What was found in ZIP 77084
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 |
|---|---|---|---|
| Nitrate | 780 µg/L 7.8% of the EPA limit 10000 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 1040 µg/L — HARRIS COUNTY UD 6 · 11,262 people · 2019 | 14/14 | SYR4 |
| Nitrate-Nitrite | 310 µg/L 3.1% of the EPA limit 10000 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 1025 µg/L — HARRIS COUNTY MUD 102 · 10,401 people · 2015 | 14/14 | SYR4 |
| Copper | 338 µg/L 26% of the EPA limit 1300 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 887.5 µg/L — HARRIS COUNTY MUD 276 · 5,094 people · 2017 | 14/14 | SYR4 |
| Fluoride | 538 µg/L 13% of the EPA limit 4000 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 857 µg/L — NORTHAMPTON MUD · 12,162 people · 2017 | 14/14 | SYR4 |
| Barium | 365.4 µg/L 18% of the EPA limit 2000 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 14/14 | SYR4 |
| Cyanide | 93.5 µg/L 47% of the EPA limit 200 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 190 µg/L — JACKRABBIT ROAD PUD · 8,346 people · 2019 | 11/14 | SYR4 |
| Nitrite | 36.5 µg/L 3.7% of the EPA limit 1000 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 67.5 µg/L — JACKRABBIT ROAD PUD · 8,346 people · 2015 | 9/14 | SYR4 |
| Total Haloacetic Acids (HAA5) | 49.97 µg/L 83% of the EPA limit 60 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 13/14 | SYR4 |
| TTHM | 49.635 µg/L 62% of the EPA limit 80 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 14/14 | SYR4 |
| Chloroform | 40.95 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 14/14 | SYR4 |
| Lithium | 33.9 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2025
Highest in the ZIP: 37.7 µg/L — NORTHAMPTON MUD · 12,162 people · 2023 | 12/14 | UCMR-5 |
| Dichloroacetic Acid | 36.39 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 11/14 | SYR4 |
| Gross Alpha, Excl. Radon And U | 10.67 pCi/L 71% of the EPA limit 15 pCi/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 26.395 pCi/L — JACKRABBIT ROAD PUD · 8,346 people · 2017 | 4/14 | SYR4 |
| Lead | 10.74 µg/L 72% of the EPA limit 15 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 23.9 µg/L — WESTLAKE MUD 1 · 3,909 people · 2019 | 14/14 | SYR4 |
| Chromium | 14.11 µg/L 14% of the EPA limit 100 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 1/14 | SYR4 |
| Bromodichloromethane | 12.9 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 13.6 µg/L — LANGHAM CREEK UTILITY DISTRICT · 10,377 people · 2019 | 14/14 | SYR4 |
| Gross Beta Particle Activity | 7.23 pCi/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 13.52 pCi/L — JACKRABBIT ROAD PUD · 8,346 people · 2017 | 10/14 | SYR4 |
| Trichloroacetic Acid | 12.33 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 11/14 | SYR4 |
| Xylenes, Total | 8.975 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 12 µg/L — HARRIS COUNTY MUD 183 · 3,981 people · 2019 | 6/14 | SYR4 |
| Monochloroacetic Acid | 9.275 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 11.82 µg/L — HARRIS COUNTY MUD 276 · 5,094 people · 2019 | 11/14 | SYR4 |
| Combined Uranium | 10.77 µg/L 36% of the EPA limit 30 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 5/14 | SYR4 |
| Selenium | 10.56 µg/L 21% of the EPA limit 50 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 6/14 | SYR4 |
| Bromoform | 8.655 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 13/14 | SYR4 |
| Arsenic | 7.08 µg/L 71% of the EPA limit 10 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 4/14 | SYR4 |
| Dibromochloromethane | 5.2 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 7.05 µg/L — LANGHAM CREEK UTILITY DISTRICT · 10,377 people · 2019 | 14/14 | SYR4 |
| Monobromoacetic Acid | 3.975 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 6.995 µg/L — BARKER CYPRESS MUD · 8,976 people · 2019 | 3/14 | SYR4 |
| Combined Radium (-226 And -228) | 3.63 pCi/L 73% of the EPA limit 5 pCi/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 6.555 pCi/L — JACKRABBIT ROAD PUD · 8,346 people · 2012 | 11/14 | SYR4 |
| Toluene | 1 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 5.8 µg/L — HARRIS COUNTY MUD 276 · 5,094 people · 2019 | 4/14 | SYR4 |
| Dibromoacetic Acid | 3.43 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019
Highest in the ZIP: 4.95 µg/L — JACKRABBIT ROAD PUD · 8,346 people · 2019 | 13/14 | SYR4 |
| Ethylbenzene | 2.075 µg/L 0.3% of the EPA limit 700 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 3/14 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.58 µg/L 26% of the EPA limit 6 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 7/14 | SYR4 |
| Dichloromethane | 0.5000 µg/L 10% of the EPA limit 5 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 1/14 | SYR4 |
| Atrazine | 0.4650 µg/L 16% of the EPA limit 3 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 12/14 | SYR4 |
| Hexachlorocyclopentadiene | 0.2150 µg/L 0.4% of the EPA limit 50 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 4/14 | SYR4 |
| Simazine | 0.2030 µg/L 5.1% of the EPA limit 4 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 12/14 | SYR4 |
| 6:2 Fts | 0.0426 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2025 | 2/14 | UCMR-5 |
| Benzo(A)Pyrene | 0.0400 µg/L 20% of the EPA limit 0.2000 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 1/14 | SYR4 |
| Pfba | 0.0106 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2025
Highest in the ZIP: 0.0272 µg/L — SPENCER ROAD PUD · 5,607 people · 2024 | 12/14 | UCMR-5 |
| PFHXS | 0.0153 µg/L No EPA limit set Highest in the ZIP: SPENCER ROAD PUD · 5,607 people · 2024 | 7/14 | UCMR-5 |
| Pfhxa | 0.0051 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2025
Highest in the ZIP: 0.0107 µg/L — SPENCER ROAD PUD · 5,607 people · 2024 | 12/14 | UCMR-5 |
| Endrin | 0.0100 µg/L 0.5% of the EPA limit 2 µg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2019 | 1/14 | SYR4 |
| PFOS | 0.0097 µg/L No EPA limit set Highest in the ZIP: SPENCER ROAD PUD · 5,607 people · 2024 | 1/14 | UCMR-5 |
| Pfpea | 0.0067 µg/L No EPA limit set Main supplier: CITY OF HOUSTON · 2,970,543 people · 2025
Highest in the ZIP: 0.0092 µg/L — SPENCER ROAD PUD · 5,607 people · 2024 | 12/14 | UCMR-5 |
| Lead | 0.0050 mg/L 33% of the EPA limit 0.0150 mg/L Main supplier: CITY OF HOUSTON · 2,970,543 people · 2024 | 14/14 | LCR |
| Pfhpa | 0.0048 µg/L No EPA limit set Highest in the ZIP: SPENCER ROAD PUD · 5,607 people · 2024 | 1/14 | UCMR-5 |
| PFBS | 0.0046 µg/L No EPA limit set Highest in the ZIP: HARRIS COUNTY MUD 102 · 10,401 people · 2023 | 7/14 | UCMR-5 |
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 77084
| Supplier | State | Population served |
|---|---|---|
| CITY OF HOUSTON | TX | 2,970,543 |
| NORTHAMPTON MUD | TX | 12,162 |
| HARRIS COUNTY UD 6 | TX | 11,262 |
| HARRIS COUNTY MUD 102 | TX | 10,401 |
| LANGHAM CREEK UTILITY DISTRICT | TX | 10,377 |
| BARKER CYPRESS MUD | TX | 8,976 |
| JACKRABBIT ROAD PUD | TX | 8,346 |
| ADDICKS UTILITY DISTRICT | TX | 8,076 |
| HARRIS COUNTY MUD 238 | TX | 7,773 |
| SPENCER ROAD PUD | TX | 5,607 |
| HARRIS COUNTY MUD 276 | TX | 5,094 |
| HARRIS COUNTY MUD 185 | TX | 4,617 |
| HARRIS COUNTY MUD 183 | TX | 3,981 |
| WESTLAKE MUD 1 | TX | 3,909 |
Frequently asked questions about ZIP 77084 tap water
Is the tap water in ZIP 77084 safe to drink?
EPA testing detected 46 contaminants across the water suppliers serving ZIP 77084. 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 77084?
14 public water suppliers report EPA drinking-water monitoring for ZIP 77084. Each is listed above with its population served.
What contaminants are in ZIP 77084's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Copper, Fluoride, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.