What was found in ZIP 77433
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
Highest in the ZIP: 2248 µg/L — CYPRESS HILL MUD 1 · 11,052 people · 2017 | 4/9 | SYR4 |
| Copper | 213.99999999999977 µg/L 16% of the EPA limit 1300 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 1234.4999999999995 µg/L — HARRIS COUNTY MUD 354 · 6,588 people · 2019 | 9/9 | 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: 940 µg/L — CYPRESS HILL MUD 1 · 11,052 people · 2019 | 4/9 | 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: 768 µg/L — HARRIS COUNTY MUD 172 · 4,404 people · 2014 | 4/9 | SYR4 |
| Barium | 237.4 µg/L 12% of the EPA limit 2000 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 4/9 | SYR4 |
| Cyanide | 166 µg/L 83% of the EPA limit 200 µg/L Highest in the ZIP: HARRIS COUNTY MUD 172 · 4,404 people · 2019 | 1/9 | 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: 46.559999999999945 µg/L — HARRIS COUNTY MUD 374 CYPRESS CREEK LAKE · 5,526 people · 2019 | 9/9 | 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: 44.69999999999998 µg/L — HARRIS COUNTY MUD 374 CYPRESS CREEK LAKE · 5,526 people · 2019 | 9/9 | SYR4 |
| Lithium | 28.4 µg/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2025
Highest in the ZIP: 41.6 µg/L — CYPRESS HILL MUD 1 · 11,052 people · 2024 | 7/9 | UCMR-5 |
| Dichloroacetic Acid | 31.999999999999993 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 172 · 4,404 people · 2019 | 5/9 | SYR4 |
| Chloroform | 29.11999999999995 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 374 CYPRESS CREEK LAKE · 5,526 people · 2019 | 5/9 | 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 | 3/9 | 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: 14.799999999999994 µg/L — HARRIS COUNTY MUD 322 · 4,266 people · 2018 | 9/9 | SYR4 |
| Arsenic | 9.36 µg/L 94% of the EPA limit 10 µg/L Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 12.219999999999999 µg/L — HARRIS COUNTY MUD 157 · 13,062 people · 2018 | 4/9 | SYR4 |
| Bromodichloromethane | 1.52 µg/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 12.099999999999996 µg/L — HARRIS COUNTY MUD 374 CYPRESS CREEK LAKE · 5,526 people · 2019 | 9/9 | SYR4 |
| Trichloroacetic Acid | 10.45999999999999 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 374 CYPRESS CREEK LAKE · 5,526 people · 2019 | 4/9 | SYR4 |
| Nitrite | 10 µg/L 1% of the EPA limit 1000 µg/L Highest in the ZIP: CYPRESS HILL MUD 1 · 11,052 people · 2017 | 1/9 | 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 | 3/9 | 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
Highest in the ZIP: 8.7 µg/L — HARRIS COUNTY MUD 157 · 13,062 people · 2018 | 3/9 | SYR4 |
| Monochloroacetic Acid | 8.67 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 172 · 4,404 people · 2019 | 4/9 | SYR4 |
| Bromoform | 2.6199999999999997 µg/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 8.394999999999996 µg/L — CYPRESS HILL MUD 1 · 11,052 people · 2019 | 8/9 | SYR4 |
| Dibromochloromethane | 2.779999999999999 µg/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019
Highest in the ZIP: 8.25 µg/L — CYPRESS HILL MUD 1 · 11,052 people · 2019 | 9/9 | SYR4 |
| Gross Beta Particle Activity | 5.08 pCi/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2019 | 2/9 | 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 | 2/9 | 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 | 1/9 | 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: 3.089999999999998 µg/L — HARRIS COUNTY MUD 419 · 7,389 people · 2019 | 9/9 | 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
Highest in the ZIP: 1.8649999999999998 µg/L — CYPRESS HILL MUD 1 · 11,052 people · 2019 | 3/9 | 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
Highest in the ZIP: 1.5 pCi/L — HARRIS COUNTY MUD 172 · 4,404 people · 2015 | 2/9 | 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
Highest in the ZIP: 0.9900 µg/L — HARRIS COUNTY MUD 172 · 4,404 people · 2018 | 2/9 | SYR4 |
| Atrazine | 0.2365 µg/L 7.9% of the EPA limit 3 µg/L Highest in the ZIP: HARRIS COUNTY MUD 172 · 4,404 people · 2018 | 1/9 | SYR4 |
| Simazine | 0.1375 µg/L 3.4% of the EPA limit 4 µg/L Highest in the ZIP: HARRIS COUNTY MUD 172 · 4,404 people · 2018 | 1/9 | SYR4 |
| Pfhxa | 0.0041 µg/L No EPA limit set Main supplier: HARRIS COUNTY MUD 165 · 40,503 people · 2025
Highest in the ZIP: 0.0099 µg/L — HARRIS COUNTY MUD 157 · 13,062 people · 2023 | 4/9 | 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: 0.0082 µg/L — HARRIS COUNTY MUD 157 · 13,062 people · 2023 | 5/9 | UCMR-5 |
| Pfba | 0.0061 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 419 · 7,389 people · 2025 | 3/9 | UCMR-5 |
| PFBS | 0.0043 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 157 · 13,062 people · 2023 | 1/9 | UCMR-5 |
| PFHXS | 0.0037 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 157 · 13,062 people · 2023 | 1/9 | 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: 0.0022 mg/L — CYPRESS HILL MUD 1 · 11,052 people · 2025 | 9/9 | 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 77433
| Supplier | State | Population served |
|---|---|---|
| HARRIS COUNTY MUD 165 | TX | 40,503 |
| HARRIS COUNTY MUD 157 | TX | 13,062 |
| CYPRESS HILL MUD 1 | TX | 11,052 |
| HARRIS COUNTY MUD 419 | TX | 7,389 |
| HARRIS COUNTY MUD 354 | TX | 6,588 |
| HARRIS COUNTY MUD 374 CYPRESS CREEK LAKE | TX | 5,526 |
| HARRIS COUNTY MUD 397 | TX | 4,413 |
| HARRIS COUNTY MUD 172 | TX | 4,404 |
| HARRIS COUNTY MUD 322 | TX | 4,266 |
Frequently asked questions about ZIP 77433 tap water
Is the tap water in ZIP 77433 safe to drink?
EPA testing detected 37 contaminants across the water suppliers serving ZIP 77433. 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 77433?
9 public water suppliers report EPA drinking-water monitoring for ZIP 77433. Each is listed above with its population served.
What contaminants are in ZIP 77433's water?
EPA monitoring detected Fluoride, Copper, Nitrate, Nitrate-Nitrite, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.