What was found in ZIP 78121
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 |
|---|---|---|---|
| Copper | 179.79999999999995 µg/L 14% of the EPA limit 1300 µg/L Main supplier: EAST CENTRAL SUD · 26,137 people · 2019
Highest in the ZIP: 701.5 µg/L — SS WSC · 20,826 people · 2017 | 2/2 | SYR4 |
| Fluoride | 476 µg/L 12% of the EPA limit 4000 µg/L Highest in the ZIP: SS WSC · 20,826 people · 2019 | 1/2 | SYR4 |
| Barium | 171.4 µg/L 8.6% of the EPA limit 2000 µg/L Highest in the ZIP: SS WSC · 20,826 people · 2019 | 1/2 | SYR4 |
| Nitrate | 70 µg/L 0.7% of the EPA limit 10000 µg/L Highest in the ZIP: SS WSC · 20,826 people · 2019 | 1/2 | SYR4 |
| Nitrate-Nitrite | 58.5 µg/L 0.6% of the EPA limit 10000 µg/L Highest in the ZIP: SS WSC · 20,826 people · 2015 | 1/2 | SYR4 |
| TTHM | 52.93999999999995 µg/L 66% of the EPA limit 80 µg/L Main supplier: EAST CENTRAL SUD · 26,137 people · 2019 | 2/2 | SYR4 |
| Lithium | 40.1 µg/L No EPA limit set Main supplier: EAST CENTRAL SUD · 26,137 people · 2024
Highest in the ZIP: 49.4 µg/L — SS WSC · 20,826 people · 2024 | 2/2 | UCMR-5 |
| Cyanide | 40 µg/L 20% of the EPA limit 200 µg/L Highest in the ZIP: SS WSC · 20,826 people · 2017 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 21.959999999999987 µg/L 37% of the EPA limit 60 µg/L Main supplier: EAST CENTRAL SUD · 26,137 people · 2019 | 2/2 | SYR4 |
| Bromoform | 17.479999999999997 µg/L No EPA limit set Main supplier: EAST CENTRAL SUD · 26,137 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 16.915 µg/L No EPA limit set Main supplier: EAST CENTRAL SUD · 26,137 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 16.279999999999973 µg/L No EPA limit set Main supplier: EAST CENTRAL SUD · 26,137 people · 2019 | 2/2 | SYR4 |
| Chloroform | 13.049999999999999 µg/L No EPA limit set Main supplier: EAST CENTRAL SUD · 26,137 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 11.639999999999999 µg/L No EPA limit set Main supplier: EAST CENTRAL SUD · 26,137 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 7.319999999999999 pCi/L No EPA limit set Highest in the ZIP: SS WSC · 20,826 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 6.719999999999999 µg/L No EPA limit set Main supplier: EAST CENTRAL SUD · 26,137 people · 2019 | 2/2 | SYR4 |
| Lead | 6.589999999999999 µg/L 44% of the EPA limit 15 µg/L Main supplier: EAST CENTRAL SUD · 26,137 people · 2019 | 2/2 | SYR4 |
| Selenium | 4.24 µg/L 8.5% of the EPA limit 50 µg/L Highest in the ZIP: SS WSC · 20,826 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 4.22 µg/L No EPA limit set Main supplier: EAST CENTRAL SUD · 26,137 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 2.6 µg/L No EPA limit set Main supplier: EAST CENTRAL SUD · 26,137 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 2.48 pCi/L 50% of the EPA limit 5 pCi/L Highest in the ZIP: SS WSC · 20,826 people · 2016 | 1/2 | SYR4 |
| Monobromoacetic Acid | 2.2 µg/L No EPA limit set Main supplier: EAST CENTRAL SUD · 26,137 people · 2019 | 2/2 | SYR4 |
| Lead | 0.0015 mg/L 10% of the EPA limit 0.0150 mg/L Main supplier: EAST CENTRAL SUD · 26,137 people · 2025 | 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 78121
| Supplier | State | Population served |
|---|---|---|
| EAST CENTRAL SUD | TX | 26,137 |
| SS WSC | TX | 20,826 |
Frequently asked questions about ZIP 78121 tap water
Is the tap water in ZIP 78121 safe to drink?
EPA testing detected 23 contaminants across the water suppliers serving ZIP 78121. 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 78121?
2 public water suppliers report EPA drinking-water monitoring for ZIP 78121. Each is listed above with its population served.
What contaminants are in ZIP 78121's water?
EPA monitoring detected Copper, Fluoride, Barium, Nitrate, Nitrate-Nitrite, and others across this ZIP's suppliers. The full list with levels and sources is above.