What was found in Port Isabel'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 | 1220 µg/L 12% of the EPA limit 10000 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2015 | 1/1 | SYR4 |
| Chlorite | 820.4 µg/L 82% of the EPA limit 1000 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Fluoride | 595 µg/L 15% of the EPA limit 4000 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Nitrate | 557 µg/L 5.6% of the EPA limit 10000 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Copper | 155.45 µg/L 12% of the EPA limit 1300 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2017 | 1/1 | SYR4 |
| TTHM | 149 µg/L 186% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Cyanide | 126.5 µg/L 63% of the EPA limit 200 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Barium | 126 µg/L 6.3% of the EPA limit 2000 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 57.02 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 49.835 µg/L 83% of the EPA limit 60 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Lithium | 43.7 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2023 | 1/1 | UCMR-5 |
| Bromodichloromethane | 38.87 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Chloroform | 30.05 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Bromoform | 29.065 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 22.98 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 17.215 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 16.28 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 6.57 pCi/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2017 | 1/1 | SYR4 |
| Monochloroacetic Acid | 6.275 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Lead | 5.7345 µg/L 38% of the EPA limit 15 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2017 | 1/1 | SYR4 |
| Monobromoacetic Acid | 5.505 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Selenium | 5.16 µg/L 10% of the EPA limit 50 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Arsenic | 3.3 µg/L 33% of the EPA limit 10 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 1 pCi/L 20% of the EPA limit 5 pCi/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2014 | 1/1 | SYR4 |
| Pfba | 0.0143 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2024 | 1/1 | UCMR-5 |
| Pfpea | 0.0042 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2024 | 1/1 | UCMR-5 |
| Pfhxa | 0.0037 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2024 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2023 | 1/1 | 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 Port Isabel
| Supplier | Population served |
|---|---|
| LAGUNA MADRE WATER DISTRICT | 46,674 |
Frequently asked questions about Port Isabel tap water
Is Port Isabel tap water safe to drink?
EPA testing detected 28 contaminants in the water serving Port Isabel. 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 Port Isabel?
1 public water supplier report drinking-water monitoring for Port Isabel, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Port Isabel's water?
The contaminants EPA monitoring detected in Port Isabel include Nitrate-Nitrite, Chlorite, Fluoride, Nitrate, Copper. 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.