My kitchen sink is leaking from underneath. Where is it coming from?

Kitchen sink leaks from underneath typically come from one of four main sources: the supply line connections, the drain assembly, the garbage disposal (if present), or the faucet base.

The most common culprit is loose supply line connections where the hot and cold water lines connect to the faucet. These compression fittings can loosen over time, especially in Ottawa's climate with seasonal temperature changes that cause pipes to expand and contract. You'll usually see water dripping from the threaded connections or pooling around the shut-off valves.

Drain assembly leaks are also frequent, particularly at the slip joints where the P-trap connects to the tailpiece or drain pipe. The rubber washers in these connections can deteriorate or shift, causing water to seep out during drainage. If you have a garbage disposal, check where it connects to the sink mounting assembly and the discharge pipe - these are common leak points that often develop after years of vibration.

Faucet base leaks occur when the packing nut under the sink becomes loose or the O-rings wear out. This type of leak often shows up as water running down the faucet stem onto the sink deck and dripping underneath.

To identify the source, dry the area completely, then run water and watch carefully. Run the faucet to check supply lines and faucet base, then fill the sink and drain it to test the drain assembly. In Ottawa's older homes, original plumbing connections may be 20+ years old and more prone to these issues.

Turn off the water supply immediately if you see a significant leak, and avoid using the sink until repairs are made. While you might tighten a loose connection yourself, most under-sink repairs require proper tools and expertise to prevent water damage to your cabinets and flooring.

For a proper diagnosis and repair of your kitchen sink leak, Ottawa Pro Plumbing can provide a free estimate and ensure the fix meets Ontario plumbing standards.

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