What was found in ZIP 77389
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 | 2305 µg/L 58% of the EPA limit 4000 µg/L Highest in the ZIP: MEADOWHILL REGIONAL MUD · 13,863 people · 2017 | 6/7 | SYR4 |
| Copper | 65.79999999999995 µg/L 5.1% of the EPA limit 1300 µg/L Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2017
Highest in the ZIP: 327.3999999999997 µg/L — HARRIS COUNTY IMPROVEMENT DISTRICT 18 · 5,025 people · 2017 | 7/7 | SYR4 |
| Barium | 211.25 µg/L 11% of the EPA limit 2000 µg/L Highest in the ZIP: NORTHAMPTON MUD · 12,162 people · 2019 | 6/7 | SYR4 |
| Nitrate | 170 µg/L 1.7% of the EPA limit 10000 µg/L Highest in the ZIP: ENCANTO REAL UTILITY DISTRICT · 3,717 people · 2019 | 6/7 | SYR4 |
| Nitrate-Nitrite | 160 µg/L 1.6% of the EPA limit 10000 µg/L Highest in the ZIP: ENCANTO REAL UTILITY DISTRICT · 3,717 people · 2019 | 5/7 | SYR4 |
| TTHM | 62.994999999999976 µg/L 79% of the EPA limit 80 µg/L Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019 | 7/7 | SYR4 |
| Lithium | 55.3 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2025 | 7/7 | UCMR-5 |
| Chloroform | 47.589999999999996 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019 | 5/7 | SYR4 |
| Bromoform | 11.734999999999992 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019
Highest in the ZIP: 25.67 µg/L — HARRIS COUNTY IMPROVEMENT DISTRICT 18 · 5,025 people · 2019 | 6/7 | SYR4 |
| Lead | 2.7399999999999998 µg/L 18% of the EPA limit 15 µg/L Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2017
Highest in the ZIP: 18.865000000000013 µg/L — NORTHAMPTON MUD · 12,162 people · 2019 | 7/7 | SYR4 |
| Chromium | 15.4 µg/L 15% of the EPA limit 100 µg/L Highest in the ZIP: OAKMONT PUD · 3,450 people · 2019 | 1/7 | SYR4 |
| Dibromochloromethane | 10.794999999999996 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019
Highest in the ZIP: 13.719999999999999 µg/L — HARRIS COUNTY IMPROVEMENT DISTRICT 18 · 5,025 people · 2019 | 7/7 | SYR4 |
| Bromodichloromethane | 11.209999999999999 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019 | 6/7 | SYR4 |
| Selenium | 11 µg/L 22% of the EPA limit 50 µg/L Highest in the ZIP: OAKMONT PUD · 3,450 people · 2019 | 5/7 | SYR4 |
| Nitrite | 10 µg/L 1% of the EPA limit 1000 µg/L Highest in the ZIP: HARRIS COUNTY MUD 1 · 12,342 people · 2015 | 1/7 | SYR4 |
| Total Haloacetic Acids (HAA5) | 9.059999999999999 µg/L 15% of the EPA limit 60 µg/L Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019 | 6/7 | SYR4 |
| Dichloroacetic Acid | 6.46 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019 | 2/7 | SYR4 |
| Dibromoacetic Acid | 4.499999999999999 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019 | 6/7 | SYR4 |
| Gross Beta Particle Activity | 4.1 pCi/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 1 · 12,342 people · 2019 | 1/7 | SYR4 |
| Arsenic | 3.9 µg/L 39% of the EPA limit 10 µg/L Highest in the ZIP: OAKMONT PUD · 3,450 people · 2019 | 6/7 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.815 pCi/L 25% of the EPA limit 15 pCi/L Highest in the ZIP: HARRIS COUNTY MUD 1 · 12,342 people · 2019 | 2/7 | SYR4 |
| Combined Radium (-226 And -228) | 2.598 pCi/L 52% of the EPA limit 5 pCi/L Highest in the ZIP: ENCANTO REAL UTILITY DISTRICT · 3,717 people · 2019 | 4/7 | SYR4 |
| Trichloroacetic Acid | 1.0950000000000002 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY IMPROVEMENT DISTRICT 18 · 5,025 people · 2019 | 1/7 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.8900 µg/L 15% of the EPA limit 6 µg/L Highest in the ZIP: MEADOWHILL REGIONAL MUD · 13,863 people · 2019 | 1/7 | SYR4 |
| Xylenes, Total | 0.6000 µg/L 0% of the EPA limit 10000 µg/L Highest in the ZIP: NORTHAMPTON MUD · 12,162 people · 2019 | 2/7 | SYR4 |
| Lead | 0.0014 mg/L 9.3% of the EPA limit 0.0150 mg/L Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2023
Highest in the ZIP: 0.0029 mg/L — HARRIS COUNTY MUD 1 · 12,342 people · 2024 | 7/7 | 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 77389
| Supplier | State | Population served |
|---|---|---|
| HARRIS MONTGOMERY COUNTIES MUD 386 | TX | 18,018 |
| MEADOWHILL REGIONAL MUD | TX | 13,863 |
| HARRIS COUNTY MUD 1 | TX | 12,342 |
| NORTHAMPTON MUD | TX | 12,162 |
| HARRIS COUNTY IMPROVEMENT DISTRICT 18 | TX | 5,025 |
| ENCANTO REAL UTILITY DISTRICT | TX | 3,717 |
| OAKMONT PUD | TX | 3,450 |
Frequently asked questions about ZIP 77389 tap water
Is the tap water in ZIP 77389 safe to drink?
EPA testing detected 26 contaminants across the water suppliers serving ZIP 77389. 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 77389?
7 public water suppliers report EPA drinking-water monitoring for ZIP 77389. Each is listed above with its population served.
What contaminants are in ZIP 77389'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.