Turn on the kitchen faucet and the water looks milky for a few seconds, or the stream sputters and spits. Many homeowners reach for a test kit or start wondering about the city supply. Before you do either, look at the small mesh screen at the tip of the faucet, called an aerator. It is one of the cheapest parts of your plumbing to check, and it is often the first place sediment and mineral scale collect. This check takes minutes and needs no special equipment.
What the aerator actually does
The aerator mixes air into the stream so the flow feels soft and does not splash. It also has a fine screen that catches debris. Over months, that screen can gather grit from pipes after repairs, flakes of scale from hard water, and bits of rubber or washer material. When the screen clogs, you may see weak flow from one tap while others run normally, or you may see a cloudy stream that clears in a glass.
That cloudiness is usually trapped air, which is harmless and disappears when the water sits. Grit that stays in the stream is different. A simple test: fill a clear glass and hold it to the light. If the water clears in a minute and no particles settle, the aerator is the likely cause. If particles settle or the water stays cloudy, the issue may be upstream, so keep reading.
How to clean it in ten minutes
Unscrew the aerator by hand, or use a grip with a cloth between its jaws and the metal so you do not scratch the finish. Note the order of the small washers and screens as you take them apart, since reassembly goes wrong when parts get mixed. Rinse each piece under running water, scrub gently with an old soft brush, and soak in plain white vinegar if you see mineral crust. Reassemble, screw it back on, and run the tap for a minute before judging the flow.
Check every faucet in the house, not only the kitchen. Bathroom and utility-sink aerators often clog more slowly, but they collect the same kinds of debris. If one tap keeps clogging within weeks, the cause may be sediment rather than normal wear, and that is a good reason to ask your water provider or a plumber what is moving through the line.
If cleaning does not restore the flow, a new aerator is a low-cost fix. Match the thread size on the faucet, since aerators fit only certain threads, and keep the old part or a photo of it so you can compare sizes at the hardware store. Keep a short note of the date you cleaned each screen. Repeated clogs at the same tap tell you more than a single one does.
Clean the screen before you sample
If you plan to send water for testing, do not collect the sample through an aerator that has just been cleaned or one that is visibly scaled. Crust and grit can change what the sample contains and make results hard to interpret. Use the sampling instructions from your lab, which usually specify whether to run water first and whether to remove the aerator. Write down what you did so the result can be read in context.
Why the rules still matter
A clean screen does not answer every question about PFAS, metals, or other chemicals. Those need a lab and a set method. The standards that shape testing and treatment are also being debated. AWWA and AMWA present oral arguments in judicial review of PFAS rule, as Water Finance and Management reports, describing a judicial review of EPA's National Primary Drinking Water Regulation for six per- and polyfluoroalkyl substances (PFAS). EPA finalized that rule on April 10, 2024, and the case is before a three-judge panel of the D.C. Circuit. This article does not predict how it will come out.
For your own home, keep the two decisions separate. Cleaning the aerator is a maintenance task that you can do this week. Choosing a test and reading its results is a separate job, and any treatment choice should follow from lab data rather than from a headline or a clogged faucet.