What was found in ZIP 77459
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 |
|---|---|---|---|
| Copper | 408.25 µg/L 31% of the EPA limit 1300 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the ZIP: 657.45 µg/L — CITY OF MISSOURI CITY · 4,847 people · 2018 | 9/9 | SYR4 |
| Fluoride | 337.5 µg/L 8.4% of the EPA limit 4000 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2017 | 5/9 | SYR4 |
| Barium | 197.25 µg/L 9.9% of the EPA limit 2000 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2017
Highest in the ZIP: 207.4 µg/L — THUNDERBIRD UTILITY DISTRICT 1 · 4,203 people · 2017 | 5/9 | SYR4 |
| TTHM | 16.34 µg/L 20% of the EPA limit 80 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the ZIP: 71.58 µg/L — SIENNA MUD 10 · 7,824 people · 2019 | 6/9 | SYR4 |
| Xylenes, Total | 62.1 µg/L 0.6% of the EPA limit 10000 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019 | 2/9 | SYR4 |
| Chloroform | 14.25 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the ZIP: 48.3 µg/L — SIENNA MUD 10 · 7,824 people · 2019 | 4/9 | SYR4 |
| Total Haloacetic Acids (HAA5) | 16.39 µg/L 27% of the EPA limit 60 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the ZIP: 37.29 µg/L — CITY OF MISSOURI CITY · 4,847 people · 2019 | 5/9 | SYR4 |
| Lead | 10.75 µg/L 72% of the EPA limit 15 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the ZIP: 36.12 µg/L — FORT BEND COUNTY MUD 42 WAT PLAT · 4,395 people · 2019 | 9/9 | SYR4 |
| Lithium | 15.7 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2025
Highest in the ZIP: 25 µg/L — SIENNA MUD 3 · 7,365 people · 2023 | 9/9 | UCMR-5 |
| Dichloroacetic Acid | 11.89 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the ZIP: 21.81 µg/L — SIENNA MUD 3 · 7,365 people · 2019 | 4/9 | SYR4 |
| Bromoform | 1.575 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the ZIP: 21.45 µg/L — SIENNA MUD 3 · 7,365 people · 2019 | 6/9 | SYR4 |
| Dibromochloromethane | 2 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the ZIP: 21.22 µg/L — SIENNA MUD 3 · 7,365 people · 2019 | 6/9 | SYR4 |
| Bromodichloromethane | 3.555 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the ZIP: 20.35 µg/L — CITY OF MISSOURI CITY · 4,847 people · 2019 | 5/9 | SYR4 |
| Nitrate | 20 µg/L 0.2% of the EPA limit 10000 µg/L Highest in the ZIP: THUNDERBIRD UTILITY DISTRICT 1 · 4,203 people · 2019 | 1/9 | SYR4 |
| Gross Alpha, Excl. Radon And U | 9.7 pCi/L 65% of the EPA limit 15 pCi/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2017
Highest in the ZIP: 18.175 pCi/L — THUNDERBIRD UTILITY DISTRICT 1 · 4,203 people · 2019 | 5/9 | SYR4 |
| Trichloroacetic Acid | 3 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the ZIP: 13.23 µg/L — SIENNA MUD 3 · 7,365 people · 2019 | 4/9 | SYR4 |
| Dibromoacetic Acid | 2 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the ZIP: 10.84 µg/L — SIENNA MUD 3 · 7,365 people · 2019 | 4/9 | SYR4 |
| Gross Beta Particle Activity | 7.64 pCi/L No EPA limit set Highest in the ZIP: THUNDERBIRD UTILITY DISTRICT 1 · 4,203 people · 2019 | 4/9 | SYR4 |
| Monochloroacetic Acid | 6.7 µg/L No EPA limit set Highest in the ZIP: SIENNA MUD 3 · 7,365 people · 2019 | 4/9 | SYR4 |
| Ethylbenzene | 6.23 µg/L 0.9% of the EPA limit 700 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019 | 1/9 | SYR4 |
| Arsenic | 5.35 µg/L 53% of the EPA limit 10 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2017
Highest in the ZIP: 5.43 µg/L — FIRST COLONY MUD 9 · 7,818 people · 2019 | 5/9 | SYR4 |
| Combined Uranium | 1.38 µg/L 4.6% of the EPA limit 30 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2017
Highest in the ZIP: 4.39 µg/L — FORT BEND COUNTY MUD 26 QUAIL GREEN WEST · 5,424 people · 2018 | 4/9 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 3.9 µg/L 65% of the EPA limit 6 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019 | 1/9 | SYR4 |
| Combined Radium (-226 And -228) | 2.533 pCi/L 51% of the EPA limit 5 pCi/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2017
Highest in the ZIP: 3.606 pCi/L — THUNDERBIRD UTILITY DISTRICT 1 · 4,203 people · 2019 | 5/9 | SYR4 |
| Pfpea | 0.1940 µg/L No EPA limit set Highest in the ZIP: SIENNA MUD 10 · 7,824 people · 2023 | 3/9 | UCMR-5 |
| Pfba | 0.0230 µg/L No EPA limit set Highest in the ZIP: SIENNA MUD 3 · 7,365 people · 2023 | 3/9 | UCMR-5 |
| Pfhxa | 0.0057 µg/L No EPA limit set Highest in the ZIP: SIENNA MUD 10 · 7,824 people · 2023 | 2/9 | UCMR-5 |
| PFBS | 0.0037 µg/L No EPA limit set Highest in the ZIP: SIENNA MUD 10 · 7,824 people · 2023 | 2/9 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2025
Highest in the ZIP: 0.0012 mg/L — FORT BEND COUNTY MUD 48 · 3,969 people · 2023 | 9/9 | 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 77459
| Supplier | State | Population served |
|---|---|---|
| QUAIL VALLEY UTILITY DISTRICT | TX | 14,409 |
| SIENNA MUD 10 | TX | 7,824 |
| FIRST COLONY MUD 9 | TX | 7,818 |
| SIENNA MUD 3 | TX | 7,365 |
| FORT BEND COUNTY MUD 26 QUAIL GREEN WEST | TX | 5,424 |
| CITY OF MISSOURI CITY | TX | 4,847 |
| FORT BEND COUNTY MUD 42 WAT PLAT | TX | 4,395 |
| THUNDERBIRD UTILITY DISTRICT 1 | TX | 4,203 |
| FORT BEND COUNTY MUD 48 | TX | 3,969 |
Frequently asked questions about ZIP 77459 tap water
Is the tap water in ZIP 77459 safe to drink?
EPA testing detected 29 contaminants across the water suppliers serving ZIP 77459. 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 77459?
9 public water suppliers report EPA drinking-water monitoring for ZIP 77459. Each is listed above with its population served.
What contaminants are in ZIP 77459's water?
EPA monitoring detected Copper, Fluoride, Barium, TTHM, Xylenes, Total, and others across this ZIP's suppliers. The full list with levels and sources is above.