What was found in Laredo'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 | 1100 µg/L 11% of the EPA limit 10000 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2019 | 3/4 | SYR4 |
| Fluoride | 770 µg/L 19% of the EPA limit 4000 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2019 | 2/4 | SYR4 |
| Copper | 140 µg/L 11% of the EPA limit 1300 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2018
Highest in the city: 346.85 µg/L — WEBB COUNTY WATER UTILITIES · 8,358 people · 2019 | 3/4 | SYR4 |
| Cyanide | 126.5 µg/L 63% of the EPA limit 200 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2019 | 2/4 | SYR4 |
| TTHM | 89.8 µg/L 112% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2019
Highest in the city: 106.6 µg/L — WEBB COUNTY WATER UTILITIES · 8,358 people · 2019 | 3/4 | SYR4 |
| Barium | 100.23 µg/L 5% of the EPA limit 2000 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2019 | 2/4 | SYR4 |
| Nitrate-Nitrite | 90 µg/L 0.9% of the EPA limit 10000 µg/L Highest in the city: LOS BOTINES WSC · 54 people · 2013 | 1/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 44.2 µg/L 74% of the EPA limit 60 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2019
Highest in the city: 56.76 µg/L — WEBB COUNTY WATER UTILITIES · 8,358 people · 2019 | 3/4 | SYR4 |
| Lithium | 34.3 µg/L No EPA limit set Main supplier: CITY OF LAREDO · 260,046 people · 2024
Highest in the city: 40.7 µg/L — WEBB COUNTY WATER UTILITIES · 8,358 people · 2025 | 2/4 | UCMR-5 |
| Bromodichloromethane | 30.82 µg/L No EPA limit set Main supplier: CITY OF LAREDO · 260,046 people · 2019
Highest in the city: 38 µg/L — WEBB COUNTY WATER UTILITIES · 8,358 people · 2019 | 3/4 | SYR4 |
| Chloroform | 25.98 µg/L No EPA limit set Main supplier: CITY OF LAREDO · 260,046 people · 2019
Highest in the city: 36.64 µg/L — WEBB COUNTY WATER UTILITIES · 8,358 people · 2019 | 3/4 | SYR4 |
| Dibromochloromethane | 32.42 µg/L No EPA limit set Main supplier: CITY OF LAREDO · 260,046 people · 2019
Highest in the city: 32.845 µg/L — WEBB COUNTY WATER DISPENSER · 3,362 people · 2019 | 3/4 | SYR4 |
| Dichloroacetic Acid | 19.96 µg/L No EPA limit set Main supplier: CITY OF LAREDO · 260,046 people · 2019
Highest in the city: 31.42 µg/L — WEBB COUNTY WATER UTILITIES · 8,358 people · 2019 | 3/4 | SYR4 |
| Bromoform | 11.1 µg/L No EPA limit set Main supplier: CITY OF LAREDO · 260,046 people · 2019
Highest in the city: 21.555 µg/L — WEBB COUNTY WATER DISPENSER · 3,362 people · 2019 | 3/4 | SYR4 |
| Trichloroacetic Acid | 14.08 µg/L No EPA limit set Main supplier: CITY OF LAREDO · 260,046 people · 2019
Highest in the city: 17.82 µg/L — WEBB COUNTY WATER UTILITIES · 8,358 people · 2019 | 3/4 | SYR4 |
| Dibromoacetic Acid | 10.87 µg/L No EPA limit set Main supplier: CITY OF LAREDO · 260,046 people · 2019
Highest in the city: 12.75 µg/L — WEBB COUNTY WATER DISPENSER · 3,362 people · 2019 | 3/4 | SYR4 |
| Nitrite | 10 µg/L 1% of the EPA limit 1000 µg/L Highest in the city: LOS BOTINES WSC · 54 people · 2013 | 1/4 | SYR4 |
| Monochloroacetic Acid | 6.255 µg/L No EPA limit set Main supplier: CITY OF LAREDO · 260,046 people · 2019
Highest in the city: 7.75 µg/L — WEBB COUNTY WATER UTILITIES · 8,358 people · 2019 | 3/4 | SYR4 |
| Monobromoacetic Acid | 6.36 µg/L No EPA limit set Main supplier: CITY OF LAREDO · 260,046 people · 2019 | 3/4 | SYR4 |
| Gross Beta Particle Activity | 6.32 pCi/L No EPA limit set Main supplier: CITY OF LAREDO · 260,046 people · 2018 | 2/4 | SYR4 |
| Lead | 1.845 µg/L 12% of the EPA limit 15 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2018
Highest in the city: 6.14 µg/L — WEBB COUNTY WATER UTILITIES · 8,358 people · 2019 | 3/4 | SYR4 |
| Selenium | 4.06 µg/L 8.1% of the EPA limit 50 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2019 | 2/4 | SYR4 |
| Arsenic | 3.925 µg/L 39% of the EPA limit 10 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2019 | 1/4 | SYR4 |
| Combined Uranium | 3.275 µg/L 11% of the EPA limit 30 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2018 | 1/4 | SYR4 |
| Dalapon | 2.2 µg/L 1.1% of the EPA limit 200 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2019 | 2/4 | SYR4 |
| Antimony, Total | 2.1 µg/L 35% of the EPA limit 6 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2019 | 1/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2 pCi/L 13% of the EPA limit 15 pCi/L Main supplier: CITY OF LAREDO · 260,046 people · 2018 | 1/4 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.4 µg/L 23% of the EPA limit 6 µg/L Highest in the city: WEBB COUNTY WATER UTILITIES · 8,358 people · 2019 | 1/4 | SYR4 |
| Atrazine | 0.1000 µg/L 3.3% of the EPA limit 3 µg/L Main supplier: CITY OF LAREDO · 260,046 people · 2019 | 1/4 | SYR4 |
| Pfba | 0.0106 µg/L No EPA limit set Main supplier: CITY OF LAREDO · 260,046 people · 2024 | 2/4 | UCMR-5 |
| Pfpea | 0.0034 µg/L No EPA limit set Highest in the city: WEBB COUNTY WATER UTILITIES · 8,358 people · 2025 | 1/4 | UCMR-5 |
| Lead | 0.0014 mg/L 9.1% of the EPA limit 0.0150 mg/L Main supplier: CITY OF LAREDO · 260,046 people · 2024 | 3/4 | 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 Laredo
| Supplier | Population served |
|---|---|
| CITY OF LAREDO | 260,046 |
| WEBB COUNTY WATER UTILITIES | 8,358 |
| WEBB COUNTY WATER DISPENSER | 3,362 |
| LOS BOTINES WSC | 54 |
Frequently asked questions about Laredo tap water
Is Laredo tap water safe to drink?
EPA testing detected 32 contaminants in the water serving Laredo. 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 Laredo?
4 public water suppliers report drinking-water monitoring for Laredo, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Laredo's water?
The contaminants EPA monitoring detected in Laredo 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.