Monsoon Season Plumbing: What Actually Goes Wrong, and What to Do

Arizona's monsoon runs June 15 through September 30, and it is hardest on plumbing from mid-July into mid-August. The trouble is not the total rainfall, it is how fast it arrives. Desert ground sheds a hard rain instead of soaking it up, so water runs off into washes, yard drains, and whatever grade points at your house. The most common results are backed-up yard and area drains, sewer and septic problems from saturated ground, water pushed toward foundations, and well pumps knocked out by storm power outages.

What to do right now

• Before the season: clear every yard drain, area drain, and downspout, and make sure water leaving them actually goes away from the house rather than pooling against it.
• Walk your grade after the first storm. Standing water near a foundation, a slab, or a cleanout tells you where the next problem starts.
• If you are on a well, check that the wellhead is properly sealed and sitting above the grade around it so runoff cannot reach it.
• Know where your main water shut-off is before you need it in the dark.
• If a drain backs up during a storm, stop running water in the house rather than adding to it, and call before it moves into finished space.
• If you leave for the summer, have somebody competent check the property while you are gone. Monsoon lands almost exactly on the months seasonal homes sit empty.
• After a storm, listen for a well pump that will not restart and look for slow drains, both of which are common the day after and easy to fix early.

Likely causes

• Rainfall rate, not volume. A monsoon cell can drop more water in twenty minutes than a drain was ever sized to carry, and hard desert ground sends nearly all of it to the surface instead of absorbing it.
• Yard and area drains silted up with sand, gravel, and debris washed off the landscape, so the first real storm has nowhere to put the water.
• Runoff from higher ground. Rain falling on a slope miles away arrives at your property as moving water, which is why a house that saw no rain at all can still flood.
• Saturated ground around sewer laterals and septic leach fields, which slows drainage and can push water back toward the house.
• Storm power outages taking out well pumps, which means no water at all until power returns.
• Debris and surface water reaching a wellhead that should stay sealed, which is a contamination risk rather than just an inconvenience.
• Dust storms and microbursts driving grit into outdoor fixtures, hose bibs, and equipment before the rain even starts.

When to call a pro

If the quick fixes do not solve it, this is usually a drain cleaning job. Liberty dispatches 24/7 with upfront pricing.