What was found in ZIP 77521
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 | 2555.5 µg/L 64% of the EPA limit 4000 µg/L Highest in the ZIP: CITY OF MONT BELVIEU · 12,864 people · 2019 | 1/4 | SYR4 |
| Copper | 695 µg/L 53% of the EPA limit 1300 µg/L Main supplier: CITY OF BAYTOWN · 86,004 people · 2018
Highest in the ZIP: 835.8 µg/L — SPRING MEADOWS MUD · 4,200 people · 2019 | 4/4 | SYR4 |
| Barium | 118.2 µg/L 5.9% of the EPA limit 2000 µg/L Highest in the ZIP: CITY OF MONT BELVIEU · 12,864 people · 2019 | 1/4 | SYR4 |
| TTHM | 60.88 µg/L 76% of the EPA limit 80 µg/L Main supplier: CITY OF BAYTOWN · 86,004 people · 2019
Highest in the ZIP: 74.43 µg/L — SPRING MEADOWS MUD · 4,200 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 60.99 µg/L 102% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: CITY OF BAYTOWN · 86,004 people · 2019 | 4/4 | SYR4 |
| Chloroform | 44.7 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2019
Highest in the ZIP: 45.36 µg/L — SPRING MEADOWS MUD · 4,200 people · 2019 | 4/4 | SYR4 |
| Dichloroacetic Acid | 39.21 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 7.13 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2019
Highest in the ZIP: 34.2 µg/L — CITY OF MONT BELVIEU · 12,864 people · 2019 | 4/4 | SYR4 |
| Bromodichloromethane | 17.33 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2019
Highest in the ZIP: 27.4 µg/L — CITY OF MONT BELVIEU · 12,864 people · 2019 | 4/4 | SYR4 |
| Lithium | 13.8 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2024
Highest in the ZIP: 26.7 µg/L — CITY OF MONT BELVIEU · 12,864 people · 2025 | 2/4 | UCMR-5 |
| Trichloroacetic Acid | 16.37 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2019 | 4/4 | SYR4 |
| Bromoform | 2.1 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2019
Highest in the ZIP: 15.98 µg/L — CITY OF MONT BELVIEU · 12,864 people · 2019 | 4/4 | SYR4 |
| Lead | 12 µg/L 80% of the EPA limit 15 µg/L Main supplier: CITY OF BAYTOWN · 86,004 people · 2018
Highest in the ZIP: 12.42 µg/L — CITY OF MONT BELVIEU · 12,864 people · 2019 | 4/4 | SYR4 |
| Nitrate | 10 µg/L 0.1% of the EPA limit 10000 µg/L Highest in the ZIP: CITY OF MONT BELVIEU · 12,864 people · 2019 | 1/4 | SYR4 |
| Nitrate-Nitrite | 10 µg/L 0.1% of the EPA limit 10000 µg/L Highest in the ZIP: CITY OF MONT BELVIEU · 12,864 people · 2015 | 1/4 | SYR4 |
| Dibromoacetic Acid | 4.015 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2019
Highest in the ZIP: 8.08 µg/L — LAKE MUD · 6,048 people · 2019 | 4/4 | SYR4 |
| Monochloroacetic Acid | 5.75 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2019
Highest in the ZIP: 7.26 µg/L — SPRING MEADOWS MUD · 4,200 people · 2019 | 3/4 | SYR4 |
| Arsenic | 5.57 µg/L 56% of the EPA limit 10 µg/L Highest in the ZIP: CITY OF MONT BELVIEU · 12,864 people · 2019 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Highest in the ZIP: CITY OF MONT BELVIEU · 12,864 people · 2015 | 1/4 | SYR4 |
| Monobromoacetic Acid | 1.4 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2019 | 1/4 | SYR4 |
| Xylenes, Total | 1.1 µg/L 0% of the EPA limit 10000 µg/L Highest in the ZIP: CITY OF MONT BELVIEU · 12,864 people · 2019 | 1/4 | SYR4 |
| Pfba | 0.0146 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2024 | 3/4 | UCMR-5 |
| Pfpea | 0.0102 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2024 | 3/4 | UCMR-5 |
| Pfhxa | 0.0098 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2024 | 3/4 | UCMR-5 |
| PFOS | 0.0060 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2024 | 1/4 | UCMR-5 |
| PFBS | 0.0057 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2024 | 3/4 | UCMR-5 |
| PFHXS | 0.0051 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2024 | 1/4 | UCMR-5 |
| Pfhpa | 0.0037 µg/L No EPA limit set Main supplier: CITY OF BAYTOWN · 86,004 people · 2024 | 1/4 | UCMR-5 |
| Lead | 0.0021 mg/L 14% of the EPA limit 0.0150 mg/L Main supplier: CITY OF BAYTOWN · 86,004 people · 2025
Highest in the ZIP: 0.0025 mg/L — CITY OF MONT BELVIEU · 12,864 people · 2026 | 4/4 | 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 77521
| Supplier | State | Population served |
|---|---|---|
| CITY OF BAYTOWN | TX | 86,004 |
| CITY OF MONT BELVIEU | TX | 12,864 |
| LAKE MUD | TX | 6,048 |
| SPRING MEADOWS MUD | TX | 4,200 |
Frequently asked questions about ZIP 77521 tap water
Is the tap water in ZIP 77521 safe to drink?
EPA testing detected 29 contaminants across the water suppliers serving ZIP 77521. 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 77521?
4 public water suppliers report EPA drinking-water monitoring for ZIP 77521. Each is listed above with its population served.
What contaminants are in ZIP 77521's water?
EPA monitoring detected Fluoride, Copper, Barium, TTHM, Total Haloacetic Acids (HAA5), and others across this ZIP's suppliers. The full list with levels and sources is above.