Water filtration in Texas: chloramine, carbon filters and reverse osmosis
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A water softener and a water filter solve different problems. Softening handles hardness minerals (calcium and magnesium). Filtration targets other things in the water, such as the disinfectant your city adds or the taste and odor that comes with it. This guide explains the Texas side of that, with sources you can check.
Chloramine: the disinfectant in a lot of Texas city water
Utilities must keep a disinfectant in the pipes all the way to your tap. Some use free chlorine. Others use chloramine, which is chlorine combined with ammonia. The EPA explains how and why utilities use it on its chloramines in drinking water page.
- Austin: City of Austin council documents say the Ullrich Water Treatment Plant, Austin Water's largest, "utilizes chloramine for disinfection" (City of Austin, item 24-4083).
- Houston-area MUDs: Harris County MUD 168 switched from chlorine to chloramine on December 1, 2025, and its FAQ says Houston, Austin and Dallas Water Utilities have used chloramine "for several decades" (Harris County MUD 168).
- Fort Bend County: A Missouri City fact sheet lists Houston, Austin, San Antonio, Dallas and Fort Worth as cities that use chloramine (Missouri City chloramine fact sheet).
Check your own utility. Practice varies by plant and changes over time, and some systems switch between disinfectants for routine maintenance. Your annual water quality report (Consumer Confidence Report) lists the disinfectant residual. See how to read your Texas water report and the TCEQ CCR page. Have a private well? You don't get a CCR, and a city-water chloramine filter is probably not the right tool.
Whole-house carbon vs catalytic carbon
Activated carbon works well on free chlorine. Chloramine is more stable and generally needs catalytic carbon (carbon that's been processed to react faster) and more contact time. That's why chloramine-rated whole-house filters tend to have larger tanks and published flow limits. Practical points:
- Match the filter to your disinfectant. If your CCR says chloramine, look for a filter the maker specifically says handles chloramine.
- Look for certification. NSF/ANSI 42 is the standard for aesthetic effects such as chlorine and chloramine reduction. NSF/ANSI 53 covers health-related contaminant claims. Look up a product's certifications in NSF's certified-product listings, and treat any claim that isn't certified as the seller's own.
- Size by flow, not just bathrooms. Undersized filters have less contact time at high flow.
- Plan for media replacement. Carbon is used up over time, so ask how often the maker expects replacement and what it costs.
SoftPro whole-house carbon options
- SoftPro Chlorine+ Carbon Whole House Filter (city water): an upflow catalytic carbon filter in SoftPro's City Water series. SoftPro markets it for chlorine and chloramine. Listed at $1,097 for the 1.5 cu ft size (1–6 bathrooms) on October 23, 2026.
- SoftPro Fluoride & Chlorine+ SUPER Filter: catalytic carbon plus bone char. Listed from $1,267.
- SoftPro Catalytic Whole House Carbon Filter for Well Water: the well-water version, listed from $1,310. Test your well first.
- Catalytic carbon replacement media (listed at $269) is useful for budgeting long-term cost.
Before you buy, confirm on the product page which contaminants SoftPro says the filter reduces, the service flow rate, and whether those claims are third-party certified.
Reverse osmosis for drinking and cooking water
Reverse osmosis (RO) pushes water through a very fine membrane, usually with sediment and carbon pre-filters and a carbon post-filter. It's normally installed under the kitchen sink and feeds a separate faucet. Things to know:
- RO systems send part of the water down the drain as concentrate. Compare the maker's published drain ratio.
- NSF/ANSI 58 is the standard for RO systems. Check a model's certifications instead of relying on marketing copy.
- Hard water can scale an RO membrane faster. In very hard Texas areas, a softener ahead of the RO is a common setup.
- Pre-filters and membranes need replacing on a schedule, so price those in.
SoftPro's reverse osmosis section currently lists under-sink and countertop RO units sold by SoftPro, plus replacement filters for SoftPro GREEN RO systems ($152). Compare specs and certifications on each listing.
Filtration vs softening: what each does
| Water softener | Carbon / catalytic carbon filter | Reverse osmosis | |
|---|---|---|---|
| Main target | Hardness (calcium, magnesium) that causes scale | Chlorine or chloramine, taste and odor, some organics (per certification) | Broad reduction of dissolved solids at one tap |
| Where | Whole house, at the main line | Whole house, usually before the softener | Point of use (kitchen sink) |
| Removes hardness? | Yes | No | At that tap, yes |
| Removes chloramine? | Not its job | Catalytic carbon rated for it | Its carbon stages help at that tap |
| Ongoing cost | Salt, occasional resin | Media replacement | Filters and membrane |
Many Texas homes on very hard, chloraminated city water use all three: carbon first, then a softener, then RO at the kitchen sink. For softeners, see our SoftPro softener guide (for example, the SoftPro ECO City Water Softener) and Texas hardness by city.
Sources
- US EPA, Chloramines in Drinking Water
- US EPA, Home Drinking Water Filtration Fact Sheet
- City of Austin, Ullrich WTP disinfection conversion, item 24-4083
- Harris County MUD 168, Chloramine Conversion FAQs
- City of Missouri City, Using Chloramines for Disinfecting Drinking Water
- TCEQ, Consumer Confidence Reports
- NSF, Certified products listings
- SoftPro product pages linked above (prices as listed October 23, 2026)
Information only; not plumbing or health advice. For water quality questions, contact your utility.