What was found in ZIP 77320
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 | 5397.5 µg/L 54% of the EPA limit 10000 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 2957.5 µg/L 30% of the EPA limit 10000 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2015 | 2/2 | SYR4 |
| Copper | 768.2 µg/L 59% of the EPA limit 1300 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2017 | 2/2 | SYR4 |
| Fluoride | 613.5 µg/L 15% of the EPA limit 4000 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2017
Highest in the ZIP: 760 µg/L — RIVERSIDE SUD · 6,246 people · 2017 | 2/2 | SYR4 |
| Barium | 141.95 µg/L 7.1% of the EPA limit 2000 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2017 | 2/2 | SYR4 |
| TTHM | 51.875 µg/L 65% of the EPA limit 80 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019
Highest in the ZIP: 129 µg/L — RIVERSIDE SUD · 6,246 people · 2019 | 2/2 | SYR4 |
| Lithium | 60.2 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2024
Highest in the ZIP: 60.3 µg/L — RIVERSIDE SUD · 6,246 people · 2025 | 2/2 | UCMR-5 |
| Dibromochloromethane | 20.9 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019
Highest in the ZIP: 49.22 µg/L — RIVERSIDE SUD · 6,246 people · 2019 | 2/2 | SYR4 |
| Cyanide | 39.5 µg/L 20% of the EPA limit 200 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2017
Highest in the ZIP: 40 µg/L — RIVERSIDE SUD · 6,246 people · 2017 | 2/2 | SYR4 |
| Bromodichloromethane | 14.2 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019
Highest in the ZIP: 36.98 µg/L — RIVERSIDE SUD · 6,246 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 16.34 µg/L 27% of the EPA limit 60 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019
Highest in the ZIP: 31.51 µg/L — RIVERSIDE SUD · 6,246 people · 2019 | 2/2 | SYR4 |
| Chloroform | 13.66 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019
Highest in the ZIP: 24.995 µg/L — RIVERSIDE SUD · 6,246 people · 2019 | 2/2 | SYR4 |
| Bromoform | 12.64 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019
Highest in the ZIP: 17.98 µg/L — RIVERSIDE SUD · 6,246 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 4.995 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019
Highest in the ZIP: 13.795 µg/L — RIVERSIDE SUD · 6,246 people · 2019 | 2/2 | SYR4 |
| Lead | 13.4 µg/L 89% of the EPA limit 15 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2017 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 12.625 pCi/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2017 | 2/2 | SYR4 |
| Dichloroacetic Acid | 9.7 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019
Highest in the ZIP: 12.275 µg/L — RIVERSIDE SUD · 6,246 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 4.5 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019
Highest in the ZIP: 10.89 µg/L — RIVERSIDE SUD · 6,246 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 7.265 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019
Highest in the ZIP: 10.145 µg/L — RIVERSIDE SUD · 6,246 people · 2019 | 2/2 | SYR4 |
| Nitrite | 10 µg/L 1% of the EPA limit 1000 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2015 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.8 pCi/L 32% of the EPA limit 15 pCi/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2017 | 1/2 | SYR4 |
| Monochloroacetic Acid | 4.025 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019 | 2/2 | SYR4 |
| Arsenic | 3.695 µg/L 37% of the EPA limit 10 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2017 | 1/2 | SYR4 |
| Xylenes, Total | 1.17 µg/L 0% of the EPA limit 10000 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019
Highest in the ZIP: 2.9 µg/L — RIVERSIDE SUD · 6,246 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 2.45 pCi/L 49% of the EPA limit 5 pCi/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2017 | 2/2 | SYR4 |
| Dalapon | 1.74 µg/L 0.9% of the EPA limit 200 µg/L Highest in the ZIP: RIVERSIDE SUD · 6,246 people · 2019 | 1/2 | SYR4 |
| Carbon Tetrachloride | 0.5000 µg/L 10% of the EPA limit 5 µg/L Highest in the ZIP: RIVERSIDE SUD · 6,246 people · 2019 | 1/2 | SYR4 |
| Ethylbenzene | 0.5000 µg/L 0.1% of the EPA limit 700 µg/L Highest in the ZIP: RIVERSIDE SUD · 6,246 people · 2019 | 1/2 | SYR4 |
| Simazine | 0.2400 µg/L 6% of the EPA limit 4 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019 | 1/2 | SYR4 |
| Atrazine | 0.1285 µg/L 4.3% of the EPA limit 3 µg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2019 | 1/2 | SYR4 |
| Pfpea | 0.0194 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2024 | 2/2 | UCMR-5 |
| Pfhxa | 0.0179 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2024 | 1/2 | UCMR-5 |
| Pfba | 0.0129 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2024 | 1/2 | UCMR-5 |
| PFBS | 0.0095 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2024 | 2/2 | UCMR-5 |
| PFOS | 0.0089 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2024 | 1/2 | UCMR-5 |
| PFHXS | 0.0083 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2024 | 1/2 | UCMR-5 |
| Pfhpa | 0.0067 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2024 | 1/2 | UCMR-5 |
| PFOA | 0.0060 µg/L No EPA limit set Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0037 mg/L 25% of the EPA limit 0.0150 mg/L Main supplier: CITY OF HUNTSVILLE · 48,522 people · 2023 | 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 77320
| Supplier | State | Population served |
|---|---|---|
| CITY OF HUNTSVILLE | TX | 48,522 |
| RIVERSIDE SUD | TX | 6,246 |
Frequently asked questions about ZIP 77320 tap water
Is the tap water in ZIP 77320 safe to drink?
EPA testing detected 39 contaminants across the water suppliers serving ZIP 77320. 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 77320?
2 public water suppliers report EPA drinking-water monitoring for ZIP 77320. Each is listed above with its population served.
What contaminants are in ZIP 77320'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.