What was found in ZIP 77539
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 | 2502 µg/L 25% of the EPA limit 10000 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2018 | 1/2 | SYR4 |
| Nitrate | 2260 µg/L 23% of the EPA limit 10000 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 1/2 | SYR4 |
| Fluoride | 686 µg/L 17% of the EPA limit 4000 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 1/2 | SYR4 |
| Copper | 677.05 µg/L 52% of the EPA limit 1300 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 2/2 | SYR4 |
| Nitrite | 479.5 µg/L 48% of the EPA limit 1000 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 1/2 | SYR4 |
| Barium | 117.8 µg/L 5.9% of the EPA limit 2000 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 1/2 | SYR4 |
| Cyanide | 80 µg/L 40% of the EPA limit 200 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2017 | 1/2 | SYR4 |
| TTHM | 69.295 µg/L 87% of the EPA limit 80 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019
Highest in the ZIP: 73.9 µg/L — SAN LEON MUD · 11,622 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 27.85 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019
Highest in the ZIP: 32.03 µg/L — SAN LEON MUD · 11,622 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 27.84 µg/L 46% of the EPA limit 60 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019
Highest in the ZIP: 29.3 µg/L — SAN LEON MUD · 11,622 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 21.775 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019
Highest in the ZIP: 23.25 µg/L — SAN LEON MUD · 11,622 people · 2019 | 2/2 | SYR4 |
| Bromoform | 19.195 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 2/2 | SYR4 |
| Chloroform | 19.125 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 2/2 | SYR4 |
| Lithium | 17.4 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2023
Highest in the ZIP: 17.5 µg/L — SAN LEON MUD · 11,622 people · 2025 | 2/2 | UCMR-5 |
| Dichloroacetic Acid | 16.09 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 2/2 | SYR4 |
| Lead | 9.04 µg/L 60% of the EPA limit 15 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019
Highest in the ZIP: 15.025 µg/L — SAN LEON MUD · 11,622 people · 2018 | 2/2 | SYR4 |
| Dibromoacetic Acid | 9.7 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019
Highest in the ZIP: 10.97 µg/L — SAN LEON MUD · 11,622 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 7.67 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 5.355 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019
Highest in the ZIP: 6.6 µg/L — SAN LEON MUD · 11,622 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 5.865 pCi/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2016 | 1/2 | SYR4 |
| Arsenic | 3.9 µg/L 39% of the EPA limit 10 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 1/2 | SYR4 |
| Selenium | 3.59 µg/L 7.2% of the EPA limit 50 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1.84 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 2/2 | SYR4 |
| Dalapon | 1.8 µg/L 0.9% of the EPA limit 200 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.9100 µg/L 15% of the EPA limit 6 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 1/2 | SYR4 |
| Dichloromethane | 0.6850 µg/L 14% of the EPA limit 5 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 1/2 | SYR4 |
| Atrazine | 0.1630 µg/L 5.4% of the EPA limit 3 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 1/2 | SYR4 |
| Simazine | 0.1590 µg/L 4% of the EPA limit 4 µg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2019 | 1/2 | SYR4 |
| Pfpea | 0.1570 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2023 | 2/2 | UCMR-5 |
| Pfba | 0.0121 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2023
Highest in the ZIP: 0.0308 µg/L — SAN LEON MUD · 11,622 people · 2025 | 2/2 | UCMR-5 |
| Pfhxa | 0.0054 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2023 | 2/2 | UCMR-5 |
| PFBS | 0.0038 µg/L No EPA limit set Main supplier: GALVESTON COUNTY WCID 1 · 30,399 people · 2023 | 2/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: GALVESTON COUNTY WCID 1 · 30,399 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 77539
| Supplier | State | Population served |
|---|---|---|
| GALVESTON COUNTY WCID 1 | TX | 30,399 |
| SAN LEON MUD | TX | 11,622 |
Frequently asked questions about ZIP 77539 tap water
Is the tap water in ZIP 77539 safe to drink?
EPA testing detected 33 contaminants across the water suppliers serving ZIP 77539. 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 77539?
2 public water suppliers report EPA drinking-water monitoring for ZIP 77539. Each is listed above with its population served.
What contaminants are in ZIP 77539's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Copper, Nitrite, and others across this ZIP's suppliers. The full list with levels and sources is above.