What was found in ZIP 78586
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 |
|---|---|---|---|
| Chlorite | 864.8 µg/L 86% of the EPA limit 1000 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Fluoride | 515 µg/L 13% of the EPA limit 4000 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Nitrate | 358.5 µg/L 3.6% of the EPA limit 10000 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 490 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 321 µg/L 3.2% of the EPA limit 10000 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/2 | SYR4 |
| Barium | 165.85 µg/L 8.3% of the EPA limit 2000 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Cyanide | 162.5 µg/L 81% of the EPA limit 200 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Copper | 89.65 µg/L 6.9% of the EPA limit 1300 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 142.5 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| TTHM | 55.125 µg/L 69% of the EPA limit 80 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 91.3 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| Nitrite | 82 µg/L 8.2% of the EPA limit 1000 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/2 | SYR4 |
| Lithium | 56.5 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 2/2 | UCMR-5 |
| Bromoform | 20.04 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 42.35 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 29.375 µg/L 49% of the EPA limit 60 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 32.04 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 18.66 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 31.19 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 13.49 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 17.12 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 14.04 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 16.79 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 12.12 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 6.34 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 9.315 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 8.66 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 8.605 pCi/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2018 | 2/2 | SYR4 |
| Chloroform | 6.41 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 8.4 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| Lead | 5.3115 µg/L 35% of the EPA limit 15 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Selenium | 4.69 µg/L 9.4% of the EPA limit 50 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 4.95 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 3.7 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 3.79 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| Arsenic | 2.89 µg/L 29% of the EPA limit 10 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2015
Highest in the ZIP: 2.3 pCi/L — CITY OF SAN BENITO · 24,250 people · 2012 | 2/2 | SYR4 |
| Di(2-ethylhexyl) Adipate | 1.78 µg/L 0.4% of the EPA limit 400 µg/L Highest in the ZIP: CITY OF SAN BENITO · 24,250 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.4 µg/L 23% of the EPA limit 6 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the ZIP: 1.653 µg/L — CITY OF SAN BENITO · 24,250 people · 2019 | 2/2 | SYR4 |
| Chromium | 1.418 µg/L 1.4% of the EPA limit 100 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/2 | SYR4 |
| Dichloromethane | 1.2 µg/L 24% of the EPA limit 5 µg/L Highest in the ZIP: CITY OF SAN BENITO · 24,250 people · 2019 | 1/2 | SYR4 |
| Antimony, Total | 0.5323 µg/L 8.9% of the EPA limit 6 µg/L Main supplier: 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 Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/2 | SYR4 |
| Atrazine | 0.1800 µg/L 6% of the EPA limit 3 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/2 | SYR4 |
| Pfba | 0.0148 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 2/2 | UCMR-5 |
| Pfpea | 0.0117 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 2/2 | UCMR-5 |
| Pfhxa | 0.0112 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 2/2 | UCMR-5 |
| PFOS | 0.0056 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 2/2 | UCMR-5 |
| PFOA | 0.0054 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/2 | UCMR-5 |
| PFHXS | 0.0045 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025
Highest in the ZIP: 0.0049 µg/L — CITY OF SAN BENITO · 24,250 people · 2025 | 2/2 | UCMR-5 |
| Pfhpa | 0.0040 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 2/2 | UCMR-5 |
| PFBS | 0.0035 µg/L No EPA limit set Main supplier: 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: EAST RIO HONDO WSC · 24,756 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.
Water suppliers serving ZIP 78586
| Supplier | State | Population served |
|---|---|---|
| EAST RIO HONDO WSC | TX | 24,756 |
| CITY OF SAN BENITO | TX | 24,250 |
Frequently asked questions about ZIP 78586 tap water
Is the tap water in ZIP 78586 safe to drink?
EPA testing detected 41 contaminants across the water suppliers serving ZIP 78586. 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 78586?
2 public water suppliers report EPA drinking-water monitoring for ZIP 78586. Each is listed above with its population served.
What contaminants are in ZIP 78586's water?
EPA monitoring detected Chlorite, Fluoride, Nitrate, Nitrate-Nitrite, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.