Mon–Sat 7am–6pm · 24/7 Emergency Line
Serving Santa Ana & Central OC
A hydrostatic test answers a question a camera cannot: does the drain and sewer system hold water? The line is plugged, filled, and the level is watched. It either holds or it does not, and you get that in writing, which is exactly what a buyer, a seller or an adjuster needs.
Drains are not pressurised in normal use, which is why a leak in one is so hard to prove. A hydrostatic test creates the pressure artificially: the system is sealed and filled with water, and then physics does the rest.
| Camera inspection | Hydrostatic test | |
|---|---|---|
| Question answered | What does the pipe look like? | Does the system hold water? |
| Finds | Roots, cracks, offsets, bellies, collapse | Any loss of water, anywhere |
| Misses | A leak with no visible defect | Where the leak is |
| Result | Footage you can watch | Pass or fail |
| Best for | Diagnosing a known problem | Proving a system, for a sale or a claim |
| Under a slab | Shows condition | Proves integrity |
Run together they cover each other’s blind spots, which is why a thorough pre-purchase inspection on an older house often includes both. See sewer camera inspection.
This is the one place our no-find-no-fee guarantee does not apply, and the reason is worth stating rather than hiding. On a leak detection call you are paying us to answer “where is it?” — no answer, no fee. On a commissioned hydrostatic test you are buying the test itself and the report. A pass is the result you hoped for and it is a real deliverable, so it is charged.
It is the same distinction that applies to a camera inspection. Everything we price is on the pricing page.
A fail is not a verdict on the whole system. It means water left it somewhere, and the next job is narrowing where.
| Then what | How |
|---|---|
| Isolate section by section | Re-test smaller portions to find which one loses |
| Camera the failing section | Look for the defect now that the area is known |
| Locate and mark | A transmitting camera head gives position and depth |
| Quote the repair | Spot repair, lining or replacement, in writing |
The cost gap between those repairs is large, which is why narrowing matters more than reacting. A single failed joint at twelve feet under a lawn and a deteriorated run under a finished floor are both “a failed hydrostatic test” and they are not remotely the same invoice.
Supply leaks announce themselves. They are pressurised, they run constantly, and they show up on the water bill within a cycle or two. A drain leak under a slab does none of that, and the difference is the whole argument for testing.
| Supply leak | Under-slab drain leak |
|---|---|
| Pressurised, runs 24 hours a day | Only leaks when something drains |
| Shows on the water bill | Costs nothing on the bill, the water was used anyway |
| Often audible | Silent |
| Frequently produces a warm spot | No thermal signature at all |
| Acoustic detection finds it | Acoustic detection cannot — no pressure to listen to |
| Damage shows up as wet flooring | Damage shows up as soil washing out under the slab |
Read the right-hand column together and the picture is a leak with no symptom, discharging waste water into the ground under your foundation for years. That is why the test exists and why a house can pass every other check and still have one.
Two things, and an honest page says both.
If we think a test is likely to do more harm than good on your specific line, you will be told that instead of being sold one.
We are licensed and insured plumbers, and this site is about leaks — finding the ones you cannot see and repairing them properly. Roughly half of what looks like a plumbing leak turns out not to be one, so the boundary is worth stating plainly.
Roof leaks are a roofer. Water under an air handler is an HVAC technician clearing a condensate drain. Water under an appliance is appliance repair. Drying, restoration and mold are separate trades again, and gas line repair is SoCalGas or a licensed gas fitter. We detect gas leaks, we do not repair gas lines.
The full list, with the trade to call for each, is on what we don’t do.
Most of these are commissioned against a deadline, so the practical points matter.
If you are the seller, running it before listing is worth considering. A known result you have priced into the asking figure is a very different conversation from one discovered by somebody else during escrow.
A plain pass or fail on your drain system, documented for a sale or a claim.
(714) 386-7923Call or text, day or nightSchedule a VisitThe drain system is sealed at the cleanout with a test plug, filled with water to floor level, and the level is marked and watched. If it drops, water is leaving the system somewhere under the house. If it holds, the system is sound.
No, and they answer different questions. A camera shows what the pipe looks like; a hydrostatic test proves whether it holds water. A line can look acceptable on camera and still fail a hydrostatic test, which is why both together are the thorough option.
$250 to $500, charged whether the system passes or fails. You are buying the test and the report rather than a result — a pass is a genuine deliverable and it is often exactly what you commissioned it for.
Because the two are different transactions. On a leak detection call you are paying us to find something, so no find means no fee. On a commissioned test you are paying for the test and the written result, and that gets delivered either way.
Allow a few hours, and longer if a camera inspection runs alongside. The watching period is the part that cannot be shortened, because a slow loss is precisely the thing a rushed test would miss.
On an older slab home, it is one of the more worthwhile inspections available — a failed under-slab drain is expensive and invisible. Book it inside the inspection contingency, while the result can still change the deal.
It puts load on the system that normal use does not, so a line that is already badly deteriorated can be stressed by it. It is uncommon. On a line we already suspect is in poor condition we camera it first, and if a test looks likely to do more harm than good we will say so rather than sell you one.
The test proves a leak exists; it does not say where. The next step is isolating sections and re-testing to narrow it down, then a camera on the failing section to see the defect. Only then is a repair worth quoting.
It makes the job straightforward. Without one, access is usually through a pulled toilet, which takes longer and is quoted accordingly. We tell you which access we need before arriving rather than after.
It is written for that purpose: dated, with the method, duration, photographs and a plain pass or fail. We send it to whoever you nominate. What we cannot do is tell you how a particular adjuster or lender will weigh it.