What was found in Weslaco'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 |
|---|---|---|---|
| Chlorite | 710 µg/L 71% of the EPA limit 1000 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 1/2 | SYR4 |
| Fluoride | 556.5 µg/L 14% of the EPA limit 4000 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 1/2 | SYR4 |
| Nitrate | 510 µg/L 5.1% of the EPA limit 10000 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 1/2 | SYR4 |
| Copper | 318.4 µg/L 24% of the EPA limit 1300 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2019
Highest in the city: 487.5 µg/L — TRAILS END MOBILE HOME PARK · 200 people · 2019 | 2/2 | SYR4 |
| Cyanide | 150 µg/L 75% of the EPA limit 200 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 1/2 | SYR4 |
| Barium | 115.1 µg/L 5.8% of the EPA limit 2000 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 1/2 | SYR4 |
| TTHM | 57.2 µg/L 72% of the EPA limit 80 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2019
Highest in the city: 58.21 µg/L — TRAILS END MOBILE HOME PARK · 200 people · 2019 | 2/2 | SYR4 |
| Lithium | 36.1 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2025 | 1/2 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 22.58 µg/L 38% of the EPA limit 60 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 2/2 | SYR4 |
| Bromoform | 21.48 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 18.06 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2019
Highest in the city: 18.44 µg/L — TRAILS END MOBILE HOME PARK · 200 people · 2019 | 2/2 | SYR4 |
| Lead | 6.3905 µg/L 43% of the EPA limit 15 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2019
Highest in the city: 16.735 µg/L — TRAILS END MOBILE HOME PARK · 200 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 15.23 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 13.2 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 2/2 | SYR4 |
| Chloroform | 9.745 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 9.3 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 6.33 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 4.32 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2019
Highest in the city: 5.815 µg/L — TRAILS END MOBILE HOME PARK · 200 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 5.2 pCi/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2017 | 1/2 | SYR4 |
| Selenium | 4.4 µg/L 8.8% of the EPA limit 50 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1.935 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2019
Highest in the city: 4.22 µg/L — TRAILS END MOBILE HOME PARK · 200 people · 2019 | 2/2 | SYR4 |
| Arsenic | 2.72 µg/L 27% of the EPA limit 10 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 1.3 µg/L 4.3% of the EPA limit 30 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2017 | 1/2 | SYR4 |
| Atrazine | 0.1000 µg/L 3.3% of the EPA limit 3 µg/L Main supplier: CITY OF WESLACO · 40,033 people · 2019 | 1/2 | SYR4 |
| Pfhxa | 0.0086 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2025 | 1/2 | UCMR-5 |
| Pfpea | 0.0084 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2025 | 1/2 | UCMR-5 |
| Pfba | 0.0076 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2025 | 1/2 | UCMR-5 |
| PFOS | 0.0059 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2025 | 1/2 | UCMR-5 |
| PFHXS | 0.0058 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2025 | 1/2 | UCMR-5 |
| Pfhpa | 0.0036 µg/L No EPA limit set Main supplier: CITY OF WESLACO · 40,033 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0015 mg/L 10% of the EPA limit 0.0150 mg/L Main supplier: CITY OF WESLACO · 40,033 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 Weslaco
| Supplier | Population served |
|---|---|
| CITY OF WESLACO | 40,033 |
| TRAILS END MOBILE HOME PARK | 200 |
Frequently asked questions about Weslaco tap water
Is Weslaco tap water safe to drink?
EPA testing detected 31 contaminants in the water serving Weslaco. 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 Weslaco?
2 public water suppliers report drinking-water monitoring for Weslaco, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Weslaco's water?
The contaminants EPA monitoring detected in Weslaco include Chlorite, Fluoride, Nitrate, Copper, 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.