Is dark slimy AC leak a health risk?« Back to Previous Page

The AC in our apartment in Jumeirah seems to be leaking a small amount of dark, slimy water onto the floor whenever it runs for a while. It’s been doing this on and off for about two weeks, and now there’s a faint but persistent moldy smell in the living room. With the humidity rising again, how urgently do I need to call a technician before this becomes a bigger health or property issue?
Posted by Ashley Hill
Asked on March 25, 2026 9:48 am
Good afternoon. This is a very common yet serious issue we encounter in Dubai, especially in older buildings in areas like Jumeirah. To answer your question directly: Yes, a dark, slimy AC leak is a significant health risk and requires immediate attention.

The leak you're describing is not just condensation (which is clear water). The dark, slimy substance is a classic indicator of microbial growth, or more plainly, mold and bacteria proliferating within your AC unit's drip pan and drainage system. The persistent moldy smell confirms an active colony. When the unit runs, it aerosolizes these spores and fragments, blowing them directly into your living space. Inhaling these can trigger allergic reactions, asthma attacks, respiratory irritation, and other health issues, particularly for children, the elderly, or those with compromised immune systems.

The high humidity we're experiencing now is literally feeding the problem, accelerating the growth. Beyond health, this leak is a property risk, potentially causing water damage to ceilings, walls, and floor structures, which is incredibly costly to repair.

You need a professional inspection and remediation, not just a AC technician. A standard AC service might clear the drain line but will not address the biological contamination. Our certified mold inspectors use moisture meters, thermal imaging, and air/surface sampling to identify the full extent of the contamination. Remediation involves a full hygienization of the AHU (Air Handling Unit), coil, and drip pan using UAE-approved biocides to safely eliminate the source.

Don't wait for this to escalate. For a thorough inspection and a permanent solution, please call our team at 800-MOLDS (800-66537) or email hello@saniservice.com. We serve all areas of Dubai, including Jumeirah.
Posted by Sani Admin
Answered on March 27, 2026 6:27 pm