The short answer
Yes, you can usually water soil near the foundation, but the method matters. In San Antonio, hand-held hose watering is the one tool allowed through the strictest stages, and soaker hoses move to your assigned day. In New Braunfels, the utility names foundations in its rules. Schertz doesn’t use Edwards stages at all. Watering helps by keeping the clay’s moisture steady; it doesn’t fix a foundation that has already moved.
The rules at a glance
| Place | Soaker hose | Hand-held hose | Source |
|---|---|---|---|
| San Antonio (SAWS), year-round | 660 feet above mean sea level is the trigger line; above it, soaker hoses are allowed daily in set hours | Any time | SAWS |
| SAWS Stage 3 | once a week | any time on any day | SAWS Stage 3 page |
| SAWS drip irrigation in Stage 3 | n/a | n/a | Drip runs Monday and Friday |
| New Braunfels (NBU) | Foundations: up to two hours on any day, within 24 inches of the foundation | Same exception | NBU conservation page |
| Schertz | Handheld device or drip at any time | Any time | City of Schertz |
SAWS also says water waste, including runoff, is prohibited at all times. It says coming out of a stage can be considered 15 days after the aquifer is above the trigger.
How SAWS decides the stage
The rules follow the aquifer. Year-round rules apply while it is above 660 feet above mean sea level; Stage 1 starts at 660 feet above mean sea level; Stage 3 at 640 feet above mean sea level. For perspective, the record low at the J-17 well was 612.5 feet, in the 1956 drought. Check saws.org for the stage in force this week and your assigned day.
Why watering a foundation helps
Clay shrinks when it dries. The ASCE Geo-Institute guide says keeping moisture even is the single best thing you can do. ASCE’s Texas Section’s guidelines aim for near uniform soil moisture on all sides of the foundation. In a long San Antonio dry spell, the soil near a house can pull away from the slab edge, and the edge can drop. San Antonio has seen years with 10.11 inches of rain. Steady watering near the edge is a way to slow that.
How to water
The ASCE Geo-Institute guide suggests soaker hoses 18 inches from the foundation, with more water on the drier sides. It tells homeowners to know and obey your city's watering bans and to give the soil just enough to keep plantings alive and growing.
- Pick a method the current stage allows.
- Water the soil near the slab edge, not the walls.
- Go slowly, so water soaks in rather than runs off.
- Look for cracks in the soil. If they’re wide, it’s dry.
- Give the drier sides more water than the damp ones, as the Geo-Institute guide suggests: more water on the drier sides.
When not to water
- When the soil is already wet or the ground is soggy.
- When there’s a leak. A water bill that climbs could mean a pipe; the Geo-Institute guide says to monitor water bills.
- During a restricted day or hour you aren’t allowed to use that tool.
- When a pier and beam crawl space is damp. Drainage first.
Soaker hoses, drip lines and permits
A hose on the ground needs no permit. A permanent system may. In Schertz, a drip irrigation system is allowed at any time under the standing plan. A perimeter watering system on a repaired foundation needs steady maintenance: the FPA says dramatic settlement can follow if it is turned off, and over-watering has risks of its own.
Watering doesn’t replace a repair
The FPA says maintenance such as watering should not be considered a repair. Watering helps a house that is stable; it won’t lift a slab. If doors still stick in a wet spell, call to schedule an inspection.