Dallas, Texas
Dallas, TX Water Quality
Seven lakes and river sources, no wells, and chloramine disinfection. Here is what the City of Dallas 2025 report shows.
All surface water · chloramine avg 2.97 ppm · TTHM 19.7 ppb (limit 80) · no known lead service lines.
The short answer
Dallas Water Utilities draws only surface water, from the Elm Fork of the Trinity River and six reservoirs, and treats it at three plants. TCEQ rates the system Superior.
What you notice at the tap is chloramine, which averaged 2.97 ppm in 2025. Disinfection byproducts were low, lead was 1.1 ppb at the 90th percentile, and the City's inventory lists no known lead service lines. The report doesn't give a hardness figure, so test that at your tap.
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Tell us your Dallas address. We confirm coverage first, then schedule a licensed technician to test at your tap — no charge, no obligation.
What filtration does — and does not
Carbon, catalytic carbon and reverse osmosis solve different problems. Dallas's report points at chloramine first.
Where Dallas water comes from
One river fork, six reservoirs, three plants. No wells.
Elm Fork of the Trinity
The Elm Fork of the Trinity River is one of the seven sources named in the 2025 report. Dallas uses surface water only, with no wells.
Six reservoirs
Lakes Ray Roberts, Lewisville, Grapevine, Ray Hubbard, Tawakoni and Fork make up the rest of the supply listed in the report.
Three treatment plants
All three plants are optimized under the Texas Optimization Program and the Partnership for Safe Drinking Water, according to the report.
What the 2025 Dallas report actually says
Limits are fixed. Results are system figures from the City of Dallas Water Quality Report 2025, not a reading at your tap.
Chloramine 2.75–3.18 ppm
Dallas disinfects with chlorine and ammonia, which form chloramine. Total chlorine residual averaged 2.97 ppm in 2025, under the 4 ppm maximum residual disinfectant level.
Low disinfection byproducts
The highest running annual average was 19.7 ppb for total trihalomethanes (limit 80) and 15.1 ppb for haloacetic acids (limit 60).
Lead 1.1 ppb at the 90th percentile
In 2024 tap sampling, no site exceeded the 15 ppb action level. Copper was 0.39 ppm at the 90th percentile, against a 1.3 ppm action level.
Fluoride and nitrate
Fluoride averaged 0.627 ppm (limit 4) and nitrate 0.671 ppm (limit 10). Both are well under their limits.
Cyanide well under its limit
Cyanide averaged 45.2 ppb with a maximum of 76.8 ppb, against a 200 ppb limit. The report lists it with other inorganic results.
Hardness is not in the report
The 2025 report doesn't list a hardness figure. If scale on fixtures is your concern, test hardness at your own tap before sizing a softener.
Dallas next to Houston and Austin
Houston blends two rivers with 104 deep wells, and its Main System reported two violations in 2025. Austin draws from one river system through Lake Travis and Lake Austin. Dallas uses lakes and the Elm Fork only. All three disinfect with chloramine.
Dallas's byproduct numbers stand out. Its highest running annual average for total trihalomethanes was 19.7 ppb, against Houston's 43.6 ppb and an 80 ppb limit. DWU also describes its water as non-corrosive.
Further south, San Antonio is the opposite case: mostly groundwater from five aquifers, disinfected with free chlorine.
Where these figures come from
Everything on this page traces to Dallas Water Utilities.
- City of Dallas — Water Quality Report 2025 (PDF) — sources, the 2025 data table, lead and copper, and the service line inventory.
- Dallas Water Utilities — Water quality information — treatment chemicals, chloramine, and the free 3-1-1 water test.
Matching treatment to the finding
Dallas's report supports chloramine reduction. Softening depends on a hardness test at your tap, because the report doesn't give one.
Catalytic carbon for chloramine
Standard carbon handles chlorine well but chloramine slowly. A whole-house catalytic carbon system is the usual answer to chloramine taste and smell.
Test before you soften
Dallas doesn't publish hardness in its annual report, so a tap test decides whether a softener is worth it for your house.
Reverse osmosis at the sink
An under-sink RO system certified for what you care about adds a drinking-water stage. The 2025 results don't call for one against any single health contaminant.
Check your own plumbing
DWU's inventory lists no known lead service lines, but the private side of the line and the plumbing inside the house belong to the owner.
How the free test works
A licensed technician tests at your kitchen tap, walks the plumbing, and tells you which of the findings above applies to your house and which does not. There is no charge and no obligation.
Seamless Home is the licensed contractor of record on the work that follows. Installation is performed by vetted installing partners engaged as our subcontractors, and the workmanship obligation stays with us. Coverage is confirmed per service area rather than promised as blanket availability.
What a water treatment job with us covers
Installation and replacement of whole-home and point-of-use treatment, specified against what your water actually contains.
Sediment filtration
Installation of the first stage that protects everything downstream of it, sized to the service line and the household draw.
Softening
Installation of ion-exchange softening where hardness is the problem, including the drain connection the plumbing code treats as indirect waste.
Carbon filtration
Installation of carbon stages for taste, odour and disinfection by-products, specified from your utility's own water quality report.
Reverse osmosis
Point-of-use installation at the kitchen sink where the target is dissolved solids rather than whole-home flow.
Disinfection
Installation of UV or equivalent treatment where the supply is a private well or is otherwise not continuously disinfected.
System replacement
Replacing equipment that has reached the end of its service life, including the discharge and air gap details an inspector looks at.
This is installation and replacement work, specified from a published water quality report or a test of your supply — not from a sales chart. Coverage is confirmed per service area rather than promised as blanket availability.
What the work actually looks like
Treatment equipment is plumbing. Most of the job is the connection, the drain and the code detail behind it.
Dallas water, answered plainly
Where does Dallas get its water?+
From seven surface sources: the Elm Fork of the Trinity River and lakes Ray Roberts, Lewisville, Grapevine, Ray Hubbard, Tawakoni and Fork. Dallas Water Utilities says it does not use groundwater.
Does Dallas use chlorine or chloramine?+
Chloramine. DWU says it combines chlorine and ammonia to make chloramine, and uses ozone at some stages. Total chlorine residual averaged 2.97 ppm in 2025, ranging from 2.75 to 3.18 ppm.
Does Dallas have lead service lines?+
DWU submitted its service line inventory to TCEQ on October 15, 2024, and the 2025 report says the inventory contains no known lead service lines. Lines listed as unknown can be checked through the Customer Service Line Survey at bit.ly/DWULeadInfo.
Is Dallas water hard?+
The 2025 report doesn't give a hardness figure, so we don't quote one. A test at your tap measures it directly.
Is Dallas tap water within federal limits?+
Every regulated result in the 2025 table is under its limit, turbidity met the standard in 100% of months, and TCEQ rates the system Superior. Your own tap can still differ because of the plumbing in your house.
Can I get a free water test from the City?+
DWU's water quality page says you can request more information or a free water quality test by calling 3-1-1. Our free in-home test is separate and also looks at your plumbing and fixtures.
Where do these figures come from?+
From the City of Dallas Water Quality Report 2025 and the Dallas Water Utilities water quality information page. Third-party aggregators are not used.
Related resources
Home water purification and treatment
The national service page behind this one.
Learn more →Houston water quality
Two rivers plus deep wells, and two 2025 violations.
Learn more →Austin water quality
Lower Colorado River water through Lake Travis and Lake Austin.
Learn more →San Antonio water quality
Mostly aquifer water, disinfected with free chlorine.
Learn more →All home services
Water, battery, HVAC and solar under one licensed contractor of record.
Learn more →Get a free test at your tap
A licensed technician tests at your kitchen tap and tells you which findings apply to your house — chloramine, hardness or your own plumbing. No charge, no obligation, and coverage confirmed at your address first.
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