What was found in ZIP 77375
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 | 2364.5 µg/L 59% of the EPA limit 4000 µg/L Highest in the ZIP: DOWDELL PUD · 7,002 people · 2018 | 5/6 | SYR4 |
| Nitrate | 1014.9999999999999 µg/L 10% of the EPA limit 10000 µg/L Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2019 | 5/6 | SYR4 |
| Nitrate-Nitrite | 833.9999999999997 µg/L 8.3% of the EPA limit 10000 µg/L Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2017 | 5/6 | 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: 551.5999999999999 µg/L — CITY OF TOMBALL · 17,532 people · 2017 | 6/6 | SYR4 |
| Barium | 391.79999999999995 µg/L 20% of the EPA limit 2000 µg/L Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2017 | 5/6 | SYR4 |
| Cyanide | 143 µg/L 72% of the EPA limit 200 µg/L Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2017 | 1/6 | 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 | 6/6 | SYR4 |
| Lithium | 55.3 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2025
Highest in the ZIP: 60 µg/L — HARRIS COUNTY MUD 401 · 3,750 people · 2023 | 6/6 | UCMR-5 |
| Chloroform | 47.589999999999996 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019 | 4/6 | 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
Highest in the ZIP: 34.47999999999999 µg/L — HARRIS COUNTY MUD 368 · 11,835 people · 2019 | 6/6 | SYR4 |
| Dichloroacetic Acid | 6.46 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019
Highest in the ZIP: 28.819999999999986 µg/L — HARRIS COUNTY MUD 368 · 11,835 people · 2019 | 3/6 | SYR4 |
| Nitrite | 28.499999999999996 µg/L 2.8% of the EPA limit 1000 µg/L Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2017 | 2/6 | 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: 24.59999999999998 µg/L — HARRIS COUNTY MUD 368 · 11,835 people · 2017 | 6/6 | 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: 15.25999999999996 µg/L — DOWDELL PUD · 7,002 people · 2019 | 6/6 | SYR4 |
| Bromodichloromethane | 11.209999999999999 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019 | 6/6 | SYR4 |
| Dibromochloromethane | 10.794999999999996 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019 | 6/6 | SYR4 |
| Arsenic | 10.379999999999999 µg/L 104% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2017 | 3/6 | SYR4 |
| Selenium | 8.1 µg/L 16% of the EPA limit 50 µg/L Highest in the ZIP: DOWDELL PUD · 7,002 people · 2019 | 2/6 | SYR4 |
| Monochloroacetic Acid | 7.1 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2019 | 1/6 | SYR4 |
| Dibromoacetic Acid | 4.499999999999999 µg/L No EPA limit set Main supplier: HARRIS MONTGOMERY COUNTIES MUD 386 · 18,018 people · 2019 | 5/6 | SYR4 |
| Gross Beta Particle Activity | 4.2 pCi/L No EPA limit set Highest in the ZIP: CITY OF TOMBALL · 17,532 people · 2017 | 2/6 | SYR4 |
| Trichloroacetic Acid | 3.9349999999999996 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2019 | 2/6 | 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 | 4/6 | SYR4 |
| Combined Radium (-226 And -228) | 3 pCi/L 60% of the EPA limit 5 pCi/L Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2014 | 4/6 | SYR4 |
| Xylenes, Total | 2.6 µg/L 0% of the EPA limit 10000 µg/L Highest in the ZIP: CITY OF TOMBALL · 17,532 people · 2019 | 3/6 | SYR4 |
| Benzene | 0.8800 µg/L 18% of the EPA limit 5 µg/L Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2018 | 2/6 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.8600 µg/L 14% of the EPA limit 6 µg/L Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2019 | 1/6 | SYR4 |
| Atrazine | 0.8570 µg/L 29% of the EPA limit 3 µg/L Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2019 | 1/6 | SYR4 |
| Toluene | 0.8000 µg/L 0.1% of the EPA limit 1000 µg/L Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2018 | 1/6 | SYR4 |
| Ethylbenzene | 0.5000 µg/L 0.1% of the EPA limit 700 µg/L Highest in the ZIP: CITY OF TOMBALL · 17,532 people · 2019 | 1/6 | SYR4 |
| Simazine | 0.2460 µg/L 6.2% of the EPA limit 4 µg/L Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2019 | 1/6 | SYR4 |
| Pfba | 0.0063 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2025 | 1/6 | UCMR-5 |
| Pfpea | 0.0043 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2025 | 1/6 | UCMR-5 |
| Pfhxa | 0.0030 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 368 · 11,835 people · 2025 | 1/6 | UCMR-5 |
| 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 | 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.
Water suppliers serving ZIP 77375
| Supplier | State | Population served |
|---|---|---|
| HARRIS MONTGOMERY COUNTIES MUD 386 | TX | 18,018 |
| CITY OF TOMBALL | TX | 17,532 |
| HARRIS COUNTY MUD 1 | TX | 12,342 |
| HARRIS COUNTY MUD 368 | TX | 11,835 |
| DOWDELL PUD | TX | 7,002 |
| HARRIS COUNTY MUD 401 | TX | 3,750 |
Frequently asked questions about ZIP 77375 tap water
Is the tap water in ZIP 77375 safe to drink?
EPA testing detected 35 contaminants across the water suppliers serving ZIP 77375. 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 77375?
6 public water suppliers report EPA drinking-water monitoring for ZIP 77375. Each is listed above with its population served.
What contaminants are in ZIP 77375's water?
EPA monitoring detected Fluoride, Nitrate, Nitrate-Nitrite, Copper, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.