What was found in ZIP 77373
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 |
|---|---|---|---|
| Fluoride | 860 µg/L 22% of the EPA limit 4000 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2018
Highest in the ZIP: 2305 µg/L — MEADOWHILL REGIONAL MUD · 13,863 people · 2017 | 11/11 | SYR4 |
| Nitrate | 320 µg/L 3.2% of the EPA limit 10000 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019
Highest in the ZIP: 887.5 µg/L — HARRIS COUNTY WCID 110 · 9,807 people · 2019 | 11/11 | SYR4 |
| Nitrate-Nitrite | 311 µg/L 3.1% of the EPA limit 10000 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019
Highest in the ZIP: 848 µg/L — HARRIS COUNTY WCID 110 · 9,807 people · 2015 | 11/11 | SYR4 |
| Barium | 276.75 µg/L 14% of the EPA limit 2000 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2018
Highest in the ZIP: 281.6 µg/L — HARRIS COUNTY WCID 92 · 4,752 people · 2019 | 11/11 | SYR4 |
| Copper | 105.65 µg/L 8.1% of the EPA limit 1300 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019
Highest in the ZIP: 255.35 µg/L — POSTWOOD MUD · 3,747 people · 2019 | 11/11 | SYR4 |
| TTHM | 8.24 µg/L 10% of the EPA limit 80 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019
Highest in the ZIP: 86.7 µg/L — HARRIS COUNTY MUD 82 · 18,990 people · 2019 | 10/11 | SYR4 |
| Cyanide | 10 µg/L 5% of the EPA limit 200 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2017
Highest in the ZIP: 59 µg/L — HARRIS COUNTY WCID 110 · 9,807 people · 2017 | 2/11 | SYR4 |
| Lithium | 19.1 µg/L No EPA limit set Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2025
Highest in the ZIP: 43.3 µg/L — MEADOWHILL REGIONAL MUD · 13,863 people · 2025 | 11/11 | UCMR-5 |
| Bromodichloromethane | 3.415 µg/L No EPA limit set Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019
Highest in the ZIP: 34.26 µg/L — HARRIS COUNTY MUD 82 · 18,990 people · 2019 | 10/11 | SYR4 |
| Total Haloacetic Acids (HAA5) | 25.1 µg/L 42% of the EPA limit 60 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019
Highest in the ZIP: 26.275 µg/L — HARRIS COUNTY WCID 110 · 9,807 people · 2019 | 7/11 | SYR4 |
| Dibromochloromethane | 3.78 µg/L No EPA limit set Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019
Highest in the ZIP: 24.925 µg/L — HARRIS COUNTY MUD 82 · 18,990 people · 2019 | 9/11 | SYR4 |
| Nitrite | 20 µg/L 2% of the EPA limit 1000 µg/L Highest in the ZIP: HARRIS COUNTY WCID 110 · 9,807 people · 2015 | 1/11 | SYR4 |
| Dichloroacetic Acid | 11.48 µg/L No EPA limit set Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019
Highest in the ZIP: 19.275 µg/L — HARRIS COUNTY WCID 110 · 9,807 people · 2019 | 4/11 | SYR4 |
| Chloroform | 3.005 µg/L No EPA limit set Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019
Highest in the ZIP: 18 µg/L — HARRIS COUNTY WCID 110 · 9,807 people · 2019 | 7/11 | SYR4 |
| Bromoform | 3.43 µg/L No EPA limit set Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019
Highest in the ZIP: 17.85 µg/L — NORTHGATE CROSSING MUD 1 · 3,906 people · 2019 | 8/11 | SYR4 |
| Lead | 5.885 µg/L 39% of the EPA limit 15 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019
Highest in the ZIP: 17.58 µg/L — HARRIS COUNTY MUD 82 · 18,990 people · 2017 | 11/11 | SYR4 |
| Dibromoacetic Acid | 13.68 µg/L No EPA limit set Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019 | 5/11 | SYR4 |
| Trichloroacetic Acid | 11.2 µg/L No EPA limit set Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019 | 2/11 | SYR4 |
| Xylenes, Total | 9.78 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019 | 3/11 | SYR4 |
| Arsenic | 3.75 µg/L 38% of the EPA limit 10 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2018
Highest in the ZIP: 5.405 µg/L — HARRIS COUNTY WCID 110 · 9,807 people · 2019 | 8/11 | SYR4 |
| Selenium | 3.29 µg/L 6.6% of the EPA limit 50 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2018
Highest in the ZIP: 5 µg/L — HARRIS COUNTY MUD 82 · 18,990 people · 2019 | 5/11 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4 pCi/L 27% of the EPA limit 15 pCi/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2017
Highest in the ZIP: 4.8 pCi/L — HARRIS COUNTY MUD 82 · 18,990 people · 2019 | 6/11 | SYR4 |
| Gross Beta Particle Activity | 4.5 pCi/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 82 · 18,990 people · 2019 | 2/11 | SYR4 |
| Monochloroacetic Acid | 4.03 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY WCID 110 · 9,807 people · 2019 | 1/11 | SYR4 |
| Combined Radium (-226 And -228) | 2.792 pCi/L 56% of the EPA limit 5 pCi/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2017 | 10/11 | SYR4 |
| Ethylbenzene | 1.735 µg/L 0.2% of the EPA limit 700 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019 | 2/11 | SYR4 |
| Atrazine | 1.66 µg/L 55% of the EPA limit 3 µg/L Highest in the ZIP: HARRIS COUNTY WCID 110 · 9,807 people · 2019 | 1/11 | SYR4 |
| Monobromoacetic Acid | 1.495 µg/L No EPA limit set Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019 | 1/11 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.277 µg/L 21% of the EPA limit 6 µg/L Highest in the ZIP: HARRIS COUNTY MUD 82 · 18,990 people · 2019 | 2/11 | SYR4 |
| Toluene | 0.7000 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2019 | 1/11 | SYR4 |
| Simazine | 0.1450 µg/L 3.6% of the EPA limit 4 µg/L Highest in the ZIP: HARRIS COUNTY WCID 110 · 9,807 people · 2019 | 1/11 | SYR4 |
| Pfba | 0.0080 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY WCID 110 · 9,807 people · 2024 | 1/11 | UCMR-5 |
| Lead | 0.0021 mg/L 14% of the EPA limit 0.0150 mg/L Main supplier: TIMBER LANE UTILITY DISTRICT · 24,507 people · 2025
Highest in the ZIP: 0.0032 mg/L — HARRIS COUNTY MUD 82 · 18,990 people · 2024 | 11/11 | 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 77373
| Supplier | State | Population served |
|---|---|---|
| TIMBER LANE UTILITY DISTRICT | TX | 24,507 |
| HARRIS COUNTY MUD 82 | TX | 18,990 |
| MEADOWHILL REGIONAL MUD | TX | 13,863 |
| HARRIS COUNTY WCID 110 | TX | 9,807 |
| MONTGOMERY COUNTY MUD 119 SPRING TRAILS | TX | 6,621 |
| HARRIS COUNTY MUD 43 | TX | 5,940 |
| TATTOR ROAD MUD | TX | 5,400 |
| HARRIS COUNTY WCID 92 | TX | 4,752 |
| NORTHGATE CROSSING MUD 1 | TX | 3,906 |
| NORTHGATE CROSSING MUD 2 | TX | 3,753 |
| POSTWOOD MUD | TX | 3,747 |
Frequently asked questions about ZIP 77373 tap water
Is the tap water in ZIP 77373 safe to drink?
EPA testing detected 33 contaminants across the water suppliers serving ZIP 77373. 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 77373?
11 public water suppliers report EPA drinking-water monitoring for ZIP 77373. Each is listed above with its population served.
What contaminants are in ZIP 77373's water?
EPA monitoring detected Fluoride, Nitrate, Nitrate-Nitrite, Barium, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.