation Facility Project. Stormwater and wastewater systems are often misunderstood, and we’d like to help support a well-informed community by sharing some additional information and resources.  StormwaterIn Ontario, stormwater management on industrial sites is designed to prevent contamination before it happens, contain it if it does, and ensure nothing harmful ever leaves the property without proper treatment. Think of it as a layered safety net — part engineering, part environmental stewardship, part ongoing vigilance. These systems are built quietly into the landscape, often unnoticed, yet they play a crucial role in protecting rivers, wetlands, farmland, and the people who depend on them. In St. Thomas, industrial stormwater management follows the same philosophy: plan well, stay prepared, and never let runoff flow freely without understanding where it’s going or what it carries. Below is a clearer look at how that works, framed for the realities of our region.
The Core Principle: “Clean Water In, Clean Water Out” At the heart of every stormwater system is a deceptively simple promise: water should leave a site as clean as it arrived. But achieving that promise takes a lot more than a ditch and a drain. Picture a summer rainstorm rolling across an industrial site — droplets landing on rooftops, equipment yards, parking lots, and loading areas. Left unmanaged, that water could sweep up bits of sediment, traces of fuel, dust from materials, or anything else left on the surface. In nature, rain filters itself slowly through soil and vegetation; on paved industrial and residential land, that luxury doesn’t exist. So, Ontario’s system steps in to recreate the natural checks and balances. Stormwater is guided deliberately — slowed down, redirected, and encouraged to settle. Along the way, it passes through structures that separate out grit and oil, ponds that hold it long enough for sediment to drop, and vegetated channels that mimic the cleansing power of wetlands. If anything unexpected happens — a spill, a leak, a sudden contamination — valves can close, chambers can isolate flow, and the water can be held safely in place until it’s dealt with properly. The goal isn’t just to manage a rainfall event. It’s to ensure that every drop of water leaving the site is safe for the next place it travels — whether that’s a municipal system, a creek, or a habitat downstream. Stormwater management on industrial lands isn’t passive. It’s quietly active, always ready, always planning for the “what if” once-in-a-century precipitation event. And in a growing community like St. Thomas, where industry and natural spaces live side by side, that principle — clean water in, clean water out — guides every design and every decision. Ontario’s Legal Framework: Rules That Protect the Land and the People Behind every stormwater pond, culvert, or treatment system is a thick stack of regulations — but at their heart, these rules tell a simple story: water is shared, and protecting it is a collective responsibility. When an industrial site is built in Ontario, nothing involving water is left to chance. Long before the first shovel hits the ground, engineers, environmental specialists, and regulators map out where water will land, where it will travel, and what it might encounter along the way. The goal is to build a system that is both predictable in good weather and prepared for surprises in bad weather. And because stormwater eventually flows into the same rivers, wetlands, and municipal systems the rest of us rely on, the province sets strict standards for how it must be managed. These aren’t suggestions — they’re legal requirements that guide every decision. Here’s how that framework takes shape: ✔ Ontario Water Resources Act (OWRA) The story begins with the OWRA, which treats water as a shared public resource. It requires that:
✔ Environmental Compliance Approvals (ECAs) This is where industrial stormwater management becomes both highly technical and deeply collaborative. In Ontario, no industrial site can operate without an Environmental Compliance Approval, or ECA — a formal authorization from the Ministry of the Environment, Conservation and Parks (MECP). An ECA is more than permission; it’s a blueprint for how water must be handled, monitored, and protected. It spells out:
But St. Thomas has a unique role in this story — one that reflects both trust and technical capability. The Transfer of Review: How St. Thomas Helps Protect Local Waters In St. Thomas, ECAs for stormwater management ponds can be approved through a Transfer of Review process. That means the city reviews and approves stormwater pond designs on behalf of the province — but with the same standards and rigour MECP would apply. This process works because:
In other words, while the province sets the rules, St. Thomas carries the responsibility of ensuring those rules are met, and often exceeded, right here at home. The ECA process, whether handled directly by MECP or through St. Thomas’ Transfer of Review, serves as a checkpoint and a safeguard. It ensures that, before any industrial site begins operation, its stormwater plan is not only engineered but also regulated, reviewed, and fully aligned with Ontario’s environmental standards. ✔ Municipal Engineering Standards & Sewer Use Bylaws Cities like St. Thomas add another layer:
These local rules ensure industrial sites fit responsibly into the communities around them. The framework can seem technical, but its purpose is human: to protect drinking water, farmland, natural habitats, and the health of the people who call our community home. Everything that happens on an industrial site is governed by the understanding that water flows beyond property lines — and so does responsibility. REFER TO Design guidelines here: Consultant Resources - City of St. Thomas  Engineering Controls: The Built-in Safeguards That Keep Water Clean If the legal framework is the rulebook, then the engineering controls are the tools, the physical systems that quietly work in the background, rainstorm after rainstorm, to keep Ontario’s water clean. These features are woven into the landscape of every industrial site, often unnoticed by anyone passing by. Yet they form one of the strongest lines of defence against contamination. Imagine an industrial yard during a heavy summer downpour. Water moves quickly across pavement and concrete, picking up speed in ways it never would on a natural forest floor. Without guidance, that water could carry sediment, metals, oils, or chemicals into places they don’t belong. So Ontario’s stormwater infrastructure does what nature would do — slow the water, settle it, filter it, and hold it — only with the precision of engineered systems. Every industrial site in Ontario must prevent contamination and protect downstream water, but the specific tools used can vary widely depending on the site’s size, layout, activities, soil type, risk level, and municipal requirements. Stormwater management is not a one-size-fits-all solution — it’s more like building a customized toolkit. Most sites will use several of the controls outlined below, but not necessarily all of them. The final design is chosen based on what the site needs to meet provincial and municipal standards. These controls are designed to function together, each layer supporting the next, creating a resilient safety net. Here’s how they work: Stormwater Management Ponds (Dry, Wet, or Hybrid) These ponds are the quiet giants of stormwater management. They’re designed to take in large volumes of runoff and hold it long enough for nature to do its work. Stormwater Management (SWM) Ponds:
Oil-Grit Separators (OGS) Often hidden underground, these chambers are some of the hardest-working pieces of equipment on any industrial site. They:
Spill Containment Structures Industrial sites plan not only for the expected, but for the unexpected. That’s why engineered spill containment is built directly into stormwater systems. These features include:
Vegetated Swales and Filter Strips These green features bring nature back into the industrial landscape. They:
Underground Storage Chambers When intense storm events overwhelm surface systems, underground chambers provide critical backup. They:
Pretreatment Systems for Specialized Industrial Processes If a facility handles materials that could affect water quality, additional pretreatment systems are required. These may include:
Together, these engineering controls create a layered approach — like a series of checkpoints water must pass through before it leaves the site. Each control adds protection, stability, and certainty, ensuring that what flows beyond the property line is safe for the community and the natural world. Source Control: Protecting Water Before It Ever Touches the Ground If stormwater ponds, separators, and underground chambers are the safety net, then source control is the part of the system that works to ensure the net is never needed. It’s the quiet, everyday work of preventing pollution before the rain arrives — long before water begins its journey across an industrial site. In many ways, source control is the most human part of stormwater management. It depends not just on engineering, but on habits, procedures, and planning. It’s where environmental protection becomes part of the daily rhythm of an industrial operation. Picture a facility yard at the end of a long workday. Equipment is stored properly. Materials are covered. Waste bins are closed. Chemical drums sit inside secondary containment. Staff have done their final checks. When the rain falls later that night, the site is ready — not because of a single piece of infrastructure, but because of dozens of small decisions that prevent pollutants from ever entering the stormwater system. Stormwater safety starts with preventing contamination at the source:
Source control:
Monitoring & Reporting: The Ongoing Work of Keeping Water Safe Even the most carefully designed stormwater system isn’t considered complete once construction wraps up. In Ontario, stormwater management is not a “build it and forget it” process; it’s a continuous cycle of observation, measurement, maintenance, and reporting. This is where compliance becomes a lived practice, not just a set of engineering drawings on a shelf. Consider a quiet spring morning after a heavy overnight rainfall. The stormwater pond has done its job, holding and slowly releasing water. The oil-grit separator is capturing fine sediment below ground. The swales are filtering runoff through their roots. But the story doesn’t end there. Now the real work begins by checking that every part of the system performed exactly as it was designed to. Monitoring and reporting turn stormwater management from a static design into a dynamic, responsive system — one that adapts to weather, wear, and real-world conditions. Here’s how that looks in practice:
Stormwater management isn’t just about what happens during a rainstorm — it’s also about what happens afterward. Monitoring and reporting ensure that:
In a growing city like St. Thomas, where industrial development and environmental protection go hand in hand, monitoring becomes the quiet assurance that the system is doing precisely what it should: guarding the watershed day after day, storm after storm. Protection of Local Ecosystems: Where Every Drop of Water Eventually Arrives Every stormwater system, no matter how engineered, ends with the same truth: all water goes somewhere. It travels through ponds and pipes, moves through soil and root systems, and eventually finds its way into something larger — a creek, a municipal drain, a wetland, or a river. These waterways are living systems. They support fish, birds, insects, and plants. They feed the farmland. They replenish groundwater. They are part of the natural heritage that communities like St. Thomas depend on and cherish. Stormwater management exists not just to protect a single site, but to protect everything downstream from it. Picture the Norman Drain, Kettle Creek, or any of the waterways that carve their quiet paths through Elgin County. A storm in the industrial park eventually becomes a ripple here — and long before that ripple arrives, the stormwater system has already worked to ensure it carries no harmful surprises. This is why Ontario’s stormwater rules are so strict, and why the systems built into industrial sites look more like environmental guardians than simple infrastructure. Here’s how stormwater management protects the ecosystems and natural landscapes beyond the property line: Clean Water Leaving the Site Means Safe Habitat Downstream Stormwater treatment ensures that:
Controlled Flow Prevents Erosion and Flooding Unmanaged runoff can be powerful — strong enough to carve new channels, damage habitat, or wash away spawning beds. Stormwater systems protect ecosystems by:
Sediment Control Preserves Water Quality Sediment may seem harmless, but too much can smother fish eggs, clog gills, and bury aquatic vegetation. Stormwater systems help prevent this by:
Wildlife Corridors and Naturalized Areas Thrive Near Well-Managed Sites Stormwater ponds and vegetated areas often double as small pockets of habitat. These spaces—when properly designed and maintained—can:
Municipal and Provincial Oversight Ensures Long-Term Protection Environmental protection doesn’t end when a stormwater system is built. Ongoing oversight ensures:
Why Ecosystem Protection Matters for St. Thomas Our region’s waterways don’t just support wildlife — they support people. They provide:
Stormwater management is one of the quiet ways we ensure that industry, nature, and neighbourhoods can grow side by side — each strengthening the other, not threatening it. A System Built to Protect What Matters Most When you step back and look at the whole picture, stormwater management in Ontario is far more than a collection of ponds, pipes, and engineering drawings. It is a carefully layered system — shaped by regulation, guided by science, and strengthened by everyday practices on the ground. At its core, the system is built to do five things exceptionally well:
Together, these layers form a resilient framework that allows industrial growth and environmental protection to coexist — not in conflict, but in partnership. This is the quiet infrastructure that makes it possible for communities like St. Thomas to welcome new employers, diversify the local economy, and support significant investments while staying true to the landscapes and waterways that define our region. It means our rivers continue to run clear, our wildlife can thrive, and downstream ecosystems remain protected no matter how the city grows. Stormwater management may not always be visible, but its impact is everywhere — in every clean creek, every stable wetland, and every piece of land downstream that stays healthy and resilient. It is one of the essential ways we ensure the St. Thomas of tomorrow remains as vibrant, sustainable, and connected to nature as the St. Thomas we cherish today. Now, who wants to keep learning about our water systems? Wastewater is up next! Stay tuned!
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