Water standing between the houses
Water that sits in the strip between two houses after a rain, or runs over from the neighbor’s yard, raises one question first: whose problem is it? This page answers that for each town around Charleston, then covers what can be done on your side of the line.
Send a short video of it during a rain. We will tell you what we see: where the water comes from, where it can go, and whether it is a job for us or a call to the town.
- What this covers
- Water between houses, a neighbor’s runoff, downspouts aimed at the line
- Who maintains what
- Towns and counties keep their own ditches, pipes and easements
- Before any digging
- Find the easement and the town’s rules first
First, find where the water comes from.
Side-yard water usually comes from one of four places. Roof downspouts that empty into the strip. A yard graded so both lots tip toward the line. A swale between the lots that has been filled in or blocked by a fence, mulch or an AC pad. Or a pipe or ditch that belongs to someone else. Each has a different fix, and sometimes a different owner.
The way to tell is to watch it rain. Where does the water enter the strip, which way does it move, and where does it stop? A phone video taken during a storm answers most of that before anyone digs.
- Downspouts
- Where each one empties, on both houses
- Grade
- Which way the ground tips at the property line
- Swale
- The shallow channel between the lots, and what blocks it
- Pipes and ditches
- Who owns them: you, the town, the county or SCDOT
Who is responsible, town by town
No town or county page we read says it fixes drainage between two private lots. Each one maintains its own ditches, pipes, easements and road drainage. Mount Pleasant says it may be unable to work on a system that is not part of the Town’s drainage system.
So if the problem is on the public system, report it. If it is a private swale or drain between the yards, not in a public easement, it usually falls to the owners or the HOA.
The rules that apply to both of you
Mount Pleasant puts it plainly for single-family lots: an owner who develops or alters land must not cast concentrated runoff onto lower property in a way that harms it, or block runoff coming from higher property. On work under its single-family stormwater permit, the checklist keeps roof downspout discharge points at least 10 feet from a common property line.
On projects that need a City stormwater permit, the City of Charleston’s manual says no fill may be placed where it can slide or wash onto another property. A new discharge point onto a neighbor’s land, where none existed before, needs that neighbor’s written consent or an existing drainage easement. So the usual quick fix, a berm or a load of fill that just moves the water across the line, can break those rules.
Between neighbors, South Carolina courts have followed the “common enemy” rule for surface water, with limits. In Lucas v. Rawl Family Ltd. Partnership (2004) the S.C. Supreme Court said the rule is subject to nuisance law, and that an owner may not collect surface water with a ditch or other structure and cast it in concentrated form onto lower land.
That is general information, not legal advice. For a dispute with a neighbor, talk to a South Carolina attorney.
Checked in October 2026 against these sources: City of Charleston Field Operations · City of Charleston encroachments · City Stormwater Design Standards Manual, 2026 · Mount Pleasant stormwater services · Mount Pleasant single-family stormwater program · North Charleston Public Works · North Charleston encroachment permit · Summerville Public Works · Town of James Island stormwater · Charleston County work order request · Berkeley County roads FAQ · Dorchester County ditch maintenance · SCDOT permits · Lucas v. Rawl Family Ltd. Partnership (S.C. 2004). Rules change, so we confirm the current text for your address before quoting.
- Mount Pleasant
- When land is altered, no harmful concentrated runoff onto a lower lot. Downspouts 10 ft from a shared line on permitted work
- City of Charleston
- On permitted projects: no fill that can wash onto another property; consent or an easement for a new discharge point
- Drainage easements
- Encroachment permission before a fence, pipe or yard drain goes in
- A dispute
- A South Carolina attorney, not a contractor
Fixes that keep the water on a legal path
Most fixes give the water a place to go that is not your foundation or your neighbor’s yard. That means reopening or reshaping the swale between the lots, running downspouts through solid pipe to a legal outlet, or a French drain or catch basin where the ground stays wet. The outlet decides the job, so we find it first.
If the water is the neighbor’s, the simplest fix is often a shared one: one swale or one drain line serving both lots, built with both owners’ agreement. If the shared strip is a drainage easement, the town’s permission comes first.
Grading or fill on a single-family lot may need a permit. Mount Pleasant requires its stormwater and tree permit for land disturbance on a single-family lot, and unincorporated Charleston County requires a zoning permit for grading, filling or surfacing. How we build the drains themselves is on our yard drainage page.
What people ask about water between houses.
Water stands between my house and my neighbor's after every rain. Who do I call?
Start by finding where it comes from. If it backs up from a street drain, a roadside ditch or a pipe the town or county maintains, report it to them; the numbers for each town are on this page. If it collects in a private swale between the yards, not in a public easement, it usually falls to the owners or the HOA, and a drainage contractor can find the cause and the outlet.
My neighbor's water runs into my yard. Is that legal?
Local rules and South Carolina case law both limit sending water onto a neighbor in a concentrated flow, for example through a pipe or a ditch. Whether your situation crosses that line is a question for a South Carolina attorney. On the practical side, a swale or drain that carries the water to a legal outlet often fixes it for both lots.
Can I just build up the ground on my side?
Not if it sends the water onto the neighbor. On permitted projects, Charleston’s stormwater manual rules out fill that can wash onto another property, and Mount Pleasant says an owner who alters land must not cast concentrated runoff onto a lower lot in a way that harms it. Grading or fill may also need a permit, so we check the town’s rules before any soil moves.
Can I put a pipe or a fence in the drainage easement between the houses?
Only with permission. In the City of Charleston, Mount Pleasant, North Charleston and Berkeley County, work in a public drainage easement needs an encroachment permit first. An easement usually shows on the plat or the deed.
Will the town fix it for me?
Only if it is their system. Every town and county page we read describes its own ditches, pipes and easements, and none says it fixes drainage between two private lots. Mount Pleasant says it may be unable to work on a system that is not part of the Town’s.
Where should my downspouts go?
Away from the shared line, through solid pipe, to a legal outlet. On work under its single-family stormwater permit, Mount Pleasant keeps roof downspout discharge points at least 10 feet from a common property line.
Film it in the rain, send it to us.
A short video of where the water comes in and where it stops. We will tell you what we see and what fixes it.