Who Fixes a Drainage Problem: Excavator, Landscaper or Plumber?

Who you call for yard drainage problems depends on where the water is going wrong. Call a plumber for sewer backups and anything piped into a sewer. Call an excavating contractor for regrading, French drains, dry wells, swales and culverts. A landscaper suits small bed fixes, a waterproofer suits a wet basement, and your municipality handles street and stormwater issues.

What you are seeing	Who usually fixes it	Why
Sewage or gray water backing up into floor drains, toilets or tubs	Licensed plumber	Drain and sewer piping is plumbing under Wisconsin law and needs a licensed plumber
Downspouts or a sump line tied into an underground pipe that runs to the sewer	Licensed plumber (the pipe), excavator (the trench and new outlet)	The connection is plumbing; rerouting it to daylight is earthwork
Water running toward the foundation, a lawn that slopes the wrong way	Excavating or grading contractor	Regrading moves soil in volume and needs machines and a laser level
A soggy lawn that never dries, hillside seepage, low spots that hold water for days	Excavating contractor	French drains, catch basins and dry wells mean trenching and buried pipe
Water crossing the driveway, a washed-out ditch or a crushed culvert	Excavating contractor	Ditching and culverts are heavy site work, sometimes with a road-side permit
A flower bed that puddles, mulch washing onto the walk	Landscaper	Small, hand-scale grading and plant choices
Water seeping through basement walls or the floor-wall joint	Basement waterproofing contractor	Interior drain tile, crack repair and sump systems are a specialty trade
Runoff from the street, a neighbor’s new grading, a clogged storm inlet	Your town, village or city	Public stormwater and neighbor disputes are not something a contractor can settle

Drainage problems rarely announce their cause. A wet basement can be a grading problem; a soggy lawn can be a broken downspout pipe. Plain disclosure: LandEx Company is an excavating and site work contractor based in Walworth County, and drainage is one of the services we sell. We have tried to be straight about which jobs belong to someone else.

How do I figure out what is causing my drainage problem?

Before you call anyone, spend one rainy afternoon outside with your phone. Most problems become obvious when you watch the water move.

1. Start at the roof. Watch the gutters during a hard rain. Overflow at the corners, downspouts that dump right at the foundation, or splash blocks that have settled and tipped toward the house are among the most common causes of a wet foundation.
2. Follow the water across the ground. Does it sheet toward the house, collect in one low spot, or run off the neighbor’s lot onto yours? A short video saves a contractor a lot of guessing.
3. Check after the rain stops. Water gone in a few hours is normal. Water standing a day or two later points to compacted soil, heavy clay, a high water table or a low spot with no outlet.
4. Look inside. Wall seepage during rain points to grading and roof water. Water rising through floor drains, especially if it smells, points to the sewer.
5. Note the timing. Problems that appear only during spring thaw, when frozen ground stops snowmelt soaking in, need a different fix than ones that follow every summer storm.

Clay-heavy soil is common in parts of southeast Wisconsin, and it changes the answer. Clay sheds water fast and absorbs it slowly, so a fix that works on sandy ground, like a small dry well, can fill and sit full on clay. Anyone you hire should check your soil before recommending a buried system.

When do I need a plumber instead of a drainage contractor?

Call a plumber first whenever the problem involves the sewer or the pipes that connect to it. That includes sewage coming up through a basement floor drain, gurgling toilets after a storm, a sump pump that runs constantly or has failed, and any underground pipe that carries downspout or sump water into a sanitary or storm sewer.

This is a legal line, not just a skill one. Wisconsin’s plumbing statute, Chapter 145, defines plumbing to include drain and wastewater piping that connects to a sewer main or other terminal, and that work generally requires a plumber licensed through the Department of Safety and Professional Services (DSPS). The same definition carves out rain gutters and downspouts down to the point where they discharge into a plumbing system, a subsoil drain or a foundation drain. The downspout is not plumbing; the pipe it feeds may be.

There is a narrow homeowner exemption. Wisconsin lets the owner of a one-family home they live in do their own plumbing work, unless a local ordinance requires a license. DSPS guidance and several municipal plumbing offices add that the home must be the owner’s primary residence, and that a permit and inspection are often still required, especially for exterior work.

Many Wisconsin communities restrict sending clear water, meaning sump discharge and roof runoff, into the sanitary sewer, because it overloads treatment plants during storms. If your downspouts or sump are tied into a sanitary line, the fix may be a plumber disconnecting it and an excavator giving that water a proper outlet in the yard. Your village or city utility can tell you what its ordinance allows.

What drainage work does an excavating contractor handle?

Anything that means moving a real volume of soil, burying pipe in the yard, or reshaping how water crosses your property is excavation work. On our own drainage and water management page we list the six we do most:

• French drains for chronically wet yards, foundation perimeters and hillside seepage. A gravel-filled trench with perforated pipe collects groundwater and carries it to an outlet.
• Downspout extensions and pop-up emitters that carry roof water underground and release it well away from the house.
• Catch basins and yard drains for low spots that hold standing water after every rain.
• Swales and surface grading that move water across the surface without trenching the whole yard.
• Sump pump discharge lines routed to daylight or a dry well instead of the foundation edge.
• Driveway culverts and ditching that keep gravel in place and water out of the garage.

Dry wells, buried chambers that hold runoff and let it soak in slowly, belong here too. They suit sandier soil far better than tight clay.

Regrading is the job most often handed to the wrong trade. Fixing the slope around a house means bringing in fill, cutting high spots, compacting in lifts and checking with a laser level. Done by eye with a rake, it can look right and still send water back to the foundation. If your problem is the overall shape of the yard, you want someone who does finish grading for a living and owns the equipment for it.

Can a landscaper fix yard drainage?

Sometimes, and for the right job a landscaper is the better call. Small, surface-level fixes inside planting beds, such as re-pitching a bed away from the house, adding a rain garden in a spot that already drains, or choosing plants that tolerate wet feet, are landscaping work.

Where it goes wrong is scale. Once a fix needs a trench longer than a few feet, buried pipe, or more soil than a few wheelbarrow loads, you are into excavation. Some landscaping firms own excavators and do this well; others subcontract it or attempt it by hand. Ask directly who will trench, set grade and bury pipe, and with what equipment. The difference between a drainage contractor and a landscaper is less about the title on the truck and more about the equipment and the experience with grade.

Who fixes water in the basement?

A basement waterproofing contractor handles the inside of the foundation: interior drain tile, sump pits, crack injection and wall sealing. It is sometimes necessary, especially in older homes with failing foundation drains.

But interior waterproofing manages water that has already reached the wall. If the cause is outside, such as downspouts dumping at the corner, a negative slope, or a window well that fills, fixing the outside first is often the cheaper and more lasting answer. Correct roof water and grading first, watch a season of rain, then decide on interior work. If a waterproofing salesperson never looks at your gutters or the grade around the house, get a second opinion.

When should I call the town, village or county?

Call when the water comes from the public side: a street flooding your driveway apron, a clogged storm inlet, a filled-in roadside ditch or a culvert under a public road. Many communities maintain the right-of-way ditch and may require a permit before a driveway culvert in it is replaced.

It is also the right first stop if a neighbor’s regrading has started sending water onto your lot. A contractor can fix your side, not settle the dispute.

Can I redirect water onto my neighbor’s property in Wisconsin?

Not if it causes unreasonable harm. Wisconsin once followed the “common enemy” rule, which let landowners push surface water away more or less as they pleased. In State v. Deetz (1974), the Wisconsin Supreme Court replaced it with the “reasonable use” rule from the Restatement of Torts. Under it, a landowner who changes how surface water flows can be liable if the interference is unreasonable, which courts judge by weighing the harm to the neighbor against the usefulness of the work.

In practice, that means a good drainage fix moves water to a legitimate outlet: a swale that follows the natural drainage path, a dry well, a ditch, or a storm sewer where connection is allowed. It does not mean piping your problem to the lot line and letting the neighbor deal with it. A contractor who suggests that is setting you up for a dispute. This is general information, not legal advice; if a dispute is already underway, talk to an attorney.

Do I need a permit to fix drainage in Walworth County?

It depends on the job and where you live, so check before work starts. A few common triggers:

• Shoreland property. Much of Walworth County sits near lakes such as Geneva, Delavan and Como. Walworth County’s shoreland zoning ordinance regulates land use within shoreland areas, and shoreland codes in Wisconsin commonly require a permit for filling, grading, ditching or excavating near the water, along with erosion control. If you are within shoreland jurisdiction, call Walworth County Land Use and Resource Management before any regrading.
• Larger land disturbance. Towns and villages in the county have construction site erosion control and stormwater ordinances that apply once a project disturbs enough ground. Thresholds and fees vary by municipality, so ask your town or village clerk.
• Work in the right-of-way. Replacing a driveway culvert or regrading a roadside ditch usually needs sign-off from whoever maintains the road.
• Plumbing connections. Tying into, or disconnecting from, a sewer usually needs a plumbing permit and a licensed plumber.

A local contractor should know which office to call and pull any permit as part of the job; LandEx Company pulls permits when they are required. A contractor who says drainage never needs a permit is a warning sign.

Do I have to call Diggers Hotline before digging a drain?

Yes. Wisconsin Statute 182.0175 requires anyone planning nonemergency excavation, homeowners included, to notify Diggers Hotline at least three working days before digging. Weekends and legal holidays do not count. You can call 811 or file a request online, and a ticket stays valid if work starts within 10 calendar days of the legal start date.

Two details catch people out on drainage jobs:

• Private lines are not marked by the hotline. Diggers Hotline notifies member utilities. Privately owned lines, such as a buried line to a detached garage, a propane line, an invisible pet fence or irrigation pipe, are your responsibility to locate. A private locating service can mark them.
• Machines stay back from the marks. The excavator’s guide sets a minimum 18-inch clearance between a marked, unexposed line and the cutting edge of power equipment. Anything closer gets dug carefully by hand. French drain trenches often run right where gas and electric lines enter the house.

Each contractor working on a site should file its own ticket.

What drives the cost of fixing yard drainage?

Two jobs that sound the same can be very different on the ground. What moves the number:

• Length and depth of trenching. Every foot of French drain or buried downspout line is excavation, gravel, pipe, fabric and backfill.
• Soil. Clay is slower to dig and may need a larger outlet or a different system than sandy ground.
• The outlet. The fix is only as good as where the water ends up. Reaching a ditch, a daylight point down the slope, or a properly sized dry well can be the biggest single variable.
• Access. Narrow side yards, fences, mature trees and finished landscaping slow machines down or rule out larger ones.
• Volume of fill for regrading. Bringing in, spreading and compacting soil adds up fast on a large yard.
• Restoration and permits. Topsoil, seed or sod over the work, plus any permits or a plumber for a sewer disconnect.

Get every quote in writing: where water is collected, where it goes, pipe type, depth and restoration. A low quote with a vague outlet is not a bargain.

What should I ask before hiring someone for drainage work?

We cover contractor vetting in more depth in our guide on how to choose an excavating contractor. For drainage specifically, these questions sort the experienced from the hopeful:

1. What do you think is causing the water problem, and how did you decide that?
2. Where exactly will the collected water go, and is that outlet legal and lasting?
3. Will you file the Diggers Hotline ticket and locate any private lines?
4. Does this job need a permit here, and who pulls it?
5. Will your own crew and equipment do the trenching and grading?
6. What happens if water still collects after the first big rain?

Comparing site contractors around Milwaukee and Waukesha? See our roundup of the best excavating contractors in Milwaukee and Waukesha and its criteria. Clearing a new lot first? Our guide to land clearing companies near Milwaukee covers that first step.

Frequently asked questions

Who is the best first call for standing water in my yard?

If there is no sewage smell and nothing is backing up inside, start with an excavating or drainage contractor who will walk the property and find the cause. If water or sewage is coming up through floor drains, call a licensed plumber first.

Is a French drain a plumbing job in Wisconsin?

A French drain that collects groundwater in the yard and discharges to daylight or a dry well is site work, not plumbing. If the drain is tied into a sewer or another plumbing system, that connection falls under Wisconsin’s plumbing rules and needs a licensed plumber and usually a permit.

Can I connect my downspouts to the sewer?

Usually not to the sanitary sewer; many Wisconsin communities restrict clear water connections. Check with your utility first, and plan on a yard outlet instead.

How long does Diggers Hotline take?

Wisconsin law requires at least three working days of notice before you dig, not counting weekends or legal holidays. The request is made by calling 811 or online.

My neighbor’s regrading floods my yard. What can I do?

Talk to your neighbor, then your town or village, which may have grading rules the work had to meet. Under Wisconsin’s reasonable use rule, a landowner can be liable for unreasonably sending surface water onto someone else’s land. An attorney can explain your options.

When is the best time of year to fix drainage in southeast Wisconsin?

Late spring through fall, once the ground is thawed and firm enough for machines. Photograph where water goes during spring thaw, then schedule the work.

Get a drainage assessment from LandEx Company

LandEx Company is based in Elkhorn and works across Walworth County, including Lake Geneva, Delavan, Williams Bay, Fontana, Walworth, East Troy, Whitewater, Mukwonago and Lauderdale, along with projects in the Milwaukee and Waukesha area. We walk the property, find where the water is really coming from, and give you a plan and a quote you can understand. If the problem belongs to a plumber or your municipality, we will tell you. Call (262) 327-9847 or get a quote online for a free estimate.