Texas doesn't have one water profile. Average hardness in 2025 ran from 93 ppm in Austin to 135.5 ppm in Houston's main system, San Antonio's utility describes its typical water as 15 to 20 grains per gallon, and Dallas doesn't list hardness in its report at all. Private wells, which the Texas Commission on Environmental Quality (TCEQ) doesn't regulate as drinking water, are a separate case again. So the brands Texas households compare fall into treatment roles rather than one ranking: local dealer systems from Culligan and Kinetico, online whole-house systems from SpringWell and Aquasana, under-sink reverse osmosis (RO) from brands such as Viomi, iSpring, APEC and Aquasana, and certified pitchers and faucet filters for renters. For drinking water on city supplies, the Viomi V6 PRO is a 600 GPD tankless RO whose 9 stages include carbon for chlorine and odors and a long-acting scale inhibitor, with purified-water TDS shown on its LCD smart faucet.
City Water and Private Wells Start From Different Places
City water. TCEQ oversees public water systems in Texas, and city utilities publish an annual Consumer Confidence Report, the water quality report that summarizes test results and the year each sample was taken. Those reports are your starting point if you're on city water. A report shows system-wide sampling; your home's own plumbing can still change what comes out of the tap.
Private wells. TCEQ states plainly that it "does not regulate private drinking water wells," and that well owners are responsible for maintaining and testing their own water. The Texas Water Development Board adds that some groundwater conservation districts offer well water testing, and TCEQ points well owners to the Texas Well Owner Network for guides and testing programs.
For wells, testing comes before shopping. Texas A&M AgriLife Extension notes that in Texas, RO units are commonly recommended for arsenic, because Texas groundwater often also carries high dissolved solids, sulfates or phosphates. A lab result tells you whether that applies to your well.
Four Texas Utilities, Four Different Starting Points
| Utility (report) | Hardness | TDS | Lead at the tap | |
|---|---|---|---|---|
| Houston Public Works, Main System (2025 report) | 43.5 to 229 ppm, average 135.5 | 146 to 331 ppm, average 260 | 2025 sampling: 90% of samples below 5.1 ppb; none above 15 ppb | Houston guide |
| Dallas Water Utilities (2025 report) | Not in the report | Not in the report | 90th percentile of 1.1 ppb in 2024 sampling, with no site over 15 ppb | Dallas guide |
| Austin Water (2025 report) | 70 to 126 ppm, average 93 (5.4 grains per gallon) | Reported separately in monthly water quality summaries | 2024 sampling: 90% of samples below 1.0 ppb; none above 15 ppb | Austin guide |
| San Antonio Water System (2026 report, 2025 data) | Typically 15 to 20 grains per gallon (SAWS FAQ) | Not in the report; SAWS points to Texas Drinking Water Watch for secondary results | 2024 sampling: 90th percentile 1.6 ppb; no sites above 15 ppb | See the FAQ on softening below |
A grain per gallon equals about 17.1 ppm, according to Austin Water, so San Antonio's typical range works out to roughly 257 to 342 ppm. On the same scale, Houston's average is about 7.9 grains and Austin's 5.4. SAWS adds that "hard water is not a health hazard," which is the right way to read every hardness number in this table: it's about scale, soap and taste.
Both Houston and Dallas disinfect with chloramine (Houston's main system averaged 2.8 ppm; Dallas reported an average total chlorine residual of 2.97 ppm), which is why carbon stages matter for taste in those cities.
Two takeaways for shopping:
- Hardness differs from city to city. Houston's main-system average is higher than Austin's, and SAWS describes a higher typical range still. Scale is a whole-house question.
- Lead results were below the action level in all four. Austin Water confirmed in October 2024 that its public system is free of lead pipes, and Dallas reports no known lead service lines. Individual homes can still differ, since lead can come from service lines and household plumbing.
Match the Concern to the Treatment
| What you're dealing with | Treatment that addresses it | Brand examples | What it won't do on its own |
|---|---|---|---|
| High TDS or salty taste in drinking water | Under-sink RO | Viomi V6 PRO, iSpring RCC7, APEC ROES-50, Aquasana SmartFlow RO | Treats one faucet, not the whole house |
| Scale on fixtures, spotty dishes | Salt-based softener (removes calcium and magnesium) | SpringWell salt-based softener; Culligan and Kinetico dealer systems | Doesn't lower other dissolved solids for drinking |
| Scale, without salt | Salt-free conditioner, designed to reduce scale buildup without removing hardness minerals | SpringWell FutureSoft; Aquasana Salt-Free Water Conditioner | Doesn't soften the water |
| A chlorine or chloramine smell from every faucet | Carbon-based whole-house filter made for chloramine | SpringWell whole-house filter; Aquasana Rhino Chloramines | Not designed to soften water or lower TDS |
| Arsenic, nitrate or fluoride in drinking water | An RO system with documented reduction for that specific contaminant | An RO model matched to your lab result | Treats one faucet, not the whole house |
| Lead from service lines or home plumbing | A filter with documented lead reduction | Pitchers, faucet filters and RO systems with a lead-reduction certification or lab test report | Doesn't replace lead pipes |
| Bacteria in an untested well | Lab test first, then disinfection sized by a professional | Dealer systems with a microbiological claim | Doesn't replace the owner's routine well testing |
Whole-House or Point-of-Use?
A whole-house (point-of-entry) system treats the water feeding the plumbing downstream of where it's installed: showers, laundry, the water heater and the kitchen. Softening or conditioning handles scale, and a carbon system designed for it handles chlorine or chloramine smell in the shower. A point-of-use system treats water at one tap, usually the kitchen sink, and goes deeper on what you drink.
A home can combine the two. A softener or conditioner protects the plumbing, and an under-sink RO handles drinking and cooking water.
Brands to Consider for Texas Water, by Role
Local Dealer Systems: Culligan and Kinetico
Culligan and Kinetico sell through local dealers who test water, recommend equipment, install it and service it. Culligan's Texas offices, Houston and Irving (Dallas) among them, each do in-home water testing, and the brand's under-sink line includes the Aquasential RO. On the Kinetico side, authorized dealers handle the sale, installation and service, and the K5 Drinking Water Station runs without electricity. This route suits well owners, since the dealer builds treatment around the well's lab results.
Online Whole-House Systems: SpringWell and Aquasana
SpringWell sells a whole-house carbon filter for city water, a salt-based softener and the salt-free FutureSoft conditioner, sized by number of bathrooms. Aquasana's whole-house line includes the Rhino Chloramines filter for chloramine and chlorine and a Salt-Free Water Conditioner. These whole-house systems install on the main water line.
Under-Sink RO for Drinking Water
For city-water households focused on drinking and cooking water, an under-sink RO fits the job, and the Viomi V6 PRO is built for that job.
Who it suits. Texas households on municipal water who want RO drinking water from a compact cabinet setup and a faucet that shows what's happening.
What it does. Rated at 600 GPD, the Viomi V6 PRO filters on demand without a tank, through 9 stages, and returns three parts purified water for each part sent to the drain (3:1). Its filtration combines PP cotton (sediment), pre-activated carbon (chlorine and odors), ultrafiltration, the 0.0001-micron RO membrane, bamboo charcoal and post-activated carbon, plus a long-acting scale inhibitor that helps keep scale from building up inside the system. On the LCD smart faucet you see purified-water TDS in real time and the filter life remaining; the Viomi app layers on before-and-after TDS and replacement reminders. Neither cartridge needs tools to swap: the PCB filter is rated for 1 year, the RO filter for 2.
Lead-free materials. Intertek has authorized the NSF/ANSI/CAN 372 mark for the Viomi V6 PRO, certifying the lead content of the materials that touch your water.
Installation conditions. Plan for an outlet that's always live and GFCI-protected (rather than the disposer's switched one), inlet pressure between 14.5 and 72.5 psi, a 1/4" drain-pipe hole, and a faucet hole of 1" to 1.5". The faucet, fittings and tubing come in the box, and a step-by-step installation video covers the Viomi V6 PRO. It's designed for municipal tap water, so it fits homes on city systems like Houston, Dallas, Austin and San Antonio.
Larger households can step up to the Viomi V8 PRO (800 GPD, same 9-stage design), and those who want remineralized water can choose the Viomi M1 (1000 GPD with remineralization), which was tested by SGS for lead reduction above 99.87%.
The other under-sink RO systems in the table take a different approach. The iSpring RCC7 is a tank system that runs without electricity, the APEC ROES-50 uses industry-standard 10-inch prefilters, and the Aquasana SmartFlow RO adds a remineralizer stage to a tank design.
| Under-sink RO | Design | Filter routine |
|---|---|---|
| Viomi V6 PRO | Tankless, 600 GPD, 9 stages, LCD smart faucet | Two tool-free cartridges: PCB 1 year, RO 2 years; filter life shown on the faucet |
| iSpring RCC7 | Tank (3.2 gallons), 5 stages, runs without power | Sediment every 6 months at most; carbon stages yearly at most; membrane every 3 years at most |
| APEC ROES-50 | Tank system, 5 stages, takes standard 10-inch prefilters | Prefilters every 6 to 12 months; on city water, replace the membrane every 2 to 4 years, and the post-filter on the same 2-to-4-year cycle |
| Aquasana SmartFlow RO (AQ-SFRO2) | Tank system, 4 stages, remineralizer included | Claryum and carbon cartridges: 6 months or 250 gallons, whichever is reached first; remineralizer: 6 months; membrane: 12 months |
Pitchers and Faucet Filters
Renters and anyone not ready to install equipment can begin with a pitcher or faucet filter that carries a certification. Among pitchers, the Brita Elite filter (OB06) holds NSF/ANSI 53 lead certification in the Brita pitchers its listing names. On the faucet side, IAPMO R&T certifies the listed PUR faucet systems with the PUR PLUS RF-9999 filter under NSF/ANSI 53 for lead, VOCs, mercury and Total PFAS. Neither changes hardness.
FAQ
I'm on a private well in Texas. What should I do first? Get a lab test. TCEQ doesn't regulate private drinking water wells, so the owner is responsible for testing, and some groundwater conservation districts offer well testing. Build treatment around the result: sediment, iron or bacteria call for pretreatment or disinfection, while for arsenic, Texas A&M AgriLife notes that RO units are commonly recommended. For a private well, start with a dealer who can design treatment around the lab results.
Should I soften my water before adding an under-sink RO? Where the feed water is hard, Viomi's installation guidance adds a prefilter with a scale inhibitor or non-salt-based softener ahead of the RO as needed. Inside the Viomi V6 PRO, one of the 9 filtration stages is a long-acting scale inhibitor as well.
Does a Texas summer change how an RO system performs? The specification table in the Viomi V6 PRO and Viomi V8 PRO manual lists inlet water temperatures of 41°F to 100°F and ambient temperatures of 40°F to 104°F. When summer demand runs high, the tankless Viomi V6 PRO and Viomi V8 PRO produce water as you draw it, with no storage tank to run dry.
Where Texas Households Get Their Own Numbers
On city water, the utility table above links the Houston, Dallas, Austin and San Antonio reports and shows where hardness and TDS figures sit when a report leaves them out: Austin posts TDS in its monthly and quarterly water quality summaries, and SAWS points to Texas Drinking Water Watch for secondary results. Set those local figures against what you notice at the tap, and the treatment table shows which role fits. For contaminants found around the state, our guide to water filter brands for Texas household contaminants goes further. On a private well, the next step is a local lab test: some groundwater conservation districts offer well water testing, and the Texas Well Owner Network, which TCEQ points well owners to, has guides and testing programs.
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