Pet Urine Odor on Concrete Patios and Dog Runs

Why the smell keeps coming back

Concrete is porous, and urine goes straight in. The liquid evaporates, but it leaves behind uric acid salts and organic compounds deep in the pores. Those residues do not dissolve well in plain water. When the slab gets damp again, from a morning dew, sprinklers or the next accident, the odor comes back strong.

Heat makes it worse. A patio in the Valley that sits in afternoon sun bakes those residues, and the smell rises off the concrete on hot days. That is why a hosed-down dog area often smells fine for an hour, then returns to the same sharp odor.

Why pressure washing alone is not enough

A pressure washer flushes the surface and lifts dirt, but it does not break down uric acid salts in the pores. Many owners pressure wash a dog run, enjoy a day or two of relief, and then find the odor back.

What works is breaking the residue down chemically first. Enzyme cleaners contain proteins that digest the organic compounds in urine. Some products combine enzymes with bacteria cultures that keep working as they dry. The cleaning step comes after, to rinse out what has been broken down.

A method that actually works

Start by rinsing and cleaning the area to remove loose dirt, hair and debris, so the enzyme cleaner reaches the concrete instead of the grime on top. A surface cleaner gives an even, deep clean on larger patios.

Then apply the enzyme cleaner generously, especially on the spots dogs use most. The concrete needs to be saturated, because the residues sit below the surface. Let it dwell for the time on the label, and keep it damp rather than letting it dry in the sun. Evening or a shaded day helps.

Finally, rinse thoroughly. Heavily used spots may need a second round. Avoid bleach-based cleaners on top of urine, since they do not remove the source and can react with ammonia in urine to form irritating fumes.

Dog runs, artificial turf and gravel edges

Dedicated dog runs are often concrete with a slope to a drain. Check that the drain is clear and the slope still sends water where it should. Low spots that hold puddles will always smell, and fixing drainage is a repair rather than a cleaning job.

Artificial turf laid over concrete or a base traps urine underneath. Turf needs its own cleaning routine and sometimes lifting to clean the base. Gravel edges next to concrete also hold odor and may need raking, rinsing or replacing.

Wood fences and stucco walls at the edge of a dog area absorb urine too, especially at the base where male dogs mark. Those spots can be treated with the same enzyme cleaner, applied gently and rinsed at low pressure, since high pressure can damage wood and stucco. Raw, soaked fence boards near the ground may hold odor until they are replaced.

Keeping it fresh between cleanings

Rinse the favorite spots with water daily or every few days to dilute fresh urine before it soaks in. Apply an enzyme cleaner weekly or every couple of weeks in summer. Shade the area if you can, since heat drives the odor.

Sealing concrete with a penetrating sealer after a thorough cleaning can slow how much soaks in, making routine care easier. It will not stop odor completely, but it helps. Our guide to pressure washing around pets covers keeping animals safe during cleaning.

Water handling and cost

Rinse water from pet areas carries waste, so do not wash it toward the street. Los Angeles Municipal Code section 64.70.02 prohibits discharging untreated wash water from paved-surface washing into the storm drain system. Direct it to landscaping or a proper drain and pick up solid waste before cleaning.

As of October 2026, patio cleaning on our calculator is $0.65 per square foot, with a $195 minimum per visit. At Say Wash It we pair a deep surface clean with an odor treatment step, and we are honest that very old, heavily soaked slabs may need follow-up enzyme treatments from you to keep the smell down.