What was found in Missouri City'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 |
|---|---|---|---|
| Fluoride | 337.5 µg/L 8.4% of the EPA limit 4000 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2017
Highest in the city: 1850 µg/L — CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2019 | 5/6 | SYR4 |
| Nitrate | 1640 µg/L 16% of the EPA limit 10000 µg/L Highest in the city: CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2019 | 3/6 | SYR4 |
| Chlorite | 869.6 µg/L 87% of the EPA limit 1000 µg/L Highest in the city: CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2019 | 1/6 | SYR4 |
| 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 city: 657.45 µg/L — CITY OF MISSOURI CITY · 4,847 people · 2018 | 6/6 | 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 city: 229.2 µg/L — CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2019 | 5/6 | SYR4 |
| Cyanide | 79 µg/L 40% of the EPA limit 200 µg/L Highest in the city: CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2019 | 1/6 | 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 city: 67.31 µg/L — CITY OF MISSOURI CITY · 4,847 people · 2019 | 4/6 | 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 | 3/6 | SYR4 |
| Chloroform | 14.25 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the city: 40.6 µg/L — CITY OF MISSOURI CITY · 4,847 people · 2019 | 3/6 | 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 city: 37.29 µg/L — CITY OF MISSOURI CITY · 4,847 people · 2019 | 4/6 | SYR4 |
| Bromodichloromethane | 3.555 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the city: 25.15 µg/L — CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2019 | 4/6 | SYR4 |
| Dichloroacetic Acid | 11.89 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the city: 21.05 µg/L — CITY OF MISSOURI CITY · 4,847 people · 2019 | 2/6 | SYR4 |
| Lithium | 15.7 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2025
Highest in the city: 21 µg/L — THUNDERBIRD UTILITY DISTRICT 1 · 4,203 people · 2024 | 3/6 | UCMR-5 |
| Dibromochloromethane | 2 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the city: 20 µg/L — CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2019 | 4/6 | 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 city: 18.175 pCi/L — THUNDERBIRD UTILITY DISTRICT 1 · 4,203 people · 2019 | 4/6 | SYR4 |
| Bromoform | 1.575 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the city: 18.15 µg/L — CITY OF MISSOURI CITY · 4,847 people · 2019 | 4/6 | SYR4 |
| Trichloroacetic Acid | 3 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the city: 12.79 µg/L — CITY OF MISSOURI CITY · 4,847 people · 2019 | 2/6 | 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 city: 12.2 µg/L — CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2017 | 6/6 | SYR4 |
| Nitrate-Nitrite | 10 µg/L 0.1% of the EPA limit 10000 µg/L Highest in the city: CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2019 | 1/6 | SYR4 |
| Dibromoacetic Acid | 2 µg/L No EPA limit set Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2019
Highest in the city: 9.25 µg/L — CITY OF MISSOURI CITY · 4,847 people · 2019 | 4/6 | SYR4 |
| Gross Beta Particle Activity | 8 pCi/L No EPA limit set Highest in the city: CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2019 | 3/6 | SYR4 |
| Monochloroacetic Acid | 6.49 µg/L No EPA limit set Highest in the city: CITY OF MISSOURI CITY · 4,847 people · 2019 | 2/6 | 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 | 1/6 | SYR4 |
| Arsenic | 5.35 µg/L 53% of the EPA limit 10 µg/L Main supplier: QUAIL VALLEY UTILITY DISTRICT · 14,409 people · 2017 | 5/6 | SYR4 |
| Selenium | 4.335 µg/L 8.7% of the EPA limit 50 µg/L Highest in the city: CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2019 | 1/6 | 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 city: 3.96 pCi/L — MEADOWCREEK MUD · 2,607 people · 2018 | 5/6 | 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 | 2/6 | SYR4 |
| Atrazine | 1.81 µg/L 60% of the EPA limit 3 µg/L Highest in the city: CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2019 | 1/6 | 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 city: 1.5 µg/L — MEADOWCREEK MUD · 2,607 people · 2018 | 2/6 | SYR4 |
| Simazine | 0.1275 µg/L 3.2% of the EPA limit 4 µg/L Highest in the city: CITY OF MISSOURI CITY MUSTANG BAYOU WATE · 9,147 people · 2019 | 1/6 | SYR4 |
| 2,4-D | 0.1000 µg/L 0.1% of the EPA limit 70 µg/L Highest in the city: THUNDERBIRD UTILITY DISTRICT SYSTEM 2 · 1,821 people · 2019 | 1/6 | SYR4 |
| Pfpea | 0.0380 µg/L No EPA limit set Highest in the city: CITY OF MISSOURI CITY · 4,847 people · 2025 | 1/6 | UCMR-5 |
| Pfba | 0.0179 µg/L No EPA limit set Highest in the city: CITY OF MISSOURI CITY · 4,847 people · 2025 | 1/6 | 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 city: 0.0018 mg/L — THUNDERBIRD UTILITY DISTRICT SYSTEM 2 · 1,821 people · 2024 | 6/6 | 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 Missouri City
| Supplier | Population served |
|---|---|
| QUAIL VALLEY UTILITY DISTRICT | 14,409 |
| CITY OF MISSOURI CITY MUSTANG BAYOU WATE | 9,147 |
| CITY OF MISSOURI CITY | 4,847 |
| THUNDERBIRD UTILITY DISTRICT 1 | 4,203 |
| MEADOWCREEK MUD | 2,607 |
| THUNDERBIRD UTILITY DISTRICT SYSTEM 2 | 1,821 |
Frequently asked questions about Missouri City tap water
Is Missouri City tap water safe to drink?
EPA testing detected 34 contaminants in the water serving Missouri City. 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 Missouri City?
6 public water suppliers report drinking-water monitoring for Missouri City, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Missouri City's water?
The contaminants EPA monitoring detected in Missouri City include Fluoride, Nitrate, Chlorite, Copper, Barium. 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.