Yard Drainage in Maury County, TN
Yard drainage in Maury County works best as a whole system: ground shaped to move water off the house, a swale or French drain to carry it across the lot, and a legal place for it to end up. That last piece is the tricky one in limestone country, where a sinkhole that looks like a handy outlet can be a regulated injection well. Here's how to plan a full drainage job on clay, what TDEC and Columbia require, who to call in Spring Hill and Mount Pleasant, and what the work runs nationally, with dates.
Plan backward from the outlet
Before anyone prices a trench, settle where the water may go. Walk the yard in a hard rain and note where the water comes from (the roof, the driveway, a hill or a neighbor's lot above you), where it collects, and where it could leave your land. Typical outlets are a roadside ditch, a natural drainage way, a low corner of your own property that can take it, or a storm drain in town. Every fix below is sized and sloped to reach that point.
Why a sinkhole isn't a free outlet
Under TDEC's guidance on karst and stormwater (effective December 8, 2017), a sinkhole on land being developed in a way that changes the water flowing to it is regulated as a Class V injection well, and the guidance names "grading the property in a manner that directs flow to the sinkhole" as one way that happens. Injection wells are prohibited unless TDEC authorizes them. The guidance sorts common drainage work like this:
- No Class V authorization: downspouts turned out onto lawn or other ground that soaks water in; most infiltration trenches; and situations where "All stormwater is directed away from the sinkhole."
- Authorization needed: dry wells, seepage pits, and sinkholes improved to take stormwater; a trench deeper than it is wide, or one built with perforated pipe or drain tile, that puts water into the ground; and any collection system that discharges through a sinkhole.
So a French drain that carries water to a ditch or open ground is a different case from one that ends in a buried pit or in the sinkhole out back. TDEC's injection well page lists form CN-1106, "Storm Water Discharge to the Subsurface or Modification of a Karst Feature," with fees paid online and most Class V reviews taking two to four weeks (complex projects can take up to six months). Start with the TDEC Columbia Environmental Field Office, 1421 Hampshire Pike, (931) 380-3371, before any pipe points toward a sinkhole.
The pieces of a full drainage job
Most wet yards need two or three of these together. Columbia's Engineering Standards and Specifications (September 2024) supply useful numbers, and inside the city they're binding.
- Regrading. Reshaping soil to fall away from the foundation. Columbia's standards say "Final grades shall provide proper drainage away from structures and prevent standing water, where possible."
- Swales. Shallow, grassed channels that move surface water across the lot. Columbia sets property-line swales at least six inches deep, with side slopes no steeper than 3 to 1 and at least a 2 percent fall.
- French drains. A gravel-filled trench, usually around perforated pipe, that gathers water and carries it to the outlet. On sticky clay, ask how the trench will pick up water and exactly where the pipe ends.
- Surface inlets. Catch basins or channel drains at a low spot or across a drive, piped to the outlet. Columbia's 12-inch minimum for pipes outside the right-of-way exempts roof drains, underdrains, and yard drains serving one house lot.
- Curtain drains. A shallow interceptor across a slope, for water coming downhill toward the house. Lawn Love describes one as "only 9 to 12 inches deep and suitable for sloped yards."
- Downspouts. Extensions or buried pipe that release roof water onto open lawn well away from the house, which TDEC lists as not needing Class V authorization.
Dry wells appear in national price guides, but TDEC lists them as needing authorization, so treat one as a permit question.
Neighbors, ditches, and city rules
Columbia. The engineering standards say residential lot drainage "shall be designed to minimize lot to lot drainage," that drainage work can't increase flood hazard for an adjacent property, and that existing drainage courses can't be blocked. They also forbid grading or draining a site so as to raise the peak runoff to "sinkholes, dry wells, or drainage wells." Grading an acre or more, or adding 10,000 square feet of hard surface, needs the city's Land Disturbance Permit. Development Services: 931-560-1560.
Spring Hill and Mount Pleasant. Ask Spring Hill's stormwater office, (931) 329-4836. Mount Pleasant's posted stormwater ordinance lists karst features among the triggers for a stormwater plan; City Hall, (931) 379-7717, can confirm what applies to a yard.
County road ditches and creeks. Before a pipe empties into a county road ditch, ask the Maury County Highway Department, 931-375-6203. Digging in a creek channel takes an Aquatic Resource Alteration Permit from TDEC; the permits guide covers streams and buffers.
Tennessee 811
Trenching and regrading are excavation under Tennessee's damage prevention rules, whether a homeowner or a contractor digs. File three to ten working days ahead at 811 or 800-351-1111, and flag anything private yourself, like an irrigation run or the pipe from a well.
What drainage work costs
Lawn Love's guide, updated October 2026, puts the national average French drain at $5,000, with most professional installs between $2,800 and $6,500 and exterior drains at $10 to $75 a linear foot. It lists land grading at $800 to $4,000 most of the time. HomeAdvisor's 2025 guide adds yard or trench drains at $30 to $90 a linear foot and curtain drains at $1,000 to $5,000, and notes that rocky or clay-heavy soil can make trenching take longer.
Put together, regrading plus 100 feet of exterior French drain comes to roughly $1,800 to $11,500 on Lawn Love's numbers, before inlets, seeding, or any TDEC fee. Those are national averages, and limestone in the trench line can change them. Budget on a quote made after someone has stood in your yard and looked at the low spots.
Who does this work
Grading and excavation contractors, landscapers, and some land clearing outfits take on drainage. Tennessee requires a contractor license once a project's total cost reaches $25,000; the hiring guide explains how to look one up and what insurance to ask about.
Drainage questions
Is it legal to pipe roof water into the sinkhole out back?
Not without talking to TDEC first. Piping water toward a sinkhole is exactly what the Class V guidance regulates. Turning the downspouts out onto open lawn is the version it doesn't.
Does a yard drainage project need a permit?
Often not, but four things can change that: water sent underground or into a sinkhole (TDEC), work in a creek (TDEC), a big enough grading job inside Columbia (the city), and a pipe into a county road ditch (the Highway Department).
What should a drainage quote spell out?
Where the outlet is, the linear feet of trench and its depth, pipe type, the gravel and any fabric, the area to be regraded, how bare soil gets seeded and covered, what happens to spoil, and who files any permit.
Will the fix send water onto the neighbor's land?
It shouldn't. Inside Columbia, the standards bar drainage that adds flood hazard next door. Anywhere in the county, talk with the neighbor before water is pointed their way, and ask the contractor to show you where it will go.
How we help
Describe where the water stands, where it seems to come from, and whether a sinkhole, creek, or road ditch is nearby. That goes to one independent contractor who takes on drainage and grading near you. They look at the yard and price it, and the choice to hire is yours. Nothing is owed for the referral.
Want a local contractor to walk your land?
Call or send a short request. There's no charge for the referral.