Most drainage problems show up as a symptom, like a damp crawlspace or a puddle that never dries. We figure out where the water is coming from first, then pick the simplest fix that will hold up, from burying downspout lines to regrading or a French drain.
Boise Drainage Problems Start Somewhere Specific
Water damage almost always has a source you can trace. A downspout dumping next to the foundation. A neighbor's yard that sits a foot higher than yours. Sprinklers that hit the same wall every morning. Fix the source and the symptom usually goes away. Treat only the symptom and it tends to come back.
We work on drainage problems in Boise, Meridian, Nampa, Star, Eagle and Middleton. These are the problems we see most and how we sort them out. Calls tend to come right after a storm or in the first weeks of irrigation, which is a good time for a look, since there's still water to follow.
Water in the Crawlspace or Against the Foundation
Plenty of Treasure Valley homes sit on crawlspaces, and a damp one is often the first sign of a drainage problem. Look for standing water after a storm, a musty smell, white mineral crust on the stem wall, or water pooled under the vapor barrier.
The cause is usually outside. Backfill settles into a trough along the wall. Flower beds get built up higher than the lawn. A patio or walk sinks and starts sloping toward the house. Downspouts empty right at the corner. If it only happens during irrigation season, sprinklers or rising groundwater are the likely suspects.
It still helps to know where the water shows up inside. Tell us which wall or corner gets wet and how high the marks sit on the stem wall. That points us to the stretch of foundation to check first.
Standing Water in the Yard
Some yards hold water for days after a spring storm. On clay and caliche, which covers much of Meridian, Nampa and Kuna, water can't soak in fast, so any low spot becomes a pond.
A soggy spot that stays wet all year and doesn't track with the weather is different. Check with your water provider or a plumber first, because a leaking service line looks a lot like a drainage problem. If that's what it turns out to be, we also do water line excavation.
Runoff From the Neighbors or the Irrigation
Newer subdivisions in Star, Meridian and Eagle put houses close together, and the yards don't always step down the way they should. When the lot next door was graded higher, its runoff ends up in your side yard. Pressurized irrigation adds a steady supply of water all summer, and overspray from a neighbor's heads counts too.
On older acreage, an open irrigation ditch can seep into nearby ground or overflow when a headgate gets left open. The fix is usually on your side of the line: a swale or catch basin that picks the water up and carries it around the house.
Ice on the Driveway in Winter
In January, drainage problems become slip hazards. A downspout that empties onto a driveway or walk, especially on the north side of the house, freezes into a sheet every night. Meltwater running off the lawn across concrete does the same. Burying the downspout line under the edge of the driveway or rerouting it to the lawn usually ends it. Where water crosses from the yard, a small regrade or a catch basin at the edge of the concrete picks it up before it freezes.
How We Find Where the Water Comes From
We start by asking when it happens. The timing narrows things down fast. Before the visit, jot down when you've seen water, how long it stays, and whether it started after a change like a new patio, new sod, or a neighbor regrading their lot. Photos taken during a storm help, because the yard may be dry on the day we walk it.
- After storms or snowmelt points to roof water and surface grading.
- On watering days points to your sprinklers or a neighbor's.
- All through irrigation season, especially near the river in Eagle and Garden City, often means rising groundwater.
- All year, even in dry weeks, can mean a leaking water line.
Then we walk the property, check which way the ground actually falls, and follow each downspout to where it empties. Running a hose into a downspout or a low spot shows where water goes faster than any guess.
Matching the Fix to the Problem
We start with the simplest fix that will work and only go bigger when we have to. Plenty of jobs end up as two or three small fixes, like burying two downspouts and regrading one corner, and we explain what each one should change.
- Roof water: buried downspout lines to a dry well or an outlet in the lawn.
- Surface water at the house: regrading so the ground falls away from the foundation, sometimes after removing a sunken patio with concrete breaking and hauling.
- Water crossing the yard: a swale or catch basin. Our drainage excavation page covers how we build them.
- Water moving underground: a French drain.
- A low, uneven yard: grading for landscaping before sod or plants go in.
What Drives the Cost of a Drainage Fix
Price follows the fix. Burying a downspout line is short and shallow. Regrading along a foundation can mean pulling up rock beds, edging and sod. Concrete in the path, sprinkler lines (Digline doesn't mark them) and narrow gates add time on almost any job. On flat lots with caliche, a dry well has to get through the hardpan to work. Once it's done, watch the first big storm or full week of irrigation. That's the real test.
Why Homeowners Call Us About Drainage
Tanner, our owner, does the estimates himself and tells you what he thinks is going on before he prices anything. Our reviews mention quick bids and work finished before the rains came, which is the right time to fix drainage. We're an Idaho registered contractor (RCE-65836) with a 5.0 rating on Google. Call (208) 697-2429 or request a free estimate.
