Water Quality Services in San Antonio, TX

Fix What Aquifer Water Does to Your Home

Testing, softening, filtration and reverse osmosis for San Antonio homes on SAWS water or a Hill Country well. Straight answers about what you need and what you do not.

San Antonio Water Quality

Safe Water Is Not the Same as Easy Water

San Antonio tap water is treated, tested and safe to drink. It is also some of the hardest municipal water in Texas, because most of it is pumped from the Edwards Aquifer, a limestone formation that dissolves into the water on its way to your meter. That hardness is what leaves the white crust on the shower door, kills water heaters young, and makes soap feel like it never rinses off. The chlorine that keeps the water safe on its trip through the mains is the other thing people notice, usually as taste and smell at the kitchen tap.

Outside the city, the picture changes. Homes on private wells around Boerne, Helotes and the hills toward the Guadalupe can see even harder water, plus sediment, iron staining or a sulfur smell, and there is no utility treating it before it reaches the house. Those homes need testing before anyone recommends equipment, because the right filter for one well is the wrong one for the well next door.

Our approach is to test first, then match the equipment to the problem: a softener for hardness, carbon filtration for chlorine taste, reverse osmosis at the sink for drinking water, and well-specific treatment where it is needed. The technical comparison of each option lives on our water quality page. What follows is how it plays out in San Antonio homes.

  • Test before we recommend Hardness, chlorine and, on wells, the extras. Equipment is chosen from the numbers, not from a brochure.
  • Only what the water needs A softener does not fix taste, and a carbon filter does not fix scale. We will not sell you the one you do not need.
  • Home Comfort Guarantee Quotes honored for 72 hours, licensed and bonded plumbers, and a 100% satisfaction promise on the install.
Radiant technician greeting a San Antonio homeowner before a water quality visit

What Your Water Is Telling You

Signs of a Water Problem in a San Antonio Home

Each of these points to a different fix. Matching the sign to the equipment is most of the job.

  • Scale on shower glass and faucets

    Hardness. The same deposit is forming inside the water heater and dishwasher. Answer: a softener.

  • Chlorine taste or a pool smell at the tap

    Disinfectant from the municipal system. Answer: carbon filtration, whole-home or at the sink.

  • Cloudy ice and spotted glassware

    Dissolved minerals coming out as the water freezes or dries. Answer: reverse osmosis for the fridge and kitchen tap.

  • Dry skin, dull hair, stiff laundry

    Minerals binding with soap and leaving a film. Answer: a softener, sized to the household.

  • Orange stains or a rotten-egg smell on a well

    Iron and sulfur, common in Hill Country wells north and west of the city. Answer: a well test, then targeted treatment.

  • Appliances that keep dying young

    Water heaters, dishwashers and coffee makers scaled up inside. Answer: stop the minerals at the point of entry.

What We Install and Service

Water Quality Solutions Across the San Antonio Area

From the meter to the kitchen tap, for homes on SAWS water and homes on a well.

Smiling Radiant water treatment technician in front of a Radiant service van in San Antonio
Water softeners, filtration and reverse osmosis systems installed across the San Antonio area.

How It Works

From a Water Test to Better Water

The equipment is the easy part. Getting the diagnosis right is what keeps you from buying twice.

  1. Test the water at your tap

    City or well, we test what actually comes out of your faucet and show you the results.

  2. Match equipment to the problem

    Softener, filter, RO, or a combination. We explain what each will and will not change, and where it would go.

  3. Written quote, your decision

    Honored for 72 hours, no hidden fees, and financing through Service Finance Company if you want to spread it out.

  4. Install, set and retest

    Plumbed in, programmed for your water, and tested again at the tap so you can see the difference in the numbers.

Tired of Fighting the Water?

One test tells us what your San Antonio home actually needs. Then you decide.

What Our Customers Say

Don't just take our word for it — hear from our satisfied customers

J Jeff Fazio
Jeff Fazio 3 years ago
★★★★★
I had Radiant Plumbing replace my tankless water heater, damaged in the Feb. 2021 snowmageddon storm with a new unit. The process was smooth and professional from start to finish. The plumber, James, was extremely knowledgeable and thoroughly explained my options to me. The cost and time to perform the installation were just as estimated. When he was done, James explained how to maintain the system, what service would be needed and how to perform it, and answered all of my engineering geek questions. It was a thoroughly positive experience. I have used several different plumbers in Austin over the past 15 yrs, but my search is over - I will not hesitate to call Radiant next time and would recommend them unreservedly.

8/9/23 Update: I have subsequently used Radiant for a toilet repair, faucet installation (Danny), and drain work (Ezekiel) and they have continued to impress with knowledgeable, friendly plumbers and quality work.
C Cathy McClaugherty
Cathy McClaugherty 5 years ago
★★★★★
We called Radiant Plumbing after we noticed a water leak in our kitchen. We were in a time crunch and they were able to schedule us quickly, before we left for vacation. They sent their representative, Preston Nichols, and he was excellent to deal with! He was on time, skillful, friendly, and very professional. It turned out to be a problem with our dishwasher but Preston was quick to diagnose it and set our minds at ease. While he was here, we mentioned that our one year-old water heater needed to be flushed. Preston was quick to take care of that, as well, saving us time and money in the process. Radiant charged us almost half the price another plumber quoted us for that service! While Radiant Plumbing isn’t our usual plumber, they gained a new customer. We won’t hesitate to call Radiant again in the future based on our VERY positive experience with them.
S Stefano Rosellini
Stefano Rosellini 6 years ago
★★★★★
Had 3 different systems installed by them approx. 3 years ago for a total of approx $20k. I was quite happy with the install until the year later when they came for a maintenance call and started finding deficiencies in their own install. they wanted extra money to address those deficiencies. Now I am in the process of selling my home and an inspector has found a few items that need to be addressed and they will not even look at the report unless I schedule a $139.00 service call. Very poor customer service.. This company does not stand by their work and would not recommend.

I am revising my review of this business from 1 to 5 stars. After my original review I was contacted by the company's service manager and he made sure that I was taken care off. I had a team of 3 technicians coming to my house to double check the system and make the necessary adjustments. I was very satisfied by their attention to details and professionalism.

Maintenance Membership

Join the Care Club

Home maintenance for $9.99 a month.

Care Club members get two HVAC tune-ups and a plumbing safety inspection every year, priority scheduling, no dispatch fees — ever — and 5% off every repair.

  • Priority scheduling
  • Seasonal HVAC tune-ups
  • Annual safety inspection
  • Exclusive member discounts
  • Free dispatch on repairs
  • No long-term contracts

San Antonio Water Quality Questions

Is San Antonio tap water safe to drink, and if so, why treat it?

It is safe. SAWS treats and tests the supply, and the water meets drinking standards. Treating it at home is about comfort and about what the water does to your plumbing, not safety. The hardness that comes with Edwards Aquifer water scales up water heaters, dishwashers and fixtures, and it makes soap and detergent work poorly. The chlorine that keeps the water safe in the mains affects taste. A softener addresses the first problem, carbon filtration the second, and reverse osmosis gives you clean-tasting drinking water at one tap. Which of those you want depends on what bothers you and what you are trying to protect.

What is the difference between a softener, a whole-home filter and reverse osmosis?

They solve three different problems. A water softener swaps the calcium and magnesium that make water hard for sodium, which stops scale throughout the house; it does nothing for taste. A whole-home carbon filter removes chlorine and improves taste and odor at every tap; it does nothing for hardness. Reverse osmosis pushes water through a fine membrane and removes most dissolved minerals and contaminants, but it works slowly, so it is installed at one sink for drinking and cooking rather than for the whole house. Many San Antonio homes end up with a softener plus RO at the kitchen sink. We will tell you which combination your test results actually call for.

Does hard water cost me money, or is it just annoying?

Both, and the money part is larger than most people realize. Scale on the bottom of a water heater insulates the burner or elements from the water, so the heater runs longer to do the same job and wears out years early. Scale inside a dishwasher, washing machine and coffee maker shortens their lives too. Hard water also makes soap and detergent less effective, so you use more of it. Then there is the repair side: fill valves, cartridges and aerators clogged with mineral deposits are a steady share of the plumbing calls we run in San Antonio. Softening the water at the point of entry stops most of that at once.

We are on well water near Helotes. Can you treat that too?

Yes, and wells are where testing matters most. A Hill Country well north or west of San Antonio can be harder than city water and may carry iron, sulfur, sediment or bacteria that SAWS customers never deal with, and no two wells are quite alike. We test for the full picture before recommending anything. The treatment might be a softener alone, a sediment filter ahead of it, an iron filter, or a UV or chlorination stage if bacteria are present. We also look at the pressure tank and the line from the wellhead, since a well system has more places for a problem to hide than a city meter does.

Do I really need a water test first, or can you just install a softener?

We can install one, but a test takes minutes and changes what we would install. Softeners are sized by grains of hardness and household water use, and San Antonio hardness varies by source, by season and by whether SAWS is blending in water from outside the aquifer. An undersized softener regenerates constantly and wastes salt; an oversized one costs more than it should. On a well, skipping the test is how a homeowner ends up with a softener fouled by iron six months later. The test is quick, it is part of the visit, and it means the written quote is for equipment that fits your water, not a guess.

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