Dallas Water Quality Report 2026: What’s in Your Tap Water
QUICK SUMMARY:
- Overall Rating: Fair
- Top Contaminants of Concern: Disinfection byproducts (trihalomethanes, haloacetic acids, and bromate), hexavalent chromium (chromium-6), and nitrate, with three PFAS compounds detected above health-based guidelines
- Recommended Filter Type: Catalytic carbon for chloramine and disinfection byproducts, or reverse osmosis for the broadest reduction including chromium-6 and nitrate — see the best under sink water filters and best reverse osmosis systems guides
- Water Hardness: Hard — roughly 8–9 GPG (about 140–160 ppm), at the lower end of the hard range
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The Dallas Water Utility serves more than 1.3 million people, which makes it one of the largest drinking water systems in the country. According to the EWG Tap Water Database, the system met all federal health-based standards in the most recent assessment period. That statement is accurate, and it is also incomplete. Federal compliance is a legal threshold, not a measure of how clean the water is. The same dataset shows 38 contaminants in Dallas tap water, 17 of them above the Environmental Working Group’s stricter health-based guidelines.
Here’s what the data actually shows. Twelve of those 17 exceedances are byproducts of the disinfection process itself — the chemistry that makes the water microbiologically safe also creates compounds linked to long-term cancer risk. The distinction matters, and it shapes which filter is worth installing. This report walks through the source water, the specific numbers, the role chloramine plays, and the filtration that fits the city’s profile.
Where Does Dallas Get Its Water?
Dallas is a surface-water city. Its supply is drawn from six regional reservoirs — Lewisville, Ray Roberts, Grapevine, Ray Hubbard, Tawakoni, and Fork — blended with water from the Elm Fork of the Trinity River. That raw water is treated at three plants: Bachman, Elm Fork, and East Side. The city is also developing a connection to Lake Palestine, expected to come online around 2027, which will add a seventh source.
Surface water carries a specific signature. River and reservoir water contains naturally occurring organic matter — decaying vegetation, soil runoff, and algae — along with agricultural and stormwater inputs from a large upstream watershed. When disinfectants are added during treatment, they react with that organic material. Those reactions are the origin of the disinfection byproducts that dominate Dallas’s water profile, rather than any single industrial chemical.
How Dallas Disinfects: Chloramine and Ozone
Dallas does not rely on free chlorine alone. The utility uses ozone as a primary disinfectant at the treatment plant and chloramine — a longer-lasting combination of chlorine and ammonia — as the residual disinfectant that protects the water as it travels through hundreds of miles of pipe to your tap.
This two-part approach has real consequences for what ends up in your glass. Chloramine produces fewer regulated trihalomethanes and haloacetic acids than free chlorine, which is part of why Dallas’s measured trihalomethane level is comparatively low. The trade-off is that chloramine is more chemically stable, which makes it harder to remove — it requires catalytic carbon (a specially processed activated carbon that chemically breaks chloramine apart rather than simply adsorbing it) and longer contact time. The ozone step has its own signature: reacting with bromide naturally present in the source water, it forms bromate, a regulated carcinogenic byproduct that shows up in Dallas’s data. For more on how the two disinfectants behave at the tap, see our guide to chloramine vs chlorine in tap water.
What Contaminants Are in Dallas Tap Water?
The table below uses the most recent EWG Tap Water Database compilation for the City of Dallas system (test results reported through 2024). One column needs explaining before you read it. The EPA’s Maximum Contaminant Level (MCL) is the legal limit — the number a utility cannot exceed without a violation. The EWG Health Guideline is a stricter, health-based benchmark set at a one-in-one-million lifetime cancer risk. The gap between the two is where most of the meaningful risk lives, because the federal legal limits for these contaminants have not been updated in close to twenty years.
| Contaminant | Detected Level | EPA MCL | EWG Guideline | Health Concern |
|---|---|---|---|---|
| Total trihalomethanes (TTHMs) | 14.1 ppb | 80 ppb | 0.15 ppb | Cancer, fetal development |
| Haloacetic acids (HAA5) | 7.46 ppb | 60 ppb | 0.1 ppb | Cancer, reproductive harm |
| Haloacetic acids (HAA9) | 10.9 ppb | — | 0.06 ppb | Cancer |
| Bromodichloromethane | 4.41 ppb | (part of TTHM) | 0.06 ppb | Cancer |
| Bromate | 2.38 ppb | 10 ppb | 0.1 ppb | Cancer |
| Chromium (hexavalent) | 0.275 ppb | 100 ppb (total Cr) | 0.02 ppb | Cancer |
| Nitrate | 0.690 ppm | 10 ppm | 0.14 ppm | Oxygen delivery in infants |
| PFOA | 1.60 ppt | 4 ppt | — | Cancer, immune effects |
| PFOS | 0.792 ppt | 4 ppt | — | Immune, thyroid effects |
Read the trihalomethanes row carefully. Dallas’s measured level — 14.1 ppb — sits well under the EPA’s legal ceiling of 80 ppb. By the federal standard, this is compliant water. Measured against the EWG health guideline of 0.15 ppb, the same number comes in at roughly 94 times the guideline. Both figures are true at once. That is precisely the point where regulators and consumers tend to talk past each other.
The disinfection byproducts deserve the most attention because they account for 12 of the 17 exceedances and because the health endpoint — increased lifetime cancer risk, with some evidence of harm to fetal development — is well characterized in the research. Bromodichloromethane is an individual member of the trihalomethane group, which is why it appears separately above. Bromate is the ozone-derived byproduct described in the previous section; at 2.38 ppb it sits about 24 times the EWG guideline while remaining a quarter of the federal limit.
Hexavalent chromium (chromium-6, the compound made familiar by the Hinkley, California litigation) was detected at 0.275 ppb. There is no separate federal MCL for chromium-6; it is regulated only under the 100 ppb limit for total chromium, which Dallas is far below. Against the EWG health guideline of 0.02 ppb, however, Dallas’s level sits about 14 times higher. For more on this contaminant, see our guide to chromium-6 in drinking water.
Nitrate was detected at 0.690 ppm, roughly five times the EWG health guideline of 0.14 ppm, though far below the federal 10 ppm limit. It is worth singling out because it is one of two contaminants here that activated carbon does not meaningfully reduce, and its presence in an urban system usually traces to upstream agricultural runoff and wastewater discharges into the source watershed. Our nitrate in drinking water guide covers the health context and removal options.
A note on PFAS, since it is the contaminant most readers ask about. Dallas’s monitoring detected three “forever chemicals” — PFOA at 1.60 ppt, PFOS at 0.792 ppt, and PFHxS — above EWG’s health-based guidelines, though the reported PFOA and PFOS levels remain under the EPA’s enforceable 4 ppt limits finalized in 2024. That claim requires context: these levels are low compared with military-base-adjacent communities, but PFAS compounds are persistent and worth reducing. The utility has stated that its Bachman plant is sampling for PFAS and planning treatment, with current results at or below EPA limits. If PFAS is your primary concern, our best water filters for PFAS removal guide covers the certified options.
You can review the full contaminant list for your system at the EWG Tap Water Database entry for Dallas.
The Lead Question in Dallas
Lead deserves its own section because it behaves differently from everything else above. The contaminants in the table arrive at the treatment plant or form during treatment. Lead does not — it enters water after treatment, by leaching from lead service lines, lead solder, and brass fixtures inside older buildings. The water leaving Dallas’s plants is essentially lead-free; what matters is the plumbing between the water main and your glass.
For the 2025 update to its database, EWG noted that it was unable to locate recent lead testing results for the Dallas utility in state or federal databases. That absence is not reassurance — it is a data gap. Lead contamination varies sharply from one neighborhood to the next, driven by the age of the service line and the premise plumbing; lead pipes were common in water lines installed before the 1930s, and lead solder remained legal until 1986.
The practical implication is straightforward. A citywide average cannot tell you what is happening at your specific tap, and for lead, the tap is the only measurement that counts. If your home was built before 1986, testing your own water is the only way to know your exposure. Our lead in drinking water guide covers sources, risks, and removal in detail.
Dallas Water Hardness
Dallas has hard water, though at the lower end of the hard range. Because the supply blends several surface reservoirs, its mineral content sits above a pure mountain-river source but below a mineral-rich aquifer. Reported hardness generally runs about 140 to 160 ppm, or roughly 8 to 9 grains per gallon (GPG) — which falls in the “hard” band on the standard scale (7–10 GPG) and in the USGS “hard” category (121–180 ppm). Some consumer sites describe this as “moderately hard,” but the numbers place it just inside hard.
In practical terms, that level of hardness produces some scale on fixtures and water heaters and reduces soap lather, but it is not severe enough to demand a whole-house softener for most households. If hard-water spotting or scale buildup is a genuine nuisance in your home, our hard water guide and solutions explains the options and when a softener is worth the cost. The more important point for Dallas residents is this: direct your filtration budget at the disinfection byproducts, chromium-6, and nitrate, not at hardness.
Best Water Filters for Dallas Residents
Dallas’s profile points to a clear priority order: reduce disinfection byproducts and chloramine first, then address the two contaminants carbon cannot handle — chromium-6 and nitrate. The three options below are matched to that profile. Each carries third-party certification (WQA or IAPMO) to a specific NSF/ANSI standard — verify the exact model in the certifier’s database before buying, since certification is listed by model, not by brand.
Under Sink: Aquasana Claryum 3-Stage Max Flow
A catalytic carbon-block under-sink system is the most direct answer to Dallas’s dominant problem. The Aquasana Claryum 3-Stage Max Flow is certified by the Water Quality Association (WQA, an accredited body that certifies to the NSF/ANSI standards) to Standards 42, 53, and 401 — covering chlorine and chloramine taste, lead, and a range of organic compounds, the category that includes the precursors and byproducts of disinfection. Because Dallas uses chloramine as its residual disinfectant, the chloramine-reduction certification matters here in a way it would not in a free-chlorine city. The system installs at a single tap and delivers a higher flow rate than reverse osmosis, so it does not slow your kitchen faucet to a trickle.
Two real limitations. First, activated carbon is not the right tool for hexavalent chromium or nitrate; it reduces neither reliably, so if those two contaminants are your priority, this is not the unit to choose. Second, the cartridges are rated for roughly 600 to 800 gallons or about six months, and replacements run on the higher side per gallon than a basic carbon filter — budget for that recurring cost. Wirecutter and the WQA certified-product listing both confirm Aquasana’s certification claims, which is more than can be said for many carbon systems marketed with “tested to NSF standards” language but no actual certification.
Buy Direct from Aquasana | Check on Amazon
Reverse Osmosis: Waterdrop G3P800
Reverse osmosis is the strongest match for Dallas specifically, because it is the only technology that addresses every contaminant in the table at once — disinfection byproducts, bromate, hexavalent chromium, nitrate, and PFAS. The two contaminants that defeat a carbon filter, chromium-6 and nitrate, are exactly the ones reverse osmosis handles well. The Waterdrop G3P800 holds NSF 58 certification for TDS reduction and NSF 372 certification for lead-free construction. Independent testing by IAPMO confirmed PFOA and PFOS reduction performance, but the membrane itself is not separately NSF 53 certified for PFAS. Its tankless design recovers water more efficiently than older tank-based units and fits under a standard sink.
The trade-offs are inherent to the technology, not flaws in this model. Reverse osmosis strips minerals along with contaminants, so the water tastes flat to some people, and the system sends a portion of feed water to the drain (the tankless design reduces, but does not eliminate, this waste). It also needs an electrical outlet under the sink and produces filtered water more slowly than a carbon system. Consumer Reports’ filter testing consistently ranks reverse osmosis highest for breadth of contaminant removal — the reason to accept those trade-offs in a city where chromium-6 and nitrate both exceed health guidelines. For model comparisons, see our best reverse osmosis systems guide.
Buy Direct from Waterdrop | Check on Amazon
Budget Pitcher: ZeroWater 10-Cup Ready-Pour
For renters or anyone not ready to install hardware, a high-reduction pitcher is a reasonable entry point. The ZeroWater 10-Cup Ready-Pour is certified by IAPMO — an accredited certification body that tests to the NSF/ANSI standards — to NSF/ANSI 53 for lead and chromium reduction, with newer 10-cup models also listing PFOA and PFOS reduction under NSF/ANSI 53. Its ion-exchange resin also reduces nitrate, which matters in Dallas because nitrate is one of the contaminants a standard carbon pitcher leaves behind. Verify the specific model’s certification in the NSF or IAPMO database before buying, since the listings are model-specific.
The honest weaknesses are about taste and maintenance. ZeroWater removes so much that the resulting water can taste flat or faintly metallic, and the filters need replacing once the included meter reads 006 — a threshold that arrives sooner in Dallas’s moderately hard, higher-TDS water than in a soft-water city. Filtration is also slow. A filter your household will not drink from protects no one, so take the taste point seriously before committing. See our best water filter pitchers roundup for alternatives.
How to Test Your Dallas Tap Water
A citywide water quality report is an average across the distribution system. It tells you what the utility measured at its monitoring points; it does not tell you what comes out of your specific faucet, through your specific pipes. For the contaminants that depend on your building — lead above all, and disinfection byproduct concentration, which varies with distance from the plant — the only way to know your exposure is to test at home. This is especially true for lead in Dallas, where current public testing data is sparse.
A home test kit such as the Safe Home 12-in-1 kit gives a quick screen for lead and common parameters. For results you can act on, a certified-lab mail-in test is more reliable, because it quantifies contaminants at concentrations a strip cannot resolve. Tap Score is the independent lab service we reference most often; its reports break down disinfection byproducts, metals, and nitrate at meaningful detection limits. Our full walkthrough lives in how to test your water at home.
Frequently Asked Questions
Is Dallas tap water safe to drink?
By the federal definition, yes — Dallas’s water met all EPA health-based standards in the most recent assessment period. The more useful answer is that “safe” and “legal” are not the same thing. Dallas’s water exceeds the EWG’s stricter health guidelines for 17 contaminants, led by disinfection byproducts at dozens of times the one-in-a-million cancer-risk benchmark. It is legal water with a measurable long-term risk profile that a catalytic carbon or reverse osmosis filter can substantially reduce.
Does Dallas water have PFAS?
Yes. Dallas’s monitoring detected three PFAS compounds — PFOA at 1.60 ppt, PFOS at 0.792 ppt, and PFHxS — above EWG’s health-based guidelines, though the reported PFOA and PFOS levels stay under the EPA’s enforceable 4 ppt limits set in 2024. The levels are low compared with heavily contaminated systems, but PFAS is persistent. If PFAS is your primary concern, reverse osmosis is the most reliable removal method.
How hard is Dallas water?
Dallas has hard water at the lower end of the range, generally about 8 to 9 grains per gallon (roughly 140 to 160 ppm) — which sits in the “hard” band on both the standard GPG scale and the USGS classification. That level produces some scale on fixtures and water heaters and reduces soap lather, but it is usually not severe enough to require a whole-house softener. Most Dallas households are better off directing their filtration budget at disinfection byproducts and chromium-6 rather than at hardness.
Why does Dallas water sometimes smell like chlorine or ammonia?
Dallas uses chloramine — a blend of chlorine and ammonia — as its residual disinfectant, which can produce a faint chemical or pool-like odor. Chloramine is more stable than free chlorine and harder to remove, so a basic carbon pitcher may not fully eliminate the taste. A filter certified for chloramine reduction, which uses catalytic carbon, addresses both the odor and the associated byproducts.
Do I need a water filter in Dallas?
If you want to reduce the disinfection byproducts that dominate Dallas’s profile, a filter is worth installing. A certified catalytic carbon under-sink system addresses the byproducts, chloramine, and lead; reverse osmosis additionally handles hexavalent chromium, nitrate, and PFAS. Test your tap first — especially if your home predates 1986 — so you can match the filter to what is actually present rather than buying more system than you need.
Sources Cited
- EWG Tap Water Database — City of Dallas (PWS ID TX0570004): https://www.ewg.org/tapwater/system.php?pws=TX0570004
- EWG — “What’s in Dallas’ drinking water?” (February 2025): https://www.ewg.org/news-insights/news/2025/02/whats-dallas-drinking-water
- City of Dallas Water Utilities — Water Quality Information / Consumer Confidence Report: https://dallascityhall.com/departments/waterutilities/Pages/water_quality_information.aspx
- City of Dallas Water Utilities — FY25 Fact Sheet (source reservoirs and treatment plants): https://dallascityhall.com/departments/waterutilities/DCH%20Documents/FY25%20DWU%20FACT%20SHEET_FINAL.pdf
- U.S. EPA — PFAS National Primary Drinking Water Regulation (2024): https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas
- U.S. EPA — Safe Drinking Water Information System (SDWIS)
- NSF International — Certified Drinking Water Treatment Units database: https://info.nsf.org/Certified/DWTU/