What was found in ZIP 77443
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 | 1003.9999999999999 µg/L 25% of the EPA limit 4000 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 2/2 | SYR4 |
| Nitrate | 220 µg/L 2.2% of the EPA limit 10000 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 790 µg/L — HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 220 µg/L 2.2% of the EPA limit 10000 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2018
Highest in the ZIP: 766 µg/L — HARRIS COUNTY MUD 70 · 5,763 people · 2015 | 2/2 | SYR4 |
| Barium | 237.4 µg/L 12% of the EPA limit 2000 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 2/2 | SYR4 |
| Copper | 213.99999999999977 µg/L 16% of the EPA limit 1300 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 2/2 | SYR4 |
| Cyanide | 160 µg/L 80% of the EPA limit 200 µg/L Highest in the ZIP: HARRIS COUNTY MUD 70 · 5,763 people · 2017 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.2 µg/L 2% of the EPA limit 60 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 41.94 µg/L — HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 2/2 | SYR4 |
| TTHM | 7.16 µg/L 9% of the EPA limit 80 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 40.535 µg/L — HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 30.529999999999994 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 1/2 | SYR4 |
| Lithium | 28.4 µg/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2025 | 1/2 | UCMR-5 |
| Chloroform | 26.755 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 1/2 | SYR4 |
| Xylenes, Total | 15.6 µg/L 0.2% of the EPA limit 10000 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 1.52 µg/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 11.365 µg/L — HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 9.759999999999998 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 1/2 | SYR4 |
| Arsenic | 9.36 µg/L 94% of the EPA limit 10 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 9.35 µg/L 31% of the EPA limit 30 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 1/2 | SYR4 |
| Lead | 2.929999999999999 µg/L 20% of the EPA limit 15 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 8.53 µg/L — HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 6.5249999999999995 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 2.779999999999999 µg/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 6.134999999999994 µg/L — HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 5.08 pCi/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 5.3 pCi/L — HARRIS COUNTY MUD 70 · 5,763 people · 2017 | 2/2 | SYR4 |
| Selenium | 4.8 µg/L 9.6% of the EPA limit 50 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.744999999999999 pCi/L 32% of the EPA limit 15 pCi/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 2/2 | SYR4 |
| Toluene | 4.0249999999999995 µg/L 0.4% of the EPA limit 1000 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 1.2 µg/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 3.44 µg/L — HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 2/2 | SYR4 |
| Bromoform | 2.6199999999999997 µg/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 2.8699999999999997 µg/L — HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 2/2 | SYR4 |
| Ethylbenzene | 1.77 µg/L 0.3% of the EPA limit 700 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.1 pCi/L 22% of the EPA limit 5 pCi/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.6300 µg/L 11% of the EPA limit 6 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 1/2 | SYR4 |
| Atrazine | 0.3750 µg/L 13% of the EPA limit 3 µg/L Highest in the ZIP: HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 1/2 | SYR4 |
| Simazine | 0.1785 µg/L 4.5% of the EPA limit 4 µg/L Highest in the ZIP: HARRIS COUNTY MUD 70 · 5,763 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0092 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 70 · 5,763 people · 2024 | 1/2 | UCMR-5 |
| Pfpea | 0.0047 µg/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2025
Highest in the ZIP: 0.0068 µg/L — HARRIS COUNTY MUD 70 · 5,763 people · 2024 | 2/2 | UCMR-5 |
| Pfhxa | 0.0041 µg/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2025
Highest in the ZIP: 0.0063 µg/L — HARRIS COUNTY MUD 70 · 5,763 people · 2024 | 2/2 | UCMR-5 |
| PFBS | 0.0034 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 70 · 5,763 people · 2024 | 1/2 | UCMR-5 |
| PFHXS | 0.0034 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 70 · 5,763 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0013 mg/L 8.7% of the EPA limit 0.0150 mg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2025
Highest in the ZIP: 0.0019 mg/L — HARRIS COUNTY MUD 70 · 5,763 people · 2025 | 2/2 | 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 77443
| Supplier | State | Population served |
|---|---|---|
| HARRIS COUNTY MUD 165 | TX | 40,503 |
| HARRIS COUNTY MUD 70 | TX | 5,763 |
Frequently asked questions about ZIP 77443 tap water
Is the tap water in ZIP 77443 safe to drink?
EPA testing detected 36 contaminants across the water suppliers serving ZIP 77443. 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 77443?
2 public water suppliers report EPA drinking-water monitoring for ZIP 77443. Each is listed above with its population served.
What contaminants are in ZIP 77443'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.