What was found in Southlake'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 |
|---|---|---|---|
| Copper | 951 µg/L 73% of the EPA limit 1300 µg/L Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 2/2 | SYR4 |
| Fluoride | 860.6 µg/L 22% of the EPA limit 4000 µg/L Highest in the city: SOUTH LAKE PARK SERVICE · 108 people · 2019 | 1/2 | SYR4 |
| Nitrate | 97.5 µg/L 1% of the EPA limit 10000 µg/L Highest in the city: SOUTH LAKE PARK SERVICE · 108 people · 2019 | 1/2 | SYR4 |
| Nitrate-Nitrite | 53.025 µg/L 0.5% of the EPA limit 10000 µg/L Highest in the city: SOUTH LAKE PARK SERVICE · 108 people · 2015 | 1/2 | SYR4 |
| Cyanide | 34.1 µg/L 17% of the EPA limit 200 µg/L Highest in the city: SOUTH LAKE PARK SERVICE · 108 people · 2017 | 1/2 | SYR4 |
| Nitrite | 25 µg/L 2.5% of the EPA limit 1000 µg/L Highest in the city: SOUTH LAKE PARK SERVICE · 108 people · 2015 | 1/2 | SYR4 |
| TTHM | 17.28 µg/L 22% of the EPA limit 80 µg/L Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 14.38 µg/L 24% of the EPA limit 60 µg/L Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 11.59 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 1/2 | SYR4 |
| Lead | 9.495 µg/L 63% of the EPA limit 15 µg/L Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 2/2 | SYR4 |
| Chloroform | 8.2685 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 5.7995 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 4.66 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 1/2 | SYR4 |
| Chromium | 3.98 µg/L 4% of the EPA limit 100 µg/L Highest in the city: SOUTH LAKE PARK SERVICE · 108 people · 2019 | 1/2 | SYR4 |
| Barium | 3.8 µg/L 0.2% of the EPA limit 2000 µg/L Highest in the city: SOUTH LAKE PARK SERVICE · 108 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 3.675 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 3.075 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3 pCi/L 20% of the EPA limit 15 pCi/L Highest in the city: SOUTH LAKE PARK SERVICE · 108 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 2.6 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 1/2 | SYR4 |
| Selenium | 2.45 µg/L 4.9% of the EPA limit 50 µg/L Highest in the city: SOUTH LAKE PARK SERVICE · 108 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 2.14 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 1/2 | SYR4 |
| Bromoform | 2.075 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2019 | 2/2 | SYR4 |
| Arsenic | 1.03 µg/L 10% of the EPA limit 10 µg/L Highest in the city: SOUTH LAKE PARK SERVICE · 108 people · 2019 | 1/2 | SYR4 |
| PFHXS | 0.0107 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2024 | 1/2 | UCMR-5 |
| Pfba | 0.0088 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2024 | 1/2 | UCMR-5 |
| Pfhxa | 0.0057 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2024 | 1/2 | UCMR-5 |
| Pfpea | 0.0053 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2024 | 1/2 | UCMR-5 |
| PFOS | 0.0041 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2024 | 1/2 | UCMR-5 |
| PFBS | 0.0037 µg/L No EPA limit set Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0021 mg/L 14% of the EPA limit 0.0150 mg/L Main supplier: CITY OF SOUTHLAKE · 31,576 people · 2025 | 2/2 | 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 Southlake
| Supplier | Population served |
|---|---|
| CITY OF SOUTHLAKE | 31,576 |
| SOUTH LAKE PARK SERVICE | 108 |
Frequently asked questions about Southlake tap water
Is Southlake tap water safe to drink?
EPA testing detected 30 contaminants in the water serving Southlake. 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 Southlake?
2 public water suppliers report drinking-water monitoring for Southlake, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Southlake's water?
The contaminants EPA monitoring detected in Southlake include Copper, Fluoride, Nitrate, Nitrate-Nitrite, Cyanide. 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.