What was found in Little Elm'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-Nitrite | 685.6 µg/L 6.9% of the EPA limit 10000 µg/L Highest in the city: KNOB HILL WATER SYSTEM DENTON · 234 people · 2018 | 1/2 | SYR4 |
| Nitrite | 625.2 µg/L 63% of the EPA limit 1000 µg/L Highest in the city: KNOB HILL WATER SYSTEM DENTON · 234 people · 2019 | 1/2 | SYR4 |
| Copper | 421.52 µg/L 32% of the EPA limit 1300 µg/L Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 2/2 | SYR4 |
| Fluoride | 386 µg/L 9.7% of the EPA limit 4000 µg/L Highest in the city: KNOB HILL WATER SYSTEM DENTON · 234 people · 2019 | 1/2 | SYR4 |
| Nitrate | 384.2 µg/L 3.8% of the EPA limit 10000 µg/L Highest in the city: KNOB HILL WATER SYSTEM DENTON · 234 people · 2019 | 1/2 | SYR4 |
| Cyanide | 86.3 µg/L 43% of the EPA limit 200 µg/L Highest in the city: KNOB HILL WATER SYSTEM DENTON · 234 people · 2019 | 1/2 | SYR4 |
| TTHM | 55.4 µg/L 69% of the EPA limit 80 µg/L Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 2/2 | SYR4 |
| Barium | 47.225 µg/L 2.4% of the EPA limit 2000 µg/L Highest in the city: KNOB HILL WATER SYSTEM DENTON · 234 people · 2018 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 30.7 µg/L 51% of the EPA limit 60 µg/L Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 23.6 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 19.2 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 1/2 | SYR4 |
| Chloroform | 16.9 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 15.4 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 12.57 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 1/2 | SYR4 |
| Gross Beta Particle Activity | 7.92 pCi/L No EPA limit set Highest in the city: KNOB HILL WATER SYSTEM DENTON · 234 people · 2018 | 1/2 | SYR4 |
| Bromoform | 7.3 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 6.9 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 5.9 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 5.755 pCi/L 38% of the EPA limit 15 pCi/L Highest in the city: KNOB HILL WATER SYSTEM DENTON · 234 people · 2018 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 4.29 pCi/L 86% of the EPA limit 5 pCi/L Highest in the city: KNOB HILL WATER SYSTEM DENTON · 234 people · 2018 | 1/2 | SYR4 |
| Lead | 3.992 µg/L 27% of the EPA limit 15 µg/L Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 3.83 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2019 | 2/2 | SYR4 |
| Selenium | 0.6700 µg/L 1.3% of the EPA limit 50 µg/L Highest in the city: KNOB HILL WATER SYSTEM DENTON · 234 people · 2018 | 1/2 | SYR4 |
| Antimony, Total | 0.3130 µg/L 5.2% of the EPA limit 6 µg/L Highest in the city: KNOB HILL WATER SYSTEM DENTON · 234 people · 2018 | 1/2 | SYR4 |
| Thallium, Total | 0.2750 µg/L 14% of the EPA limit 2 µg/L Highest in the city: KNOB HILL WATER SYSTEM DENTON · 234 people · 2018 | 1/2 | SYR4 |
| Pfba | 0.0075 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2025 | 1/2 | UCMR-5 |
| Pfpea | 0.0049 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2025 | 1/2 | UCMR-5 |
| Pfhxa | 0.0044 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2025 | 1/2 | UCMR-5 |
| PFBS | 0.0037 µg/L No EPA limit set Main supplier: TOWN OF LITTLE ELM · 41,000 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0022 mg/L 14% of the EPA limit 0.0150 mg/L Main supplier: TOWN OF LITTLE ELM · 41,000 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 Little Elm
| Supplier | Population served |
|---|---|
| TOWN OF LITTLE ELM | 41,000 |
| KNOB HILL WATER SYSTEM DENTON | 234 |
Frequently asked questions about Little Elm tap water
Is Little Elm tap water safe to drink?
EPA testing detected 30 contaminants in the water serving Little Elm. 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 Little Elm?
2 public water suppliers report drinking-water monitoring for Little Elm, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Little Elm's water?
The contaminants EPA monitoring detected in Little Elm include Nitrate-Nitrite, Nitrite, Copper, Fluoride, Nitrate. 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.