Chloramine in Fort Bend County water
Some of the county's water systems disinfect with chloramine and some with free chlorine. It changes which filter media makes sense, so here is what each system reported, with the source.
Chlorine and chloramine
Public water systems add a disinfectant so that water stays disinfected on its way through miles of pipe. Two are common. Free chlorine is chlorine on its own. Chloramine is chlorine combined with ammonia; it lasts longer in the pipes and is widely used by systems that treat surface water.
Both are permitted disinfectants with a legal maximum, the Maximum Residual Disinfectant Level, and every annual water quality report must state the residual the system measured. We don't make health comparisons between the two; we read what each system reports and match the filter media to it.
Why systems here are changing
Much of Fort Bend County has drunk well water for a century. Under the regional plan to reduce groundwater pumping, the North Fort Bend Water Authority now supplies treated surface water, largely from the Brazos, to many of the county's districts. Districts that receive it have posted notices that their disinfectant will change from chlorine to chloramine when the surface water arrives.
That is why the tables below are dated. A system's answer can change from one report to the next, and a notice is a plan rather than a measurement.
What each system reported in 2025
Only systems whose 2025 report names the disinfectant are listed, grouped by area. The figures are the report's own residual rows, quoted as labelled, in parts per million or milligrams per liter.
Sugar Land (5)
| System | PWSID | Disinfectant reported | Data year | Source |
|---|---|---|---|---|
| City of Sugar Land | TX0790005 | Chloramine Chloramines (Chlorine): avg 2.74, range 0.5-3.96 | 2025 | 2025 water quality report · checked Nov 2026 |
| City of Sugar Land New Territory | TX0790253 | Free chlorine Chlorine Residual, Free: avg 1.55, range 0.78-1.95 | 2025 | 2025 water quality report · checked Nov 2026 |
| City of Sugar Land Greatwood | TX0790296 | Free chlorine Chlorine Residual, Free: avg 1.59, range 0.87-2.02 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 128 | TX0790498 | Chloramine Chloramine (ppm): avg 2.77, range 0.80-4.50 | 2025 | 2025 water quality report · checked Nov 2026 |
| City of Sugar Land River Park | TX0790354 | Free chlorine Chlorine Residual, Free: avg 1.62, range 0.5-2.15 | 2025 | 2025 water quality report · checked Nov 2026 |
Missouri City / Sienna (16)
| System | PWSID | Disinfectant reported | Data year | Source |
|---|---|---|---|---|
| Fort Bend County MUD 23 | TX0790237 | Free chlorine Free Chlorine (ppm): avg 1.07, range 0.29-3.10 | 2025 | 2025 water quality report · checked Nov 2026 |
| Sienna MUD 10 | TX0790452 | Chloramine Chloramine (ppm): avg 2.75, range 0.70-3.80 | 2025 | 2025 water quality report · checked Nov 2026 |
| Blue Ridge West MUD | TX0790051 | Free chlorine Free Chlorine (ppm): avg 1.95, range 0.72-3.90 | 2025 | 2025 water quality report · checked Nov 2026 |
| Sienna MUD 3 | TX0790376 | Chloramine Chloramine (ppm): avg 2.89, range 0.50-4.20 | 2025 | 2025 water quality report · checked Nov 2026 |
| Sienna MUD 4 | TX0790489 | Chloramine Chloramine (ppm): avg 2.97, range 0.60-4.20 | 2025 | 2025 water quality report · checked Nov 2026 |
| Sienna MUD 6 | TX0790491 | Chloramine Chloramine (ppm): avg 2.51, range 0.50-3.90 | 2025 | 2025 water quality report · checked Nov 2026 |
| City of Missouri City | TX0790345 | Chloramine Chloramine (ppm): avg 2.92, range 0.50-4.00 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 149 | TX0790517 | Chloramine Chloramine (ppm): avg 2.67, range 1.00-4.00 | 2025 | 2025 water quality report · checked Nov 2026 |
| Sienna MUD 12 | TX0790494 | Chloramine Chloramine (ppm): avg 2.7, range 1.20-4.00 | 2025 | 2025 water quality report · checked Nov 2026 |
| Sienna Plantation Management District | TX0790493 | Chloramine Chloramine (ppm): avg 2.83, range 0.80-3.60 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 48 | TX0790267 | Chloramine Chloramines and Free Chlorine (ppm): avg 2.69, range 0.62-4.10 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 47 | TX0790220 | Chloramine Chloramines and Free Chlorine (ppm): avg 2.80, range 0.61-4.80 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 46 | TX0790315 | Chloramine Chloramine (ppm): avg 2.67, range 0.9-3.80 | 2025 | 2025 water quality report · checked Nov 2026 |
| Sienna Management District | TX0790495 | Chloramine Chloramine (ppm): avg 2.64, range 0.60-3.90 | 2025 | 2025 water quality report · checked Nov 2026 |
| Sienna MUD 7 | TX0790492 | Chloramine Chloramine (ppm): avg 2.46, range 1.2-2.6 | 2025 | 2025 water quality report · checked Nov 2026 |
| Sienna Regional MUD | TX0790373 | Chloramine Chloramine (ppm): avg 2.04, range 0.40-3.80 | 2025 | 2025 water quality report · checked Nov 2026 |
Stafford / Meadows Place (1)
| System | PWSID | Disinfectant reported | Data year | Source |
|---|---|---|---|---|
| Fort Bend County WCID 2 | TX0790004 | Chloramine Chloramine: avg 2.5, range 1.2-3.6 | 2025 | 2025 water quality report · checked Nov 2026 |
Richmond / Rosenberg (11)
| System | PWSID | Disinfectant reported | Data year | Source |
|---|---|---|---|---|
| City of Richmond | TX0790023 | Chloramine CHLORAMINE (TOTAL): avg 2.52, range 0.6-3.9 | 2025 | 2025 water quality report · checked Nov 2026 |
| Pecan Grove MUD | TX0790132 | Free chlorine Free Chlorine (ppm): avg 2.41, range 0.80-4.90 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 134D | TX0790562 | Chloramine Chloramine (ppm): avg 1.89, range 0.70-7.20 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 155 | TX0790488 | Chloramine Chloramine (ppm): avg 3.17, range 0.53-5.8 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 152 | TX0790487 | Chloramine Chloramine (ppm): avg 2.94, range 0.40-5.50 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 121 | TX0790393 | Chloramine CHLORAMINE (TOTAL): avg 2.1, range 0.6-3.3 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 134E | TX0790574 | Chloramine Chloramine (ppm): avg 1.68, range 1.00-2.40 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 218 | TX0790582 | Chloramine Chloramine (ppm): avg 3.13, range 0.71-5.30 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 158 | TX0790466 | Chloramine Chloramine (ppm): avg 3.39, range 0.50-5.00 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 253 | TX0790639 | Free chlorine Free Chlorine (ppm): avg 1.6, range 0.62-3.25 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 66 | TX0790486 | Free chlorine Free Chlorine (ppm): avg 3.24, range 1.11-4.50 | 2025 | 2025 water quality report · checked Nov 2026 |
Fulshear (3)
| System | PWSID | Disinfectant reported | Data year | Source |
|---|---|---|---|---|
| City of Fulshear | TX0790133 | Free chlorine Chlorine (Free): avg 2.31, range 0.57-3.90 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 182 | TX0790500 | Free chlorine Free Chlorine (ppm): avg 1.59, range 0.72-2.07 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fulshear MUD 3A | TX0790560 | Free chlorine Free Chlorine (ppm): avg 1.78, range 0.61-4.90 | 2025 | 2025 water quality report · checked Nov 2026 |
Katy / Cinco Ranch / NFBWA area (17)
| System | PWSID | Disinfectant reported | Data year | Source |
|---|---|---|---|---|
| City of Houston | TX1010013 | Chloramine Chloramines (Disinfectant) (ppm): avg 2.8, range 0.04-4.8 | 2025 | 2025 water quality report · checked Nov 2026 |
| City of Katy | TX1010017 | Free chlorine Chlorine (Free): avg 1.12, range 0.60-3.81 | 2025 | 2025 water quality report · checked Nov 2026 |
| Mission Bend MUD 2 | TX1011826 | Free chlorine Free Chlorine (ppm): avg 1.55, range 0.63-2.17 | 2025 | 2025 water quality report · checked Nov 2026 |
| North Mission Glen MUD | TX0790174 | Chloramine Chloramine (ppm): avg 1.51, range 0.60-3.52 | 2025 | 2025 water quality report · checked Nov 2026 |
| Kingsbridge MUD | TX0790158 | Chloramine Chloramine (ppm): avg 2.27, range 0.80-3.70 | 2025 | 2025 water quality report · checked Nov 2026 |
| Weston MUD | TX1010634 | Free chlorine Free Chlorine (ppm): avg 1.11, range 0.42-2.43 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 2 | TX0790038 | Chloramine Chloramines (ppm): avg 3.17, range 0.68-4.90 | 2025 | 2025 water quality report · checked Nov 2026 |
| Grand Mission MUD 1 | TX0790430 | Chloramine Chloramines (ppm): avg 3.12, range 1.66-4.10 | 2025 | 2025 water quality report · checked Nov 2026 |
| Mission Bend MUD 1 | TX1011718 | Free chlorine Free Chlorine (ppm): avg 1.61, range 0.72-3.40 | 2025 | 2025 water quality report · checked Nov 2026 |
| Grand Mission MUD 2 | TX0790449 | Chloramine Chloramines (ppm): avg 3.01, range 1.09-4.10 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 146 | TX0790435 | Chloramine Chloramine (ppm): avg 2.62, range 0.20-6.20 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 190 | TX0790501 | Chloramine Chloramine (ppm): avg 2.91, range 1.07-5.80 | 2025 | 2025 water quality report · checked Nov 2026 |
| Harris Fort Bend Counties MUD 5 | TX0790347 | Free chlorine Free Chlorine (ppm): avg 1.76, range 0.81-2.59 | 2025 | 2025 water quality report · checked Nov 2026 |
| Grand Lakes MUD 4 | TX0790356 | Chloramine Chloramines (ppm): avg 2.97, range 0.67-4.00 | 2025 | 2025 water quality report · checked Nov 2026 |
| Grand Lakes MUD 1 | TX0790410 | Chloramine Chloramines (ppm): avg 2.96, range 0.54-3.99 | 2025 | 2025 water quality report · checked Nov 2026 |
| Grand Lakes MUD 2 | TX0790387 | Chloramine Chloramines (ppm): avg 3.00, range 0.81-4.10 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 206 Victorian Garde | TX0790548 | Chloramine Chloramine (ppm): avg 3.07, range 1.26-6.90 | 2025 | 2025 water quality report · checked Nov 2026 |
Systems not yet assigned to an area (12)
Other / area not assigned (12)
| System | PWSID | Disinfectant reported | Data year | Source |
|---|---|---|---|---|
| Fort Bend County MUD 25 | TX0790130 | Free chlorine Free chlorine: avg 1.67, range 0.55-2.3 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 116 Canyon Gate | TX0790367 | Free chlorine Free Chlorine (ppm): avg 2.11, range 0.90-4.10 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 129 | TX0790437 | Chloramine Chloramine (ppm): avg 2.63, range 0.50-4.00 | 2025 | 2025 water quality report · checked Nov 2026 |
| Plantation MUD | TX0790112 | Free chlorine Free Chlorine (ppm): avg 1.74, range 0.50-3.96 | 2025 | 2025 water quality report · checked Nov 2026 |
| Brazoria - Fort Bend Counties MUD 3 | TX0790597 | Free chlorine Free Chlorine (ppm): avg 1.6, range 0.68-2.50 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 131 | TX0790450 | Free chlorine Free Chlorine (ppm): avg 1.67, range 0.78-2.10 | 2025 | 2025 water quality report · checked Nov 2026 |
| Willow Point MUD | TX0790550 | Free chlorine Free Chlorine (ppm): avg 1.8, range 0.93-2.20 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 115 Riverstone | TX0790403 | Chloramine Chloramine (ppm): avg 2.47, range 0.38-3.50 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 192 | TX0790553 | Free chlorine Free Chlorine (ppm): avg 1.57, range 0.62-2.40 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 198 | TX0790601 | Free chlorine Free Chlorine (ppm): avg 1.50, range 0.52-2.10 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 188 | TX0790614 | Free chlorine Free Chlorine (ppm): avg 1.39, range 0.80-4.00 | 2025 | 2025 water quality report · checked Nov 2026 |
| Fort Bend County MUD 246 | TX0790609 | Free chlorine Free Chlorine (ppm): avg 1.9, range 0.55-4.60 | 2025 | 2025 water quality report · checked Nov 2026 |
Don't see your system? We haven't verified it yet, so check your own report. Find it with EPA's report search
Posted conversion notices
These districts have posted notices of a change to chloramine. Their 2025 reports predate the date in the notice or do not name the type, so we state the notice, not a completed change.
- Cinco MUD 14 (TX0790422) posted a notice: “"On June 30, 2026, Cinco MUD 14 water system will begin receiving surface water from the NFBWA"; disinfectant to change from chlorine to chloramines”. Source · Checked November 5, 2026
- Cinco MUD 7 (TX0790343) posted a notice: “Notice of conversion to chloramine disinfection (NFBWA), on/after June 30, 2026”. Source · Checked November 5, 2026
- Cinco MUD 9 (TX0790307) posted a notice: “Notice of conversion to chloramine disinfection (NFBWA), on/after June 30, 2026”. Source · Checked November 5, 2026
- Cinco MUD 6 (TX0790316) posted a notice: “Post titled "Notice of Conversion to Chloramine Disinfection - NFBWA - Cinco 6" listed in related posts (full text not opened; single source)”. Source · Checked November 5, 2026
- Cinco MUD 5 (TX0790291) posted a notice: “"On or after June 30, 2026" change from chlorine to chloramines before receiving NFBWA surface water later in 2026 (posted June 10, 2026)”. Source · Checked November 5, 2026
- Cinco MUD 12 (TX0790344) posted a notice: “Notice of conversion to chloramine disinfection (NFBWA), on/after June 30, 2026”. Source · Checked November 5, 2026
Temporary free-chlorine periods
A chloramine system may switch to free chlorine for a few weeks of maintenance, often called a burn. Texas does not require customer notice for a temporary free-chlorine period, so a system that uses chloramine can be delivering free chlorine for a while without an announcement. Some post one anyway.
- City of Sugar Land main system (TX0790005) posted temporary free-chlorine periods from April 8 to May 6, 2025 and from April 7 to May 5, 2026. Fort Bend County MUD 128 (TX0790498), which receives Sugar Land water, reposted the notice. Notice
- Fort Bend County MUD 47 (TX0790220) posted temporary free-chlorine periods from October 14 to November 22, 2024 and from March 4 to May 1, 2025. Notice (PDF)
- Fort Bend County MUD 48 (TX0790267) posted a temporary free-chlorine period from March 4 to May 1, 2025. Both MUD 47 and MUD 48 report a combined "Chloramines and Free Chlorine" row in their 2025 reports. District page
What this means for a filter
The practical point is the media. Whole-home carbon filters are commonly used for chlorine or chloramine taste and odor, and systems that disinfect with chloramine generally call for a different carbon than those using chlorine alone. Reverse osmosis membranes are sensitive to disinfectants, so the pre-treatment ahead of the membrane depends on the same answer.
We confirm your system's disinfectant from its report before we quote either. We don't publish removal percentages for any product.
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Tell us your water system and what you're noticing. We'll confirm the disinfectant from its report and quote the right media.