Water softener installation in San Antonio, TX: what's really in your water
Edwards Aquifer water: hard and mineral-rich.
San Antonio's water comes mostly from aquifers, including the Edwards, and runs about 10.5 grains of hardness. Here's what that means for your home.
- Licensed San Antonio plumbers
- Flat prices
- 30-day money-back guarantee
Want the answer for your home?
Tell us your ZIP code and a rep calls you within 5 minutes to answer every question. No pressure, no sales visit.
You're probably on this page because:
- Every faucet has white scale
- Your water heater gave out early
- Your glasses are always spotty
That's Edwards Aquifer water. It's fixable.
What hard water looks like
Crusty shower head. White buildup clogs the spray.
Faucet scale. Comes right back after you scrub.
Cloudy glasses. Even right out of the dishwasher.
Hard water stains on glass. That foggy film that won't wipe off.
See 2 or more? Your water is hard.
Hard water, by the numbers
- About 156 pounds of rock a year: what a family of 4 runs through its pipes at 10 grains of hardness. About 250 pounds in very hard water.
- Up to 48% less efficient: gas water heaters on hard water in testing.
- 1 in 3 homeowners replaced appliances or fixtures because of buildup.
Sources: 300 gal/day × grains × 64.8 mg × 365; WQRF and Battelle; Morton Salt survey via the Philadelphia Inquirer.
Why San Antonio water is so hard
SAWS, San Antonio's water system, gets its water mostly from underground: the Edwards, Carrizo and Trinity aquifers. The Edwards is a limestone aquifer, and water moving through limestone dissolves calcium and magnesium on its way to your tap. (SAWS 2026 Water Quality Report)
The result: about 10.5 grains per gallon, firmly hard. San Antonio's hardness is a big reason softeners are so common in the area.
SAWS reported no violations in 2025. The water is safe. It's just hard.
Lead line checks and chlorine
SAWS is offering a free water service line inspection for eligible customers as part of its lead service line work. If your home is older, it's worth taking them up on it.
SAWS disinfects with free chlorine, not chloramine, which standard carbon handles well. So the fix here is mostly about hardness: a softener sized for 10.5 grains, with carbon in front to protect the resin and take out the chlorine taste.
For a family of 4 at San Antonio's hardness, that usually means a 48,000 grain softener.
Best setup for San Antonio homes
- City Water System: $2,950 installed. Softener for hardness, carbon for the disinfectant, RO for drinking water
Life with it vs. without
| Without it | With it |
|---|---|
| Spots, scale or that pool taste | Clean, soft-feeling water |
| Guessing what you need | A system matched to San Antonio water |
How we work, start to finish
- 1
You reach out or book online
- 2
A rep calls you, usually within 5 minutes, to confirm your system and answer questions
- 3
We schedule a licensed local plumber, usually within a week
- 4
Install day: a few hours, plus a before-and-after water test
- 5
After that: new filters every 6 months if you subscribe
Water advice built on local data
20+ years in water, and every city page starts from that city's own water reports.
- 20+ years in water
- Our own patents
- We supply other water companies
- [Thousands] of systems sold
- Licensed installers
Written by [Name], [title], [20+] years in water treatment. Reviewed by [Licensed plumber name], license # [#]. Last updated [date]. Sources: listed under each "By the numbers" block and linked in the copy
More TX Cities
Related Pages
Questions people ask
How hard is San Antonio water?
About 10.5 grains per gallon, hard.
Does SAWS use chlorine or chloramine?
Free chlorine.
Do I need a softener in San Antonio?
At 10.5 grains, almost always.
What size softener for San Antonio?
Usually 48,000 grain for a family.
Does SAWS check for lead lines?
Yes, free inspections for eligible customers.
Which areas do you serve?
[List areas.]