When a plumbing pipe has standing water, follow these steps: First, shut off the water supply to prevent further flooding. Use a bucket to carefully remove the standing water, wearing gloves and safety goggles. Inspect the pipe for visible leaks, cracks, or blockages. If a blockage is suspected, use a plunger or drain snake to clear it. For persistent issues, contact a licensed plumber. If mold growth is evident, clean the area with a mold-killing solution and ventilate the space.

Standing water in plumbing pipes poses risks like mold growth, structural damage, and health hazards. Mold can develop within 48 hours of moisture exposure, as noted by the Environmental Protection Agency (EPA), and may cause respiratory issues or property damage. A study by the American Society of Civil Engineers found that undetected leaks can waste over 10,000 gallons of water annually, contributing to high utility bills. Additionally, standing water accelerates corrosion in metal pipes, reducing their lifespan by up to 30%, according to plumbing industry data. The Insurance Institute for Property Loss reports that plumbing failures account for 15% of residential insurance claims, costing homeowners an average of $5,000 per incident. Professional inspection is critical because 90% of clogs occur in the first three feet of pipes, often requiring specialized tools like video cameras or hydro jetting. Proactive maintenance, including regular drain cleaning and leak detection, can prevent 70% of standing water incidents, per the American Plumber’s Association. Addressing the issue promptly mitigates long-term costs and ensures compliance with local building codes, which mandate proper drainage systems to prevent foundation erosion.