Valley tap water runs hard, commonly in the range of ten to twenty grains per gallon depending on which utility serves your street. The city publishes current figures in its annual water quality report, and the USGS hardness scale puts anything past about ten grains into the very hard band. That is dissolved calcium and magnesium, and every time water in your house sits still, gets hot, or evaporates at an opening, some of it comes out of solution and stays behind. The result is that a single cause produces five or six complaints that sound completely unrelated, and homeowners search for them one at a time. Low shower pressure, a toilet that refills on its own, a faucet that will not shut off cleanly, and glass that stops responding to cleaner are usually the same story at different fixtures.
If one fixture lost pressure, the problem is at that fixture, and it is almost always the aerator or the showerhead first and the cartridge second. If every fixture in the house lost pressure at the same time, stop working on fixtures and look at the pressure regulator and the main shutoff instead. And if a shutoff valve under a sink will not turn by hand, leave it alone. Forcing a seized angle stop is the most common way a fifteen minute job turns into a wet floor.
Where scale actually collects
Scale does not build evenly through your plumbing. It builds where the conditions favor it, which is why failures cluster in predictable places: at aerators and showerheads where water hits air, inside toilet tanks where water sits for hours, at rubber parts that scale makes stiff, in valves that have never been turned, and along the bottom of a water heater where the mineral drops out as the water heats.
What that means practically is that most hard water problems in a Phoenix house are solved at the fixture, with parts costing very little, and almost none of them are solved by touching a pipe.
One faucet slowed down
Unscrew the aerator at the tip of the spout. If you find white chalky grit on the screen, that was your pressure. Soak it in white vinegar for half an hour, brush the screen, reassemble. If flow is still weak with the aerator removed entirely, the restriction is further back, usually the cartridge or the supply stop under the sink.
One useful split: if only the hot side is slow, the restriction sits on the hot path, which points at the stop or the water heater side rather than the faucet body.
The shower that lost its pressure
Same order. Showerhead first, because the small outlet holes scale from the outside in and a soak plus a pin through each hole restores most heads. If the head is clear and flow is still poor, the shower cartridge is next. On pressure balance valves, the balancing spool inside can scale and stick, which shows up as weak flow that also goes cold when someone runs water elsewhere.
What it is very rarely in a slab home is the pipe itself, so be skeptical of any conversation that starts at repiping before anyone has opened the valve.
The toilet that runs on its own
Two different failures that sound alike. A flapper stiffened by mineral no longer seals, water leaks past into the bowl, and the tank refills for thirty seconds every few minutes with nobody in the room. A scaled fill valve instead hisses, takes a long time to shut off, or never quite shuts off.
To tell them apart, put a few drops of food coloring in the tank and leave it alone for fifteen minutes without flushing. Color in the bowl means the flapper. No color but a cycling refill means the fill valve. Both are inexpensive parts, and both fail noticeably faster here than the packaging assumes.
The valve under the sink that will not turn
This is the one worth taking seriously. Multi turn angle stops that were installed with the house and never closed since will seize, and the stem packing dries out. People discover this at the worst possible moment, midway through their own faucet swap, and the instinct is to put a wrench on it and push. That is how the stem snaps with the water on.
If a stop resists a gentle quarter turn, that stop is now the job. Replacing it is standard work and usually a good idea anyway while the water is off at the main.
Glass, tile and grout that stopped responding
Two different things look identical from across the bathroom. Mineral film sits on top of the glass and comes off with an acidic cleaner and effort. Etching is microscopic pitting where scale has been sitting through years of heat, and no cleaner reverses it, because the surface itself is damaged. The test is simple: if a section cleans up bright with an acid cleaner and stays that way, it was film.
Grout behaves similarly. Once it is absorbing water rather than shedding it, cleaning is temporary and sealing after a proper clean is what changes the outcome.
The five minute check
- Decide whether it is one fixture or the whole house. That single answer splits the job in half.
- At the affected fixture, test hot and cold separately. A side that behaves differently tells you which path is restricted.
- Unscrew the aerator or showerhead and look for chalky white grit on the screen.
- For a running toilet, food coloring in the tank, fifteen minutes, then look in the bowl.
- Try each angle stop with a gentle quarter turn. If it resists, stop and note it.
- Read the label on the water heater for its build date, and listen for rumbling or popping while it heats.
- If you have a pressure gauge, thread it onto a hose bib. Anything over about eighty psi is working against every fixture in the house.
| Symptom | Likely cause | Typical repair |
|---|---|---|
| One faucet weak on hot and cold | Scaled aerator | Clean or replace the aerator |
| One faucet weak on hot only | Restriction on the hot path | Service or replace the stop, check the heater side |
| Shower weak, tub spout fine | Showerhead or shower cartridge | Descale the head, replace the cartridge |
| Toilet refills every few minutes by itself | Flapper stiffened by mineral | Replace the flapper |
| Toilet hisses or is slow to shut off | Scaled fill valve | Replace the fill valve |
| Every fixture weak at once | Pressure regulator or partly closed main | Test pressure, replace the regulator |
| Shower glass stays cloudy after cleaning | Film on top, or etching in the surface | Acid clean for film, replacement for etching |
| Water heater rumbles when it heats | Sediment on the bottom | Flush, and evaluate its age |
What might get referred out
Swapping aerators, showerheads, cartridges, flappers, fill valves, supply lines, angle stops, faucets, hose bibs, disposals and similar fixture level work is standard under the Arizona handyman exemption, and it covers the large majority of what is on this page.
Some situations might turn out differently once someone can see the fixture. Work inside a wall or under the slab, repiping, gas connections, water heater replacement, sewer and drain line work beyond a simple clear, and installing whole house treatment can carry permit and licensing requirements, and those would go to a licensed specialty contractor. A leak that has been running behind a wall or under a cabinet may also bring a remediation question with it, and the drywall repair afterward is a separate piece of work. None of that can be decided from a description. The handyman makes the call on inspection and tells you before any work starts.
Softeners, filters and what each one actually does
Worth being precise, because these get mixed up constantly. A softener exchanges the calcium and magnesium out of the water, which stops new scale from forming. It does not reverse the scale already inside your fixtures and it does not repair glass that is already etched. Salt free conditioners do not remove hardness at all. They alter how the mineral crystallizes so it is less likely to stick, which is a different claim than softening. Reverse osmosis at the kitchen sink is about what you drink, not about scale in the shower.
So treatment is a decision about the next ten years. The fixtures you have now still need the repairs they need.
What to clean and what to just replace
- Worth cleaning: aerators, showerheads, sprayer heads, and glass, all of which come back well with a vinegar or acid soak.
- Worth replacing outright: flappers and fill valves, which cost little and fail again quickly once scale has worked on the rubber.
- Worth replacing while the water is already off: multi turn angle stops that have never been closed, swapped for quarter turn stops so the next repair is simple.
- Worth evaluating rather than cleaning: a heavily scaled cartridge in a valve that is more than ten or fifteen years old, where parts availability matters as much as the scale.
If you would rather hand it off, say which fixture, whether it is hot, cold or both, what you have already tried, and whether the shutoff under it turns. That detail goes to the handyman with the request, so they arrive with the right cartridge or the right stop rather than making a second trip for parts.
Related notes: which cracks are cosmetic, sun damage on the west side, and sticking doors in monsoon season.
Where this comes up: angle stops and disposals in the 2000s-era homes around Gilbert and Chandler, and fixture work from Old Town out to Vistancia in Peoria.
Questions
I soaked the showerhead in vinegar and it is still weak. Now what?
Take the head off entirely and run the shower for a second. If flow is strong with the head removed, the head is still the problem and it is time to replace it. If flow is weak with nothing attached, the restriction is in the valve, which means the cartridge or the balancing spool.
Is low water pressure a sign my pipes need replacing?
Rarely, and almost never when it is one fixture. Whole house pressure loss usually traces to the pressure regulator or a main valve that is not fully open. Repiping is a real fix for a real problem, but it is a long way down the list from where most of these start.
How often do toilet parts fail here?
Faster than the box suggests. Flappers and fill valves that are rated for years of service tend to have a shorter working life in hard water, so a toilet that starts phantom flushing a few years after the last repair is behaving normally for the Valley rather than telling you something is wrong with the toilet.
Will a water softener clean up my shower glass?
It will stop it getting worse. Film that is already on the glass still has to be removed, and etched glass does not come back at all, because the damage is in the surface rather than on it.
What should I include when I send a request?
The fixture, whether the problem is on hot, cold or both, whether other fixtures are affected, what you have already tried, and whether the shutoff valve under the fixture turns freely. Photos of the fixture and the stop underneath cover the rest.