If you live in San Antonio, you’ve probably seen it: chalky white buildup on faucets, cloudy glassware, and shower pressure that slowly drops over time. That’s because San Antonio Water System (SAWS) water is typically hard—about 15 to 20 grains per gallon (gpg), which can lead to mineral scale on fixtures and inside appliances.

So while most people do a home reset in March, February is a smart time to “spring clean” your plumbing—before warmer weather ramps up water use and before scale turns into clogged aerators, inefficient appliances, and pricey repairs.

Below is a simple, homeowner-friendly descaling checklist designed for San Antonio homes.

Hard water minerals (mainly calcium and magnesium) don’t usually create a health issue, but they can build up on surfaces and inside equipment, causing:

• Reduced shower flow and uneven spray
• Stubborn spots on sinks, faucets, and dishes
• Slower-filling washing machines and noisy appliances
• Shorter lifespan for water-using appliances

SAWS notes hard water isn’t a health hazard, but the hardness level in the region is high enough to make scale a common household problem.

Time: 10–20 minutes per faucet
Signs you need this: uneven stream, spray sideways, reduced pressure

Steps

1. Unscrew the aerator (tip of the faucet).
2. Rinse out debris.
3. Soak the aerator in white vinegar for 30–60 minutes.
4. Scrub gently with an old toothbrush.
5. Reinstall and run water for 30 seconds.

Pro tip (San Antonio homes): If multiple faucets have low pressure, do all aerators first—it’s often the fastest fix.

Time: 30 minutes active + 1–8 hours soak
Vinegar soaking is a common, effective way to loosen mineral deposits in showerheads.

Easy method (no removal)

1. Fill a zip-top bag with white vinegar.
2. Slip it over the showerhead so the nozzles are submerged.
3. Secure with a rubber band.
4. Soak 1–4 hours (up to overnight for heavy buildup).
5. Remove, scrub gently, then run hot water for a minute to flush.

Finish warning: Some finishes (certain brass/gold or specialty coatings) can be sensitive—use shorter soaks and avoid abrasive scrubbing.

Time: 10–30 minutes per area
Works well on: chrome, stainless, porcelain (test first)

Steps

• Spray a vinegar-and-water mix (50/50), or apply vinegar on a cloth.
• Let sit 10–15 minutes.
• Wipe, rinse, dry.

Avoid: vinegar on natural stone (like marble/travertine), which can etch—use a stone-safe cleaner instead.

Time: 5 minutes active
Signs: cloudy film on glassware, white residue, funky smell

Simple habit that helps: keep dishwasher salt/rinse aid topped off if your model uses it, and run a periodic cleaning cycle per your machine’s instructions.

If you’re already seeing residue, a dishwasher cleaning/descaling product or manufacturer-recommended cleaner can help remove mineral buildup and restore performance (follow the label and your dishwasher manual).

Time: 5 minutes active
Signs: stiff towels, dingy whites, detergent not dissolving well

Basic refresh

• Run a hot “clean washer” cycle (or hottest cycle) using a machine cleaner that’s compatible with your washer.

Wipe gasket/seals (front-loaders) and clean the detergent tray.

If you have hard water, scale can collect in water heaters over time—especially when maintenance is delayed. A periodic flush (per manufacturer guidance) can help with efficiency and noise.

If you’re not comfortable doing this yourself, this is a great “call a pro” item.

• Weekend 1: kitchen faucet aerators + main showerhead
• Weekend 2: bathroom faucets + secondary showers
• Weekend 3: dishwasher clean cycle + wipe fixtures
• Weekend 4: washer clean cycle + water heater check/flush (if due)

Descaling is a great reset—but if you’re in San Antonio / Bexar County (Stone Oak, Alamo Heights, Helotes, Alamo Ranch, Live Oak, Converse, Schertz, and nearby), the long-term fix is addressing water hardness at the source.

Is San Antonio water considered hard?

Yes—SAWS says typical hardness in their system ranges from 15 to 20 gpg, which is generally considered hard and commonly causes scale.

How often should I descale showerheads in San Antonio?

If you’re noticing reduced flow, mineral crust, or uneven spray, monthly to every couple months is common in hard-water areas.

Descaling helps—but why do deposits keep coming back?

Because hardness minerals are still in the water. Cleaning removes existing scale, but a properly sized water softener helps prevent the buildup from forming as quickly.