What was found in ZIP 78578
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the 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 | 2/2 | SYR4 |
| Chlorite | 820.4 µg/L 82% of the EPA limit 1000 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019
Highest in the ZIP: 864.8 µg/L — EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Fluoride | 595 µg/L 15% of the EPA limit 4000 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 2/2 | SYR4 |
| Nitrate | 557 µg/L 5.6% of the EPA limit 10000 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 2/2 | SYR4 |
| Barium | 126 µg/L 6.3% of the EPA limit 2000 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019
Highest in the ZIP: 165.85 µg/L — EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Cyanide | 126.5 µg/L 63% of the EPA limit 200 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019
Highest in the ZIP: 162.5 µg/L — EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Copper | 155.45 µg/L 12% of the EPA limit 1300 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2017 | 2/2 | 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 | 2/2 | SYR4 |
| Nitrite | 82 µg/L 8.2% of the EPA limit 1000 µg/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 57.02 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 2/2 | SYR4 |
| Lithium | 43.7 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2023
Highest in the ZIP: 56.5 µg/L — EAST RIO HONDO WSC · 24,756 people · 2025 | 2/2 | UCMR-5 |
| 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 | 2/2 | SYR4 |
| Bromodichloromethane | 38.87 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 2/2 | SYR4 |
| Chloroform | 30.05 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 2/2 | SYR4 |
| Bromoform | 29.065 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 22.98 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 17.215 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 16.28 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 5.505 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019
Highest in the ZIP: 8.66 µg/L — EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 6.57 pCi/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2017
Highest in the ZIP: 8.605 pCi/L — EAST RIO HONDO WSC · 24,756 people · 2018 | 2/2 | SYR4 |
| Monochloroacetic Acid | 6.275 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019
Highest in the ZIP: 6.34 µg/L — EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Lead | 5.7345 µg/L 38% of the EPA limit 15 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2017 | 2/2 | SYR4 |
| Selenium | 5.16 µg/L 10% of the EPA limit 50 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 2/2 | SYR4 |
| Arsenic | 3.3 µg/L 33% of the EPA limit 10 µg/L Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2019 | 2/2 | 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
Highest in the ZIP: 1.5 pCi/L — EAST RIO HONDO WSC · 24,756 people · 2015 | 2/2 | SYR4 |
| Chromium | 1.418 µg/L 1.4% of the EPA limit 100 µg/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.4 µg/L 23% of the EPA limit 6 µg/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/2 | SYR4 |
| Antimony, Total | 0.5323 µg/L 8.9% of the EPA limit 6 µg/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/2 | SYR4 |
| Thallium, Total | 0.3741 µg/L 19% of the EPA limit 2 µg/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/2 | SYR4 |
| Atrazine | 0.1800 µg/L 6% of the EPA limit 3 µg/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0143 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2024
Highest in the ZIP: 0.0148 µg/L — EAST RIO HONDO WSC · 24,756 people · 2025 | 2/2 | UCMR-5 |
| Pfpea | 0.0042 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2024
Highest in the ZIP: 0.0117 µg/L — EAST RIO HONDO WSC · 24,756 people · 2025 | 2/2 | UCMR-5 |
| Pfhxa | 0.0037 µg/L No EPA limit set Main supplier: LAGUNA MADRE WATER DISTRICT · 46,674 people · 2024
Highest in the ZIP: 0.0112 µg/L — EAST RIO HONDO WSC · 24,756 people · 2025 | 2/2 | UCMR-5 |
| PFOS | 0.0056 µg/L No EPA limit set Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/2 | UCMR-5 |
| PFOA | 0.0054 µg/L No EPA limit set Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/2 | UCMR-5 |
| PFHXS | 0.0045 µg/L No EPA limit set Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/2 | UCMR-5 |
| Pfhpa | 0.0040 µg/L No EPA limit set Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/2 | UCMR-5 |
| PFBS | 0.0035 µg/L No EPA limit set Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/2 | 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 | 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.
Water suppliers serving ZIP 78578
| Supplier | State | Population served |
|---|---|---|
| LAGUNA MADRE WATER DISTRICT | TX | 46,674 |
| EAST RIO HONDO WSC | TX | 24,756 |
Frequently asked questions about ZIP 78578 tap water
Is the tap water in ZIP 78578 safe to drink?
EPA testing detected 39 contaminants across the water suppliers serving ZIP 78578. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 78578?
2 public water suppliers report EPA drinking-water monitoring for ZIP 78578. Each is listed above with its population served.
What contaminants are in ZIP 78578's water?
EPA monitoring detected Nitrate-Nitrite, Chlorite, Fluoride, Nitrate, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.