Standing Water in Your Yard: What to Check Before You Call Anyone

Standing water in a yard gets quoted very differently by different contractors, and the range is wide enough that it is worth spending twenty minutes understanding your own problem first. The single most useful thing you can establish before anyone visits is where the water is coming from, because that is what separates a few hundred dollars of downspout work from a trenched drainage system.

None of this requires tools or getting under the house. It does require going outside at an inconvenient moment.

Step 1: Go outside while it is actually raining

This is the step everyone skips and it is worth more than all the others combined. Water leaves evidence, but during a storm it shows you the mechanism directly: where it sheets across the ground, which direction it travels, where it slows down and where it stops.

Put a coat on during steady rain and walk the perimeter of the house. You are looking for water moving, not water sitting. Note which way it runs at each corner, and whether any of it is running toward the building rather than away from it.

Step 2: Follow the roof water

A roof sheds a remarkable volume in one storm, and every downspout concentrates a large share of it into a single point. Check each downspout in turn and answer one question: where does this water end up?

• Discharging straight onto the ground at the base of the wall — the most common fault, and the most likely explanation for a wet spot nearby or water in a crawl space
• Into a splash block that is cracked, sunken or tipped back toward the house — functionally the same as no splash block
• Into a buried pipe — good, but follow it; buried leaders that have crushed, silted or disconnected simply discharge underground next to the foundation
• Overflowing at the gutter in heavy rain — a gutter problem, not a drainage problem, and much cheaper to fix

If the wet patch in the lawn is downhill of a downspout that empties at the wall, there is a good chance you have found your answer. Roof water is the cheapest thing on this list to correct and it is where we look first on every drainage call we attend.

Step 3: Run the 24-hour test

After the rain stops, note the time, then go back and look at the same spot a day later and two days later. How long the water persists tells you what kind of problem it is.

• Gone within a few hours — normal, and not worth spending money on
• Still there after 24 hours — the surface has nowhere to shed to, or the soil below has stopped accepting water
• Still there after 48 hours, repeatedly — a genuine drainage fault, and in heavy clay often a saturated-ground problem rather than a surface one
• Never fully dries even in a dry week — suspect a high water table, a spring, or in rare cases a leaking supply or irrigation line rather than rainfall at all

Step 4: Find the low point and the flow path

Water does not pool randomly. Stand at the wet area and work out, by eye, which direction the ground falls away — and whether it falls away at all. Erosion channels, washed-out mulch, flattened grass and silt lines are all water telling you where it already runs.

Then ask the question that decides everything: is there anywhere lower for this water to go? Drainage is a transport system, and it needs a destination below the collection point. A lot that falls away toward a road, ditch or wood line has an easy answer. A flat lot, or one where the ground rises in every direction, is a harder and more expensive problem — and it is better to know that before you are standing in front of a quote.

Step 5: Check the sump discharge, if you have one

If there is a sump pump, find where its discharge line ends. A pump emptying a few feet from the wall is lifting water out of the pit and handing it straight back to the soil that filled the pit, which can produce a permanently wet patch that has nothing to do with rainfall patterns.

In winter, also check whether that outlet can freeze shut. A frozen discharge backs the pump up, and the pump does not stop trying.

What to photograph before you call

Whoever you call will give you a better answer, faster, if you have this ready. It also makes it much harder for anyone to quote you a system you do not need.

1. The wet area itself, with something in frame for scale
2. Each downspout and where it terminates
3. The same wet area 24 and 48 hours after rain stops
4. Any erosion channel or silt line showing the flow path
5. The direction the ground falls away from the wet area, and what is at the bottom of that fall
6. The sump discharge outlet, if there is one

When it is not a drainage problem at all

Two cases are worth ruling out before anyone digs. If the ground immediately around the house slopes toward the building, that is a grading fault, and a drain installed to compensate for it is treating a symptom. And if a wet area never dries even through a dry spell, consider whether it is rainfall at all — a leaking irrigation line, a failing supply line or a septic problem all produce persistent wet ground and all need a different trade.

If you work through these five steps and the answer is still unclear, that is a perfectly normal outcome and exactly what a site visit is for. But you will have ruled out the cheap explanations, which means the conversation starts in a much better place.