What was found in ZIP 77346
The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Copper | 1930 µg/L 148% of the EPA limit, in the worst sample — 1300 µg/L | 12/12 | SYR4 |
| Fluoride | 1580 µg/L 40% of the EPA limit 4000 µg/L | 10/12 | SYR4 |
| Nitrate | 1230 µg/L 12% of the EPA limit 10000 µg/L | 5/12 | SYR4 |
| Barium | 400 µg/L 20% of the EPA limit 2000 µg/L | 11/12 | SYR4 |
| TTHM | 377 µg/L 471% of the EPA limit, in the worst sample — 80 µg/L | 7/12 | SYR4 |
| Nitrate-Nitrite | 350 µg/L 3.5% of the EPA limit 10000 µg/L | 4/12 | SYR4 |
| Chloroform | 349 µg/L No EPA limit set | 6/12 | SYR4 |
| Cyanide | 170 µg/L 85% of the EPA limit 200 µg/L | 2/12 | SYR4 |
| Total Haloacetic Acids (HAA5) | 92.4 µg/L 154% of the EPA limit, in the worst sample — 60 µg/L | 6/12 | SYR4 |
| Lead | 82.3 µg/L 549% of the EPA limit, in the worst sample — 15 µg/L | 11/12 | SYR4 |
| Trichloroacetic Acid | 58.5 µg/L No EPA limit set | 4/12 | SYR4 |
| Dichloroacetic Acid | 50.9 µg/L No EPA limit set | 5/12 | SYR4 |
| Nitrite | 50 µg/L 5% of the EPA limit 1000 µg/L | 2/12 | SYR4 |
| Lithium | 33.9 µg/L No EPA limit set | 11/12 | UCMR-5 |
| Bromodichloromethane | 26.8 µg/L No EPA limit set | 6/12 | SYR4 |
| Bromoform | 22 µg/L No EPA limit set | 4/12 | SYR4 |
| Dibromochloromethane | 20 µg/L No EPA limit set | 7/12 | SYR4 |
| Combined Uranium | 16.9 µg/L 56% of the EPA limit 30 µg/L | 1/12 | SYR4 |
| Chromium | 14.3 µg/L 14% of the EPA limit 100 µg/L | 1/12 | SYR4 |
| Dibromoacetic Acid | 13.3 µg/L No EPA limit set | 3/12 | SYR4 |
| Xylenes, Total | 13 µg/L 0.1% of the EPA limit 10000 µg/L | 5/12 | SYR4 |
| Selenium | 12.9 µg/L 26% of the EPA limit 50 µg/L | 2/12 | SYR4 |
| Monochloroacetic Acid | 11.9 µg/L No EPA limit set | 3/12 | SYR4 |
| Gross Alpha, Excl. Radon And U | 11.7 pCi/L 78% of the EPA limit 15 pCi/L | 6/12 | SYR4 |
| Arsenic | 11 µg/L 110% of the EPA limit, in the worst sample — 10 µg/L | 9/12 | SYR4 |
| Gross Beta Particle Activity | 8.7 pCi/L No EPA limit set | 4/12 | SYR4 |
| Combined Radium (-226 And -228) | 5.3 pCi/L 106% of the EPA limit, in the worst sample — 5 pCi/L | 9/12 | SYR4 |
| Monobromoacetic Acid | 4.5 µg/L No EPA limit set | 2/12 | SYR4 |
| Ethylbenzene | 2.2 µg/L 0.3% of the EPA limit 700 µg/L | 2/12 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.8 µg/L 30% of the EPA limit 6 µg/L | 4/12 | SYR4 |
| Toluene | 1 µg/L 0.1% of the EPA limit 1000 µg/L | 1/12 | SYR4 |
| Atrazine | 0.9100 µg/L 30% of the EPA limit 3 µg/L | 1/12 | SYR4 |
| 2,4-D | 0.9000 µg/L 1.3% of the EPA limit 70 µg/L | 1/12 | SYR4 |
| Dichloromethane | 0.5000 µg/L 10% of the EPA limit 5 µg/L | 1/12 | SYR4 |
| Simazine | 0.2900 µg/L 7.2% of the EPA limit 4 µg/L | 1/12 | SYR4 |
| Hexachlorocyclopentadiene | 0.2400 µg/L 0.5% of the EPA limit 50 µg/L | 1/12 | SYR4 |
| Bhc-Gamma | 0.0500 µg/L 25% of the EPA limit 0.2000 µg/L | 1/12 | SYR4 |
| 6:2 Fts | 0.0426 µg/L No EPA limit set | 1/12 | UCMR-5 |
| Benzo(A)Pyrene | 0.0400 µg/L 20% of the EPA limit 0.2000 µg/L | 1/12 | SYR4 |
| Pfba | 0.0106 µg/L No EPA limit set | 2/12 | UCMR-5 |
| Endrin | 0.0100 µg/L 0.5% of the EPA limit 2 µg/L | 1/12 | SYR4 |
| Pfpea | 0.0067 µg/L No EPA limit set | 2/12 | UCMR-5 |
| Pfhxa | 0.0051 µg/L No EPA limit set | 2/12 | UCMR-5 |
| Lead | 0.0050 mg/L 33% of the EPA limit 0.0150 mg/L | 12/12 | 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 single worst sample on
record — over 100% is worth reading, but is not by itself a violation.
Formal violations are listed separately.
Water suppliers serving ZIP 77346
| Supplier | State | Population served |
|---|---|---|
| CITY OF HOUSTON | TX | 2,970,543 |
| HARRIS COUNTY MUD 153 | TX | 11,781 |
| HARRIS COUNTY MUD 278 | TX | 10,584 |
| TRAIL OF THE LAKES MUD | TX | 9,480 |
| HARRIS COUNTY MUD 132 | TX | 8,682 |
| HARRIS COUNTY MUD 290 | TX | 8,259 |
| HARRIS COUNTY MUD 151 | TX | 7,464 |
| HARRIS COUNTY MUD 152 | TX | 7,314 |
| BRYAN CO. RWS & SWMD #2 | OK | 6,270 |
| HARRIS COUNTY MUD 46 | TX | 5,418 |
| HARRIS COUNTY MUD 400 - WEST | TX | 5,217 |
| HARRIS COUNTY MUD 106 | TX | 4,668 |
Frequently asked questions about ZIP 77346 tap water
Is the tap water in ZIP 77346 safe to drink?
EPA testing detected 44 contaminants across the water suppliers serving ZIP 77346. 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 77346?
12 public water suppliers report EPA drinking-water monitoring for ZIP 77346. Each is listed above with its population served.
What contaminants are in ZIP 77346's water?
EPA monitoring detected Copper, Fluoride, Nitrate, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.