What was found in ZIP 77380
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 | 1443.5 µg/L 36% of the EPA limit 4000 µg/L Highest in the ZIP: MONTGOMERY COUNTY WCID 1 · 7,070 people · 2017 | 3/8 | SYR4 |
| Copper | 126.94999999999989 µg/L 9.8% of the EPA limit 1300 µg/L Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2019
Highest in the ZIP: 278.29999999999984 µg/L — THE WOODLANDS MUD 1 · 7,989 people · 2019 | 8/8 | SYR4 |
| Barium | 211.79999999999998 µg/L 11% of the EPA limit 2000 µg/L Highest in the ZIP: SOUTHERN MONTGOMERY COUNTY MUD · 13,372 people · 2019 | 3/8 | SYR4 |
| Nitrate | 160 µg/L 1.6% of the EPA limit 10000 µg/L Highest in the ZIP: MONTGOMERY COUNTY MUD 19 · 4,422 people · 2019 | 3/8 | SYR4 |
| Nitrate-Nitrite | 157 µg/L 1.6% of the EPA limit 10000 µg/L Highest in the ZIP: MONTGOMERY COUNTY MUD 19 · 4,422 people · 2015 | 3/8 | SYR4 |
| TTHM | 74.6 µg/L 93% of the EPA limit 80 µg/L Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2019
Highest in the ZIP: 83.72499999999998 µg/L — MONTGOMERY COUNTY MUD 7 · 12,528 people · 2019 | 8/8 | SYR4 |
| Chloroform | 49.37 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2019
Highest in the ZIP: 63.254999999999995 µg/L — MONTGOMERY COUNTY MUD 7 · 12,528 people · 2019 | 8/8 | SYR4 |
| Lithium | 41.8 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2025
Highest in the ZIP: 53.6 µg/L — MONTGOMERY COUNTY MUD 19 · 4,422 people · 2024 | 8/8 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 35.035 µg/L 58% of the EPA limit 60 µg/L Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2019
Highest in the ZIP: 45.19 µg/L — THE WOODLANDS MUD 1 · 7,989 people · 2019 | 8/8 | SYR4 |
| Dichloroacetic Acid | 19 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2019
Highest in the ZIP: 24.365 µg/L — THE WOODLANDS MUD 1 · 7,989 people · 2019 | 8/8 | SYR4 |
| Bromodichloromethane | 20.489999999999995 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2019 | 8/8 | SYR4 |
| Cyanide | 20 µg/L 10% of the EPA limit 200 µg/L Highest in the ZIP: MONTGOMERY COUNTY MUD 19 · 4,422 people · 2019 | 1/8 | SYR4 |
| Trichloroacetic Acid | 12.799999999999994 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2019
Highest in the ZIP: 18.794999999999998 µg/L — THE WOODLANDS MUD 1 · 7,989 people · 2019 | 7/8 | SYR4 |
| Dibromochloromethane | 16.1 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2019 | 8/8 | SYR4 |
| Selenium | 14.165 µg/L 28% of the EPA limit 50 µg/L Highest in the ZIP: MONTGOMERY COUNTY WCID 1 · 7,070 people · 2019 | 2/8 | SYR4 |
| Lead | 10.05999999999999 µg/L 67% of the EPA limit 15 µg/L Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2019
Highest in the ZIP: 11.744999999999997 µg/L — MONTGOMERY COUNTY MUD 19 · 4,422 people · 2018 | 8/8 | SYR4 |
| Chromium | 11.3 µg/L 11% of the EPA limit 100 µg/L Highest in the ZIP: MONTGOMERY COUNTY WCID 1 · 7,070 people · 2019 | 1/8 | SYR4 |
| Bromoform | 7.219999999999999 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2019
Highest in the ZIP: 9.455 µg/L — MONTGOMERY COUNTY MUD 19 · 4,422 people · 2019 | 8/8 | SYR4 |
| Dibromoacetic Acid | 3.994999999999999 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2019
Highest in the ZIP: 6.979999999999999 µg/L — MONTGOMERY COUNTY MUD 19 · 4,422 people · 2019 | 8/8 | SYR4 |
| Arsenic | 5.15 µg/L 52% of the EPA limit 10 µg/L Highest in the ZIP: SOUTHERN MONTGOMERY COUNTY MUD · 13,372 people · 2019 | 3/8 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.5 pCi/L 30% of the EPA limit 15 pCi/L Highest in the ZIP: SOUTHERN MONTGOMERY COUNTY MUD · 13,372 people · 2019 | 1/8 | SYR4 |
| Monochloroacetic Acid | 3.35 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2019
Highest in the ZIP: 4.449999999999999 µg/L — MONTGOMERY COUNTY MUD 7 · 12,528 people · 2019 | 6/8 | SYR4 |
| Combined Radium (-226 And -228) | 2.545 pCi/L 51% of the EPA limit 5 pCi/L Highest in the ZIP: MONTGOMERY COUNTY WCID 1 · 7,070 people · 2015 | 2/8 | SYR4 |
| Xylenes, Total | 2.1999999999999997 µg/L 0% of the EPA limit 10000 µg/L Highest in the ZIP: MONTGOMERY COUNTY WCID 1 · 7,070 people · 2019 | 3/8 | SYR4 |
| Monobromoacetic Acid | 1.4 µg/L No EPA limit set Highest in the ZIP: MONTGOMERY COUNTY MUD 7 · 12,528 people · 2019 | 2/8 | SYR4 |
| Toluene | 0.7850 µg/L 0.1% of the EPA limit 1000 µg/L Highest in the ZIP: MONTGOMERY COUNTY MUD 19 · 4,422 people · 2019 | 1/8 | SYR4 |
| Carbon Tetrachloride | 0.5950 µg/L 12% of the EPA limit 5 µg/L Highest in the ZIP: MONTGOMERY COUNTY MUD 19 · 4,422 people · 2019 | 1/8 | SYR4 |
| Lead | 0.0025 mg/L 16% of the EPA limit 0.0150 mg/L Main supplier: MONTGOMERY COUNTY MUD 46 · 24,399 people · 2023
Highest in the ZIP: 0.0033 mg/L — MONTGOMERY COUNTY MUD 6 · 8,610 people · 2024 | 8/8 | 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 77380
| Supplier | State | Population served |
|---|---|---|
| MONTGOMERY COUNTY MUD 46 | TX | 24,399 |
| SOUTHERN MONTGOMERY COUNTY MUD | TX | 13,372 |
| MONTGOMERY COUNTY MUD 7 | TX | 12,528 |
| MONTGOMERY COUNTY MUD 6 | TX | 8,610 |
| THE WOODLANDS MUD 1 | TX | 7,989 |
| MONTGOMERY COUNTY WCID 1 | TX | 7,070 |
| MONTGOMERY COUNTY MUD 36 | TX | 5,235 |
| MONTGOMERY COUNTY MUD 19 | TX | 4,422 |
Frequently asked questions about ZIP 77380 tap water
Is the tap water in ZIP 77380 safe to drink?
EPA testing detected 28 contaminants across the water suppliers serving ZIP 77380. 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 77380?
8 public water suppliers report EPA drinking-water monitoring for ZIP 77380. Each is listed above with its population served.
What contaminants are in ZIP 77380's water?
EPA monitoring detected Fluoride, Copper, Barium, Nitrate, Nitrate-Nitrite, and others across this ZIP's suppliers. The full list with levels and sources is above.