Why Is My Tap Water Cloudy? 5 Causes & Easy Fixes

Cloudy tap water is almost always caused by tiny air bubbles trapped in the water — a harmless condition that clears up on its own within 30 seconds to a few minutes when you let a glass sit on the counter.

This white, milky appearance happens when dissolved air comes out of solution as water travels through your pipes, particularly when there's a pressure change or temperature difference. In rare cases, cloudy water can signal sediment buildup, hard water minerals, or a problem with your water heater — but the simple "glass test" will tell you immediately which issue you're dealing with.

Why Does Tap Water Turn Cloudy or Milky?

The white, cloudy appearance in your tap water is caused by microscopic air bubbles suspended throughout the liquid — the same phenomenon that makes a freshly poured glass of soda look hazy before the bubbles rise and escape.

When water sits in municipal pipes under high pressure, it can hold more dissolved gases (primarily oxygen and nitrogen) than water at normal atmospheric pressure. The moment you open your faucet and release that pressure, those gases come out of solution and form millions of tiny bubbles. These bubbles scatter light in every direction, making the water look white or milky instead of clear.

Think of it like opening a bottle of sparkling water. The liquid looks cloudy for a moment because the dissolved carbon dioxide is rapidly forming bubbles. Your tap water does the same thing with regular air.

"Cloudy water, also known as white water, is caused by air bubbles in the water. It is completely harmless." — Water Quality Association at WQA Consumer Resources

The cloudiness typically starts at the bottom of the glass and clears upward as bubbles rise to the surface and escape. If your water clears from the bottom up within a minute or two, you have nothing to worry about — the water is perfectly safe to drink.

How Do You Test Whether Cloudy Water Is Safe?

Fill a clear glass with the cloudy water and set it on your counter for 60 seconds — if the cloudiness clears from the bottom up, you're dealing with harmless air bubbles.

This simple test distinguishes between the three main causes of white or milky tap water:

Run this test with both hot and cold water separately. Many households notice their hot water appears cloudier than cold water, which points to a specific cause you can address.

Also Read: Why Is My Well Water Brown? 5 Causes & How to Fix It

Why Is My Hot Water Cloudy but Cold Water Clear?

Hot water holds less dissolved gas than cold water, so when heated water exits your faucet and cools slightly, the excess air rapidly escapes and creates a dense cloud of tiny bubbles.

This is the most common reason people notice white or milky water only from their hot water tap. Here's what happens inside your water heater: cold water enters the tank under pressure and gets heated. As the temperature rises, the water's ability to hold dissolved gases decreases. When you turn on a hot water faucet, that supersaturated water suddenly depressurizes, and the dissolved air comes rushing out.

Several factors make hot water cloudiness more pronounced:

• High water heater temperature — Water heated above 140°F releases air more dramatically when it exits the tap
• Recently refilled tank — After heavy use, fresh cold water entering the tank introduces new dissolved air
• Older heating elements — Scale buildup can create additional nucleation points where bubbles form
• Pressure-reducing valves — These devices increase the pressure differential, intensifying the bubble effect

If your hot water is consistently much cloudier than cold, check your water heater's thermostat setting. The Department of Energy recommends 120°F, which reduces both energy costs and excessive air release.

"Water heated to higher temperatures has a reduced capacity to hold dissolved gases. When this water is suddenly exposed to lower pressure, the gases come out of solution rapidly." — Environmental Protection Agency at EPA Drinking Water Information

What Causes Cloudy Sink Water in 2026?

Beyond air bubbles, cloudy faucet water can result from municipal main work, seasonal pressure changes, new construction in your area, or sediment disturbances in aging pipes.

Here are the most common causes of white or milky tap water and how to identify each one:

Is Your Water Pressure Higher Than Normal?

High water pressure forces more air into solution. If your home's pressure exceeds 80 psi (pounds per square inch), you'll likely see cloudier water consistently. A pressure gauge that attaches to an outdoor spigot costs under $15 and gives you an instant reading. Pressure above 80 psi also strains your plumbing, so installing a pressure-reducing valve protects your pipes and reduces cloudiness.

Has Your Water Utility Done Recent Main Work?

When crews repair water mains or flush hydrants, they introduce air into the system. You'll often receive a notice, but not always. This type of cloudiness affects your whole neighborhood and typically resolves within a few hours to a day. Run your cold water tap for two to three minutes to help clear air from your internal pipes.

Could Sediment Be Stirring Up Inside Your Water Heater?

If cloudy water comes primarily from your hot water tank and contains tiny white or gray particles that settle to the bottom of a glass, sediment buildup is likely. Minerals naturally present in water — calcium, magnesium, and silica — accumulate at the bottom of water heaters over time. When the tank refills or the heating element cycles on, these particles get stirred up and flow through your hot water lines.

Flushing your water heater annually removes sediment before it becomes a problem. Connect a garden hose to the drain valve at the bottom of the tank, turn off the heating element, and let water flow until it runs clear.

Also Read: Why Is My Water Heater Leaking? 7 Causes & Fixes

Are Hard Water Minerals Making Your Water Appear White?

Hard water contains high concentrations of dissolved calcium and magnesium. While these minerals don't typically make water look cloudy on their own, they can create a faint milky appearance when combined with air bubbles. Hard water also leaves white residue on faucets, dishes, and shower doors.

If you notice scale buildup throughout your home alongside cloudy water, hard water is likely contributing. A water softener removes excess minerals, while a whole-house filtration system addresses both hardness and sediment.

Also Read: Why Is My Water Softener Not Working? 7 Causes & Fixes

Why Is My Cold Water Not Working but Hot Is?

When cold water stops flowing while hot water works fine, a frozen pipe, closed shutoff valve, or clogged aerator on the cold water line is usually responsible — not the same issue that causes cloudiness.

This problem is distinct from cloudy water but often comes up alongside it. Here's how to diagnose:

1. Check the cold water shutoff valve — Under your sink, there should be two valves. Ensure the cold water valve (usually on the right) is fully open.
2. Inspect the aerator — Unscrew the aerator from your faucet and check for debris. Sediment can clog the cold water side exclusively if it entered that specific line.
3. Test other cold water fixtures — If only one faucet is affected, the problem is localized. If all cold water is out, check your main shutoff and look for frozen pipes in winter.
4. Listen for gurgling — Air trapped in pipes can block water flow temporarily. Open the highest faucet in your home to let air escape.

How to Fix Cloudy Tap Water

For air bubble cloudiness, no fix is needed — the water is safe and clears on its own. For sediment or hard water issues, targeted filtration and maintenance solve the problem.

Here's what to do based on your diagnosis:

For Air Bubble Cloudiness (Most Common)

Simply wait. The bubbles dissipate within a minute or two. If the appearance bothers you, fill a pitcher and refrigerate it — cold water holds dissolved gases better, so it stays clear.

For Sediment in Hot Water

Flush your water heater by connecting a hose to the drain valve and releasing water until it runs clear. Do this annually to prevent buildup. If sediment persists, consider replacing the anode rod — this sacrificial component corrodes to protect the tank, but when it fails, corrosion accelerates.

For Hard Water Throughout Your Home

Install a water softener to remove calcium and magnesium through ion exchange. For drinking water specifically, a reverse osmosis system under your kitchen sink provides exceptional clarity. Point-of-use filters on refrigerators and faucets also help — if your refrigerator has a built-in filter, replace it every six months.

For Persistent Cloudiness From Unknown Sources

Request a water quality report from your municipal supplier — they're required to provide one annually. If you're on well water, have it tested by a certified lab. The EPA recommends testing private wells annually for bacteria and nitrates, and every three years for other contaminants.

Also Read: Why Is My Water Yellow? 7 Causes & How to Fix It

When Should You Contact Your Water Utility?

Call your water provider if cloudiness persists beyond 24 hours, affects your entire neighborhood, or comes with an unusual odor or taste.

While air bubbles are harmless, certain situations warrant professional attention:

• Cloudiness that doesn't clear within several minutes
• White particles that settle at the bottom of a glass
• Discoloration (brown, yellow, or gray tints alongside cloudiness)
• Metallic, sulfur, or chlorine odors stronger than usual
• Multiple neighbors experiencing the same issue simultaneously

Your water utility can tell you about recent main breaks, flushing schedules, or treatment changes that might explain temporary cloudiness. They may also send a technician to test your water directly.

In Short

Cloudy, white, or milky tap water is almost always caused by harmless air bubbles that clear within a minute when you let a glass sit. Hot water appears cloudier than cold because heated water releases dissolved gases more dramatically. The glass test — watching whether cloudiness clears from bottom up — tells you instantly if your water is safe. Persistent cloudiness with particles that don't rise may indicate sediment or hard water, which a filter, water heater flush, or softener can resolve.

What You Also May Want To Know

Why Is My Water Coming Out White From the Faucet?

White water coming from your faucet is caused by millions of microscopic air bubbles trapped in the water. These bubbles form when pressurized water exits your pipes and encounters normal atmospheric pressure, forcing dissolved gases out of solution. Fill a glass and wait 30 to 60 seconds — if the white color clears from the bottom up, the water is completely safe to drink.

Can Cloudy Tap Water Make You Sick?

Cloudy water caused by air bubbles poses no health risk whatsoever. The dissolved oxygen and nitrogen that create the cloudiness are the same gases you breathe. However, if cloudiness comes with sediment, unusual odors, or discoloration, have your water tested before drinking it. Municipal water supplies are monitored continuously, but well water should be tested annually.

Why Is Only My Hot Water Milky but Cold Water Is Clear?

Hot water holds less dissolved gas than cold water, so when heated water exits your faucet and begins to cool, excess air escapes rapidly and creates a dense cloud of bubbles. Your water heater's temperature setting affects this — higher temperatures mean more dramatic bubble formation. This is normal and the water remains safe.

How Long Does It Take for Cloudy Tap Water to Clear?

Air bubble cloudiness typically clears within 30 seconds to two minutes. The bubbles rise from the bottom of the glass to the surface and escape into the air. If your water stays cloudy for longer than five minutes or doesn't clear at all, you may be dealing with sediment or mineral particles rather than air.

Should I Install a Filter if My Tap Water Looks Cloudy?

For air bubble cloudiness, no filter is necessary — the water is already safe. For sediment issues, a whole-house sediment filter or point-of-use filter can help. For hard water causing milky appearances, a water softener addresses the root cause. Test your water first to identify what you're actually filtering before investing in equipment.

Reviewed and Updated on May 7, 2026 by George Wright