How hard the water actually is here, what it does to glass, stone, grout, and fixtures, and the difference between buildup you can remove and damage you cannot.
Water hardness is the amount of dissolved calcium and magnesium in the water, measured in grains per gallon. The USGS considers anything above about 10.5 grains per gallon very hard. Most of the Phoenix metro sits above that line.
The City of Phoenix reported sampled hardness ranging from roughly 9.9 to 16.1 grains per gallon, and independent reporting on Chandler's water puts it around 13 grains per gallon. A plumbing industry summary of hardness by Arizona city lists ranges of roughly 12 to 22 in Mesa, 8 to 23 in Tempe, 12 to 20 in Scottsdale, and around 13 on average in Gilbert.
Those ranges are wide for a reason. Hardness changes with the source, and Valley cities blend groundwater with Colorado River and Salt River water in different proportions depending on the season and the part of town. Your neighborhood may not match the city average, and a private well in Maricopa County can be considerably harder than either.
The practical takeaway: whatever your exact number, it is high enough that every surface water touches in your home is accumulating mineral.
This is where hard water does the most permanent damage. Minerals sit on the glass, and if they sit long enough they bond to it and begin etching the surface. Early buildup cleans off. Late-stage etching is physical damage to the glass and no cleaner fixes it, which is why shower doors eventually get replaced rather than cleaned.
Windows get the same treatment from irrigation. A sprinkler head hitting the same pane twice a day for a year will leave a mark that outlives the landscaping.
Grout is porous, so it absorbs mineral and soap residue rather than just collecting it. That is why grout goes dark and stays dark even after mopping. In showers you get the combination that does the most work: soap, body oils, minerals, and constant moisture in a space that never fully dries.
Travertine, marble, and limestone are calcium based, which means acid dissolves them. Most off-the-shelf hard water removers are acidic. Used on stone, they remove the buildup and part of the stone with it, leaving a dull, rough patch that shows worse than the mineral did. This is the single most common way Valley homeowners damage their own stone.
Scale builds inside water heaters, on shower heads, and around faucet bases. It is cosmetic at the fixture and mechanical inside the appliance, where it reduces efficiency and shortens service life.
There is a line on glass and stone where cleaning stops being the answer. On glass it is etching. On polished stone it is loss of the polished layer. We tell you when a surface is past that line rather than selling you a cleaning that cannot deliver, because the honest version of this service includes saying no sometimes.
Hardness varies by neighborhood and season, so treat these as ranges rather than a number for your address. Your city publishes an annual water quality report if you want the current figure.
Please reach us at (480) 389-8415 if you cannot find an answer to your question.
Hard to very hard almost everywhere. Phoenix has reported sampled hardness in the range of roughly 10 to 16 grains per gallon, and Valley cities generally test in the 12 to 20 range depending on the source and the season. The national average is closer to 7 to 10.
Spotting is mineral sitting on top of a surface and it comes off. Etching is the surface itself being eaten into, usually by acidic cleaners used to fight the spots. Etched glass and etched stone cannot be cleaned back to new, they have to be polished or replaced.
We do not clean or restore shower glass. We clean the tile, stone, and grout around it. For glass we suggest a non-acidic hard water remover, because acid-based products damage the stone and grout right next to the glass.
On grout and stone, yes. A sealer slows how fast minerals and soil work into a porous surface, which makes the next cleaning easier and keeps the surface looking even longer. It is not permanent and it does not make a surface stain proof.
It reduces the source, which helps everywhere water touches. It does not undo mineral buildup that is already bonded to a surface. Existing buildup still has to be cleaned off once.
Most Valley homes do well every 12 to 18 months. Showers and kitchen floors usually need it sooner because of the combination of soap, minerals, and traffic.
Tile and grout from $0.85/sqft online, stone from $1.27. Price it online, or call (480) 389-8415 and describe what you are looking at.