How NJ Stormwater Management Works at Every Scale

Most people in New Jersey only think about stormwater when their basement floods, their parking lot ponds, or their road washes out. By then the problem is already past the point where the design choices that mattered have been made. Stormwater management is the discipline of making those choices on purpose — deciding ahead of time where the water will go when several inches of rain arrive in a few hours, and engineering the property to absorb, slow, store, or convey it without damaging the building, the lot, the neighbor, or the receiving stream.

The mechanics are the same whether the property is a quarter-acre residential lot, a 12-acre commercial development, or a 20-square-mile municipality. The scale changes, the regulatory exposure changes, and the engineering tools change — but the underlying physics doesn’t. Rain falls on impervious surface, the surface doesn’t absorb it, and the water has to go somewhere. Stormwater management is the engineered answer to where.

This post covers stormwater management at three scales: the residential property, the commercial or HOA-scale site, and the municipality. Each scale has its own regulatory framework, its own engineering toolkit, and its own failure modes. The three scales are also interlocking — a residential downspout tied illegally into a sanitary sewer doesn’t just flood a basement, it contributes to combined sewer overflow miles downstream. Understanding all three is how a property owner, board, or municipal stormwater coordinator makes decisions that hold up under the storms New Jersey gets.

Stormwater Management vs. Drainage: They’re Not the Same Thing

In casual conversation the two terms are used interchangeably. Technically they’re not. The distinction matters because it determines which body of regulation applies, which engineering standards govern the design, and which professionals can legally sign off on the work.

Drainage is the movement of water off a defined surface — a roof, a yard, a driveway, a parking lot, a road. The engineering question is local: where is the water now, and how does it leave this surface without causing damage? Residential yard drainage, French drains, footing drains, channel drains, gutters, and downspouts are all drainage. The yard-drainage post on this site covers the residential drainage layers in detail and is the homeowner-scale companion to this piece — the NJ Homeowner’s Guide to Yard Drainage is where to start if the immediate problem is water against the foundation or a soggy lawn.

Stormwater management is the engineered control of runoff at the scale where it leaves the property and enters something larger — a stream, a wetland, a regional drainage system, or a municipal storm sewer. The engineering question is systemic: how much water leaves this site, how fast, how clean, and what happens to it downstream? Stormwater management addresses runoff quantity, quality, and groundwater recharge — three distinct performance standards that drainage doesn’t have to think about.

The two disciplines overlap, especially at the residential scale where the same physical system (a French drain, for example) does both jobs at once. The distinction sharpens as the property gets larger and the regulatory threshold gets crossed.

Why New Jersey’s Stormwater Problem Is Structurally Hard

Stormwater management is harder in New Jersey than in most states for reasons that stack:

Clay-heavy soils. Much of central and northern New Jersey sits on glacial till and silty clay subsoils that hold water rather than infiltrate it. The state’s soil survey shows large portions of Middlesex, Somerset, Union, and Essex counties with hydrologic soil group C and D classifications — soils that produce significant runoff even from moderate rainfall. Engineered infiltration practices that work well in sandy New Jersey shore communities don’t work the same way in clay-dominated inland counties without substantial modification.

Aging and combined sewer infrastructure. Twenty-one New Jersey municipalities, including Newark, Jersey City, Paterson, Camden, and Trenton, still operate combined sewer systems that carry sanitary waste and stormwater in the same pipe. During heavy rain, those systems overflow into rivers and bays by design — these are the combined sewer overflows (CSOs) that drive much of NJDEP’s stormwater regulatory effort. Even municipalities with separated systems often have aging stormwater conveyance that was sized for rainfall patterns of decades ago, not the rainfall patterns the state is seeing now.

Increasing rainfall intensity. The Northeast U.S. has experienced a documented increase in extreme precipitation events over the last several decades, and New Jersey is squarely within that pattern. The 100-year storm of 1970 produces less rainfall than the 100-year storm of today. Stormwater systems designed and built to older rainfall frequency atlases are routinely overwhelmed by storms that the system is technically still rated for, because the underlying rainfall data has shifted. NJDEP’s 2023 Inland Flood Protection Rule was an explicit regulatory response to this, requiring updated rainfall data and adding climate-adjusted design storms to the standards developers must meet.

High impervious cover in dense corridors. The 130-mile NJ Turnpike corridor and the Northeast Corridor rail line have driven decades of dense suburban and commercial development along a band of the state where stormwater has nowhere to go. In the most-developed parts of Middlesex, Union, Hudson, and Essex counties, 40% or more of land surface is impervious. Pre-development hydrology has been replaced by drainage networks that move water off-site as fast as possible — which means peak runoff arrives at receiving streams faster and higher than the streams were shaped by, producing the bank erosion and downstream flooding that NJDEP’s water quantity standards are designed to prevent.

These four factors mean a stormwater system in New Jersey can’t be borrowed from a textbook designed for a different region. The engineering has to account for the specific soil, the specific rainfall, the specific receiving system, and the specific regulatory environment.

The Regulatory Framework: NJDEP, MS4, and Municipal Ordinances

Stormwater regulation in New Jersey is layered. A property owner, developer, or municipal official navigating it needs to understand four interlocking pieces:

N.J.A.C. 7:8 — the Stormwater Management Rule. This is the foundational state regulation, administered by NJDEP, that defines what stormwater management is, who has to do it, and what performance standards apply. The full rule is available on the NJDEP stormwater website, and a plain-language overview of the rule’s history and amendments is maintained on the New Jersey stormwater management rules Wikipedia entry. The rule was substantially amended in 2021 to require green infrastructure for the majority of new development, and amended again in 2023 to incorporate climate-adjusted design storms under the Inland Flood Protection Rule.

The “major development” threshold. The rule applies to “major development,” defined as any development that disturbs one or more acres of land or increases impervious surface by one-quarter acre (10,890 square feet) or more. A single-family home addition is rarely major development. A commercial parking lot expansion routinely is. The threshold is the trigger that pulls a project from “drainage” into “stormwater management” in regulatory terms.

The MS4 permit program. Municipalities, the New Jersey Department of Transportation, NJ Turnpike Authority, county governments, and large publicly-owned complexes (universities, hospitals, prisons) operate Municipal Separate Storm Sewer Systems — MS4s — and discharge stormwater under NJPDES permits issued by NJDEP. The current Tier A MS4 permit took effect January 1, 2023, and consolidated what was previously a two-tier system (Tier A for urban/coastal municipalities, Tier B for smaller rural municipalities) into a single Tier A standard. All 565 New Jersey municipalities are now subject to the same baseline stormwater obligations.

Municipal stormwater control ordinances. Each municipality is required to adopt a stormwater control ordinance that implements N.J.A.C. 7:8 locally. New Jersey is a home-rule state, which means municipalities can adopt more stringent standards than NJDEP requires, but not less stringent. Some municipalities lower the major-development threshold (for example, from one acre to one-half acre of disturbance), or add requirements for impervious surface caps, tree replacement, or stormwater fees. The applicable ordinance is the municipal one — NJDEP sets the floor, the municipality sets the actual rule.

A few practical implications follow from this structure. A residential homeowner doing routine maintenance never crosses the regulatory threshold and is governed almost entirely by drainage best practices and municipal building code. A commercial developer triggers N.J.A.C. 7:8 the moment the project crosses the impervious surface or disturbance threshold and is subject to engineered stormwater design with NJDEP-approved best management practices. A municipal stormwater coordinator is operating under the MS4 permit at all times, with annual reporting obligations, mandated training, and enforcement authority over private properties within the municipality.

Residential-Scale Stormwater Management

At the single-family residential scale, most properties never trigger N.J.A.C. 7:8. The relevant framework is municipal building code, the municipal stormwater control ordinance for any work that does cross the threshold, and the practical drainage layers that protect the foundation and the basement.

When Residential Crosses Into Stormwater Territory

Most homeowner work stays in the drainage lane. The threshold conditions that pull a residential property into stormwater management are:

• A major addition or new construction that adds more than a quarter-acre of impervious surface (10,890 square feet — roughly the footprint of a large house plus driveway plus accessory structures combined). Most single-family additions don’t approach this; large estate-scale projects can.
• Subdividing a lot for new construction. Once the lot is being developed rather than just modified, the development is governed by the local stormwater ordinance regardless of the individual building footprint.
• A municipal ordinance with a lowered threshold. Some New Jersey municipalities have reduced the major-development threshold below the state minimum. In those towns, work that wouldn’t be regulated under N.J.A.C. 7:8 may still trigger stormwater design review locally.
• A property in a designated stormwater management planning area or with a known downstream impairment, where additional review applies.

For the majority of homeowners, the work that matters most isn’t regulatory — it’s the layered drainage defense that protects the foundation from the runoff the property already produces. That layering is covered in detail in the NJ Homeowner’s Guide to Yard Drainage, which walks the system from roof through yard, foundation, sump pump, backup power, and backwater valve. The sequel piece on what a whole-house generator actually protects in a NJ storm covers the power-resilience layer that keeps the system running when the grid fails. And the sewer backup guide covers what happens when the municipal sewer system fails upstream of an individual property — a failure mode that no amount of residential drainage can prevent, only a backwater valve can.

The Residential-to-Municipal Interface

Even properties below the regulatory threshold contribute to the municipality’s stormwater load, and the interface is where most homeowner-level stormwater problems get created or solved. The most consequential examples:

Downspout discharge. Where residential roof runoff ends up determines whether the homeowner is helping or hurting the municipal system. Discharge to a vegetated yard with infiltration potential reduces the municipal load. Discharge to a paved driveway that runs to the street pushes water into the municipal storm sewer at peak rate. Discharge tied directly into the sanitary sewer lateral (an “illegal tie-in,” common in older NJ homes) sends stormwater into the wastewater system, where it contributes directly to sanitary sewer overflows during heavy storms.

Driveway and patio expansions. Each square foot of impervious surface added to a residential lot is a square foot that no longer infiltrates. Across thousands of homes in a municipality, accumulated residential impervious cover meaningfully affects the watershed.

Yard grading toward the right-of-way. Lots that drain to the public street effectively use the municipal storm drain as the property’s stormwater system. Lots that drain to the rear, into a vegetated swale, or into a dry well on-property reduce the load on the municipal network.

Cumulative downstream effect. An individual homeowner’s choices look small at the property scale. The same choices repeated across a development of 200 homes produce stormwater volumes that municipal infrastructure may or may not be sized to handle. The cumulative effect is real and is why municipal stormwater ordinances regulate even relatively minor residential impervious surface increases in some jurisdictions.

Practical Residential Stormwater Practices

For residential properties below the regulatory threshold, the practical stormwater toolkit includes:

• Disconnecting downspouts from any sanitary sewer tie-in. If older NJ homes have downspouts that disappear into the ground and connect to the sewer lateral, redirecting them to a vegetated discharge area or a dry well is one of the single highest-impact stormwater changes a homeowner can make.
• Rain gardens. A shallow, planted depression that captures roof runoff and lets it infiltrate slowly. Sized properly for the contributing roof area and the soil’s actual infiltration rate, a rain garden can absorb most of the runoff from a typical storm.
• Dry wells. A buried perforated chamber that holds roof discharge and lets it infiltrate. Works well in sandy soils. Needs to be substantially oversized in clay soils, or it functions as a buried bathtub that overflows back to the surface.
• Permeable pavers. For driveways, walkways, and patios, permeable paving allows water to infiltrate through the surface rather than running off. More expensive than conventional paving, but reduces both runoff volume and the load on every downstream layer.
• Bioswales. A shallow vegetated channel that conveys water across the property while allowing infiltration along the path. Useful for lots with a natural drainage corridor that can be shaped and planted.
• Foundation grading and discharge management. The foundation-level work covered in the yard drainage post — proper grading, downspout extensions, French drains tied to a discharge point that actually moves water off-property — is the residential drainage layer that stops water from reaching the foundation in the first place.

For homeowners in flood-prone areas, the combination of property-scale stormwater management (rain garden, dry well, downspout redirect) and the backwater-valve plus sump pump defense covered in our sewer backup guide is what holds during major events. Neither one is sufficient alone.

Commercial and HOA-Scale Stormwater Management

Commercial properties, multi-family developments, apartment complexes and homeowners’ association common areas are where stormwater management as a regulated discipline lives. Most commercial development crosses the N.J.A.C. 7:8 major-development threshold the moment the parking lot is sized for the building. From that point forward, the project is subject to engineered stormwater design, NJDEP and municipal permitting, a deed notice recording the stormwater management measures, and ongoing maintenance obligations that persist for the life of the property.

What the Regulation Requires

For a project that triggers N.J.A.C. 7:8, the engineered design must meet three performance standards on each on-site drainage area:

Stormwater runoff quantity. Post-construction peak runoff rates for the 2-year, 10-year, and 100-year storms must not exceed pre-construction rates, or the design must demonstrate through hydrologic and hydraulic analysis that no increase in peak rates and no increase in downstream flood damage will occur. The 2023 Inland Flood Protection Rule added climate-adjusted rainfall data for the design storms, which has the practical effect of requiring larger detention than the same site would have needed under the pre-2023 standard.

Stormwater runoff quality. Post-construction loading of total suspended solids (TSS) in stormwater runoff must be reduced by 80% on an annual average basis. This is the standard that requires water quality treatment — typically through vegetated treatment systems, manufactured treatment devices, or both. The water quality design storm is 1.25 inches of rainfall in 2 hours.

Groundwater recharge. The post-construction site must maintain pre-construction groundwater recharge on an annual basis, or the post-construction infiltration volume must be increased to compensate for the loss from new impervious surface. This is the standard that drives the green infrastructure requirement — designs that infiltrate runoff on-site, rather than detaining and releasing it, are how the recharge standard gets met.

The 2021 rule amendment made green infrastructure the default approach for meeting these standards. A project can use non-green-infrastructure measures (conventional detention basins, manufactured devices) only where green infrastructure is demonstrated to be infeasible, with documentation.

The Engineering Toolkit

The full range of NJDEP-approved best management practices is documented in the New Jersey Stormwater Best Management Practices Manual. The practical toolkit a commercial site uses in central New Jersey includes:

• Bioretention basins and rain gardens. Vegetated, soil-media-filled basins that capture runoff, treat it through filtration and biological uptake, and either infiltrate it or discharge cleaned water to a downstream system. Green infrastructure, treats both water quality and recharge.
• Infiltration basins. Larger, deeper basins designed primarily to infiltrate runoff back into the ground. Effective where soils permit — limited utility on the clay-heavy soils that dominate central NJ unless the site has localized sandy lenses.
• Wet ponds and constructed wetlands. Permanent pool-of-water systems that treat runoff through settling and biological processes. Used for larger commercial sites and HOA common areas.
• Detention basins. Dry storage basins that hold runoff temporarily and release it at a controlled rate. The workhorse of pre-2021 NJ stormwater design, still used heavily, often combined with green infrastructure features for water quality.
• Underground detention systems. Buried chambers (plastic arches, concrete vaults, oversized pipe) that store runoff under parking lots or other paved areas. Used where above-ground basin space isn’t available — common on tight commercial sites in dense corridors.
• Permeable pavement. Asphalt, concrete, or paver surfaces designed to allow water to infiltrate through the surface and into a stone reservoir beneath. Treats runoff at the source.
• Manufactured treatment devices (MTDs). Engineered hydrodynamic separators, filter cartridges, and similar pre-fabricated water-quality devices that meet TSS removal standards verified by the New Jersey Corporation for Advanced Technology (NJCAT). Used where space for green infrastructure isn’t available.
• Conveyance. The pipe, channel, and inlet network that moves water through the site to the treatment and detention systems. This is where excavation and underground utility work — including horizontal directional drilling for routing pipe beneath existing infrastructure — intersects with stormwater design.

Post-Construction Maintenance Obligations

The piece commercial property owners and HOAs most often underestimate is the maintenance obligation that attaches to the stormwater system after construction is complete. NJDEP requires that a maintenance plan be recorded as a deed notice on the property, and the responsibility runs with the deed.

The plan typically requires:

• Annual inspections of all stormwater management measures by a qualified individual
• Routine maintenance — vegetation management, sediment removal, debris clearing, structural inspection
• Repair and reconstruction as needed
• Recordkeeping documenting all inspections and maintenance, available for municipal inspection on request

A failed detention basin is not just a hydraulic problem — it’s a regulatory exposure. Municipalities have authority under their MS4 permits to inspect privately-owned stormwater facilities and enforce maintenance obligations. A bioretention basin choked with sediment, a detention basin with a failed outlet structure, or a manufactured treatment device that hasn’t been serviced in years can result in municipal enforcement action and personal liability for the property owner or HOA board.

For HOAs in particular, this is often the unwelcome discovery: the detention pond the developer left in the common area twenty years ago is the HOA’s responsibility now, the maintenance schedule was lost, and the system is silting in. Bringing it back into compliance requires a current inspection, a sediment removal plan, vegetation restoration, and sometimes structural rehabilitation. The cost is real and the obligation is non-negotiable.

When Commercial Drainage Becomes a Stormwater Problem

Even on commercial properties where the original development pre-dates current regulation, drainage failures often become stormwater problems quickly. The common patterns:

• Parking lot ponding. An aging parking lot with failed inlets or settled grades produces standing water that doesn’t drain. The water is both a liability hazard and a sign that the conveyance system is no longer working. Often fixed with re-grading, inlet rehabilitation, and re-paving — sometimes with permeable surfaces installed during the rebuild.
• Detention basin failure. A basin that no longer drains within the design drawdown time (typically 72 hours) is no longer providing the water quality function it was built for. The fix usually involves outlet structure rehabilitation, sediment removal, and re-establishing the vegetated bottom.
• Trench drain and channel drain failures. Loading docks, drive-throughs, and entrance areas often rely on linear drains that clog, settle, or break. Replacement involves saw-cutting, excavation, and reconnection to the conveyance system.
• Underground conveyance failures. Buried storm sewer that cracks, collapses, or fills with sediment produces backups, sinkholes, or ponding upstream. CCTV inspection identifies the failure point; repair typically requires excavation or trenchless replacement methods similar to those used on sanitary sewer.

This is the lane where Arrow’s commercial excavation, drainage, and underground utility work intersects with stormwater systems. The work isn’t always classified as “stormwater management” in the regulatory sense — much of it is conveyance maintenance and repair — but the function is the same, and the system has to keep performing for the property to remain in compliance with the post-construction maintenance plan.

Municipal-Scale Stormwater Management

At the municipal scale, stormwater management is no longer a property-level engineering question — it’s a public infrastructure management discipline under federal Clean Water Act authority, delegated through NJDEP via the MS4 permit program. Every New Jersey municipality is now operating under the consolidated Tier A permit that took effect January 1, 2023, with the same baseline obligations regardless of size or geography.

What the MS4 Permit Requires

The current Tier A MS4 permit requires municipalities to develop and implement a Stormwater Pollution Prevention Plan (SWPPP) that addresses the following core program areas:

• Post-construction stormwater management. Adopting and enforcing a municipal stormwater control ordinance that meets or exceeds N.J.A.C. 7:8, reviewing major development applications, and tracking compliance with post-construction maintenance plans.
• Public education and outreach. Educating residents, businesses, and contractors about stormwater impacts and best practices.
• Illicit discharge detection and elimination (IDDE). Identifying and eliminating non-stormwater discharges into the municipal storm sewer system, including illegal sanitary tie-ins, industrial discharges, and dumping.
• Construction site stormwater runoff control. Reviewing and inspecting construction projects for erosion and sediment control during the active construction phase.
• Pollution prevention/good housekeeping. Managing municipal operations to minimize stormwater pollution — street sweeping, catch basin cleaning, salt storage practices, vehicle maintenance, parks and grounds management.
• Mapping the MS4. Maintaining a current map of the municipal storm sewer system, including outfalls, conveyance, and connected facilities.
• Outfall inspection. Inspecting all MS4 outfalls and screening for dry-weather flow that indicates illicit connections.
• Annual reporting and certification. Submitting an annual report to NJDEP demonstrating compliance with permit conditions, with certification by a designated Stormwater Program Coordinator.

The 2023 permit added or strengthened several requirements that were not in the prior permits, including stricter ordinances on private salt storage, tree removal and replacement, pet waste, wildlife feeding, yard waste, and improper waste disposal. Municipalities transitioning from the prior Tier B classification face the heaviest compliance lift, since most of these elements were not part of their previous program.

The Public Infrastructure Side

Beyond the regulatory program, the MS4 itself is physical infrastructure — pipes, inlets, manholes, outfalls, detention basins, and conveyance channels — that the municipality owns and operates. The maintenance and rehabilitation of that infrastructure is a continuous capital and operating obligation, with the work falling broadly into:

• Routine maintenance. Catch basin cleaning, inlet repair, street sweeping (which removes sediment before it enters the storm sewer), and basic conveyance maintenance.
• System mapping and condition assessment. Inventory of the MS4, CCTV inspection of pipe condition, hydraulic capacity analysis to identify undersized segments.
• Capital rehabilitation. Replacement of failed conveyance, retrofit of inadequate detention, installation of green infrastructure to reduce loads on the gray infrastructure, separation of combined sewers where applicable.
• Emergency response. Sinkhole repair, blocked-conveyance response during storms, post-storm debris and damage assessment.

Most New Jersey municipalities partner with civil engineering firms for design and inspection, and with contractors for the physical construction and maintenance work. For underground stormwater conveyance specifically, work often involves the same underground utility skills used for sanitary sewer — excavation, trenchless replacement, and where conditions require it, horizontal directional drilling beneath roadways, intersections, and other surface features that can’t be opened with conventional trench excavation.

The Homeowner-Municipal Interface

FAQs About Stormwater Management in NJ

What’s the difference between stormwater management and drainage?

Drainage moves water off a defined surface — a roof, a yard, a parking lot — and is the local engineering of where water goes immediately after it lands. Stormwater management is the regulated control of runoff at the scale where water leaves a property and enters something larger, like a stream, wetland, or municipal storm sewer. Stormwater management addresses runoff quantity, water quality, and groundwater recharge, which drainage doesn’t have to address.

Does residential work trigger NJ stormwater regulations?

Rarely. N.J.A.C. 7:8 applies to “major development,” defined as one acre or more of land disturbance or a quarter-acre or more of new impervious surface. Most single-family residential work doesn’t approach these thresholds. Some municipalities have adopted lower thresholds, so the applicable rule is the municipal stormwater control ordinance, which can be more stringent than the state minimum.

What’s the MS4 permit and does it apply to my property?

The MS4 (Municipal Separate Storm Sewer System) permit is an NJDEP-issued permit that authorizes municipalities, NJDOT, county governments, and large publicly-owned complexes to discharge stormwater. The permit applies to the municipality (or the highway agency, or the public complex), not directly to individual property owners — but the municipality’s permit obligations require it to enforce stormwater ordinances and address illicit connections on private property within its jurisdiction. Indirectly, the MS4 permit reaches every property in the state.

Are all NJ municipalities still classified as Tier A and Tier B?

No. As of the 2023 permit, the prior Tier B classification was eliminated and all 101 formerly Tier B municipalities were reassigned to Tier A. There is now a single consolidated Tier A permit covering all New Jersey municipalities, plus separate permits for highway agencies and large public complexes.

What is green infrastructure and is it required?

Green infrastructure refers to stormwater management practices that manage runoff at or near its source through infiltration, evapotranspiration, and capture for reuse — rain gardens, bioretention basins, permeable pavement, infiltration practices, vegetated swales. NJDEP’s 2021 amendment to the Stormwater Management Rule made green infrastructure the default approach for new major development. Non-green-infrastructure measures can be used only where green infrastructure is demonstrated to be infeasible.

What’s the Inland Flood Protection Rule?

The Inland Flood Protection Rule, effective July 17, 2023, updated NJDEP’s flood hazard regulations to incorporate climate-adjusted rainfall data and require new development to be designed for storm events larger than the previously-applicable 100-year storm. The practical effect is that stormwater detention systems designed under the new rule are sized larger than they would have been under the pre-2023 standard.

Who’s responsible for maintaining a stormwater detention basin on a commercial property or HOA?

The property owner. NJDEP requires a stormwater maintenance plan to be recorded as a deed notice on the property, and the maintenance obligation runs with the deed. For HOAs, the basin or stormwater facility located in common areas is the HOA’s responsibility. Annual inspection, routine maintenance, and recordkeeping are required. Municipalities have authority under their MS4 permits to inspect and enforce.

What’s the 80% TSS removal standard?

The N.J.A.C. 7:8 water quality standard requires that post-construction stormwater management measures reduce the load of total suspended solids (TSS) in runoff by 80% on an annual average basis. The standard is met through engineered treatment practices — bioretention, vegetated systems, manufactured treatment devices verified by NJCAT — installed as part of the site stormwater management design.

Can I redirect my downspout into the municipal storm sewer?

In most cases yes, if local code allows direct connection. The municipal storm sewer is sized to receive stormwater. What’s prohibited in most New Jersey municipalities is connecting the downspout to the sanitary sewer lateral, which sends stormwater into the wastewater system and contributes to sanitary sewer overflows. Older NJ homes sometimes have illegal sanitary tie-ins that should be redirected.

What does a stormwater contractor do?

The work varies by scale. At the residential level: yard drainage installations, sump pump systems, foundation drainage, downspout management, rain gardens, dry wells. At the commercial and HOA level: detention and bioretention basin construction and rehabilitation, manufactured treatment device installation and service, underground conveyance and detention, parking lot drainage retrofits, post-construction maintenance work. At the municipal level: storm sewer maintenance, conveyance replacement, sinkhole and inlet rehabilitation, trenchless replacement of failed underground conveyance.

Schedule a Stormwater Assessment

Call (908) 595-1597 or request an estimate to schedule a stormwater assessment.

For residential drainage issues, the assessment walks the property and identifies the layered defense from roof to backwater valve. For commercial and HOA properties, the assessment reviews the existing stormwater system against the recorded maintenance plan and identifies compliance gaps and rehabilitation priorities. For municipal projects, the assessment scopes the conveyance, structural, or excavation work in coordination with the municipal engineer.