What was found in Dallas's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 1060 µg/L 11% of the EPA limit 10000 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 10220 µg/L — D BAR B MOBILE HOME RANCH · 267 people · 2019 | 3/7 | SYR4 |
| Fluoride | 816.85 µg/L 20% of the EPA limit 4000 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 2350.55 µg/L — D BAR B MOBILE HOME RANCH · 267 people · 2019 | 3/7 | SYR4 |
| Copper | 499.45 µg/L 38% of the EPA limit 1300 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2018 | 6/7 | SYR4 |
| Cyanide | 159.95 µg/L 80% of the EPA limit 200 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019 | 2/7 | SYR4 |
| TTHM | 24.81 µg/L 31% of the EPA limit 80 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 74.17 µg/L — D BAR B MOBILE HOME RANCH · 267 people · 2019 | 6/7 | SYR4 |
| Barium | 40 µg/L 2% of the EPA limit 2000 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 59 µg/L — D BAR B MOBILE HOME RANCH · 267 people · 2019 | 3/7 | SYR4 |
| Bromoform | 3.59 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 49.4 µg/L — D BAR B MOBILE HOME RANCH · 267 people · 2019 | 6/7 | SYR4 |
| Dibromochloromethane | 6.17 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 31.7 µg/L — D BAR B MOBILE HOME RANCH · 267 people · 2019 | 6/7 | SYR4 |
| Nitrite | 30.85 µg/L 3.1% of the EPA limit 1000 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2013 | 1/7 | SYR4 |
| Total Haloacetic Acids (HAA5) | 20.1 µg/L 34% of the EPA limit 60 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 23.13 µg/L — D BAR B MOBILE HOME RANCH · 267 people · 2019 | 6/7 | SYR4 |
| Lead | 3.13 µg/L 21% of the EPA limit 15 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2018
Highest in the city: 19.977 µg/L — CITY OF COCKRELL HILL · 3,855 people · 2019 | 5/7 | SYR4 |
| Bromodichloromethane | 8.669 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 17.04 µg/L — D BAR B MOBILE HOME RANCH · 267 people · 2019 | 6/7 | SYR4 |
| Dichloroacetic Acid | 15.11 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 15.845 µg/L — TOWN OF HIGHLAND PARK · 8,959 people · 2019 | 6/7 | SYR4 |
| Dibromoacetic Acid | 3.15 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 12.775 µg/L — D BAR B MOBILE HOME RANCH · 267 people · 2019 | 5/7 | SYR4 |
| Chloroform | 11.8 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019 | 6/7 | SYR4 |
| Bromate | 11.05 µg/L 111% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019 | 1/7 | SYR4 |
| Chromium | 2.876 µg/L 2.9% of the EPA limit 100 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 7.58 µg/L — D BAR B MOBILE HOME RANCH · 267 people · 2019 | 3/7 | SYR4 |
| Monochloroacetic Acid | 7.105 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 7.57 µg/L — D BAR B MOBILE HOME RANCH · 267 people · 2019 | 6/7 | SYR4 |
| Gross Beta Particle Activity | 6.39 pCi/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2017 | 2/7 | SYR4 |
| Selenium | 3.9855 µg/L 8% of the EPA limit 50 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019 | 3/7 | SYR4 |
| Monobromoacetic Acid | 3.38 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019 | 6/7 | SYR4 |
| Trichloroacetic Acid | 2.76 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019 | 6/7 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 2.59 µg/L 43% of the EPA limit 6 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019 | 1/7 | SYR4 |
| Arsenic | 1.887 µg/L 19% of the EPA limit 10 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019 | 2/7 | SYR4 |
| Combined Radium (-226 And -228) | 1 pCi/L 20% of the EPA limit 5 pCi/L Highest in the city: DALLAS COUNTY PARK CITIES MUD · 0 people · 2012 | 1/7 | SYR4 |
| Atrazine | 0.3000 µg/L 10% of the EPA limit 3 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019
Highest in the city: 0.3360 µg/L — DALLAS COUNTY PARK CITIES MUD · 0 people · 2019 | 2/7 | SYR4 |
| Simazine | 0.3280 µg/L 8.2% of the EPA limit 4 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019 | 2/7 | SYR4 |
| Antimony, Total | 0.3200 µg/L 5.3% of the EPA limit 6 µg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2019 | 2/7 | SYR4 |
| Heptachlor Epoxide | 0.0300 µg/L 15% of the EPA limit 0.2000 µg/L Highest in the city: DALLAS COUNTY PARK CITIES MUD · 0 people · 2019 | 1/7 | SYR4 |
| Pfpea | 0.0182 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2024 | 4/7 | UCMR-5 |
| Pfhxa | 0.0179 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2024 | 4/7 | UCMR-5 |
| Pfba | 0.0132 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2024
Highest in the city: 0.0138 µg/L — CITY OF UNIVERSITY PARK · 25,617 people · 2024 | 4/7 | UCMR-5 |
| PFBS | 0.0076 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2024
Highest in the city: 0.0089 µg/L — CITY OF UNIVERSITY PARK · 25,617 people · 2024 | 4/7 | UCMR-5 |
| PFOA | 0.0063 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2024 | 3/7 | UCMR-5 |
| Pfhpa | 0.0060 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2024 | 3/7 | UCMR-5 |
| PFOS | 0.0051 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2024 | 3/7 | UCMR-5 |
| PFHXS | 0.0038 µg/L No EPA limit set Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2024
Highest in the city: 0.0047 µg/L — CITY OF UNIVERSITY PARK · 25,617 people · 2024 | 4/7 | UCMR-5 |
| Lead | 0.0011 mg/L 7.3% of the EPA limit 0.0150 mg/L Main supplier: DALLAS WATER UTILITY · 1,356,479 people · 2024
Highest in the city: 0.0034 mg/L — TOWN OF HIGHLAND PARK · 8,959 people · 2025 | 6/7 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Dallas
| Supplier | Population served |
|---|---|
| DALLAS WATER UTILITY | 1,356,479 |
| CITY OF UNIVERSITY PARK | 25,617 |
| TOWN OF HIGHLAND PARK | 8,959 |
| CITY OF COCKRELL HILL | 3,855 |
| D BAR B MOBILE HOME RANCH | 267 |
| DALLAS COUNTY MUD 4 | 150 |
| DALLAS COUNTY PARK CITIES MUD | 0 |
Frequently asked questions about Dallas tap water
Is Dallas tap water safe to drink?
EPA testing detected 38 contaminants in the water serving Dallas. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Dallas?
7 public water suppliers report drinking-water monitoring for Dallas, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Dallas's water?
The contaminants EPA monitoring detected in Dallas include Nitrate, Fluoride, Copper, Cyanide, TTHM. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.