What was found in ZIP 75021
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 | 430.4 µg/L 11% of the EPA limit 4000 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019
Highest in the ZIP: 2257.5 µg/L — SOUTHWEST FANNIN COUNTY SUD · 9,198 people · 2018 | 2/3 | SYR4 |
| Chlorite | 780 µg/L 78% of the EPA limit 1000 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019 | 1/3 | SYR4 |
| Nitrate | 508.8 µg/L 5.1% of the EPA limit 10000 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019 | 2/3 | SYR4 |
| Nitrate-Nitrite | 504 µg/L 5% of the EPA limit 10000 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2012 | 3/3 | SYR4 |
| Copper | 169.2 µg/L 13% of the EPA limit 1300 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019
Highest in the ZIP: 288.5 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2018 | 3/3 | SYR4 |
| TTHM | 91.13 µg/L 114% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019
Highest in the ZIP: 122.275 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 3/3 | SYR4 |
| Barium | 112.25 µg/L 5.6% of the EPA limit 2000 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019 | 3/3 | SYR4 |
| Chloroform | 54.42 µg/L No EPA limit set Main supplier: CITY OF DENISON · 27,500 people · 2019
Highest in the ZIP: 94.645 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 3/3 | SYR4 |
| Cyanide | 83.59 µg/L 42% of the EPA limit 200 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019 | 2/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 44.22 µg/L 74% of the EPA limit 60 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019
Highest in the ZIP: 62.71 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 3/3 | SYR4 |
| Nitrite | 47.7 µg/L 4.8% of the EPA limit 1000 µg/L Highest in the ZIP: SOUTHWEST FANNIN COUNTY SUD · 9,198 people · 2019 | 1/3 | SYR4 |
| Dibromochloromethane | 38.8 µg/L No EPA limit set Main supplier: CITY OF DENISON · 27,500 people · 2019 | 3/3 | SYR4 |
| Lithium | 20.1 µg/L No EPA limit set Main supplier: CITY OF DENISON · 27,500 people · 2025
Highest in the ZIP: 38 µg/L — SOUTHWEST FANNIN COUNTY SUD · 9,198 people · 2024 | 2/3 | UCMR-5 |
| Trichloroacetic Acid | 19.5 µg/L No EPA limit set Main supplier: CITY OF DENISON · 27,500 people · 2019
Highest in the ZIP: 36.03 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 2/3 | SYR4 |
| Bromoform | 30.665 µg/L No EPA limit set Main supplier: CITY OF DENISON · 27,500 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 24.31 µg/L No EPA limit set Main supplier: CITY OF DENISON · 27,500 people · 2019
Highest in the ZIP: 30.355 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 24.045 µg/L No EPA limit set Main supplier: CITY OF DENISON · 27,500 people · 2019
Highest in the ZIP: 24.055 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 3/3 | SYR4 |
| Lead | 4.1185 µg/L 27% of the EPA limit 15 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019
Highest in the ZIP: 18.392 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2018 | 3/3 | SYR4 |
| Dibromoacetic Acid | 15.15 µg/L No EPA limit set Main supplier: CITY OF DENISON · 27,500 people · 2019 | 3/3 | SYR4 |
| Monobromoacetic Acid | 9 µg/L No EPA limit set Main supplier: CITY OF DENISON · 27,500 people · 2019 | 3/3 | SYR4 |
| Monochloroacetic Acid | 4.9 µg/L No EPA limit set Main supplier: CITY OF DENISON · 27,500 people · 2019
Highest in the ZIP: 8.368 µg/L — BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 2/3 | SYR4 |
| Selenium | 7.774 µg/L 16% of the EPA limit 50 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019 | 1/3 | SYR4 |
| Gross Beta Particle Activity | 5.1 pCi/L No EPA limit set Main supplier: CITY OF DENISON · 27,500 people · 2017 | 2/3 | SYR4 |
| Chromium | 5.046 µg/L 5% of the EPA limit 100 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019 | 2/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.4 pCi/L 23% of the EPA limit 15 pCi/L Highest in the ZIP: SOUTHWEST FANNIN COUNTY SUD · 9,198 people · 2018 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Main supplier: CITY OF DENISON · 27,500 people · 2017
Highest in the ZIP: 2.83 pCi/L — SOUTHWEST FANNIN COUNTY SUD · 9,198 people · 2016 | 3/3 | SYR4 |
| Arsenic | 2.408 µg/L 24% of the EPA limit 10 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019 | 1/3 | SYR4 |
| Carbon Tetrachloride | 1.11 µg/L 22% of the EPA limit 5 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019 | 1/3 | SYR4 |
| 2,4-D | 0.9000 µg/L 1.3% of the EPA limit 70 µg/L Highest in the ZIP: BRYAN CO. RWS & SWMD #2 · 6,270 people · 2019 | 1/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.5000 µg/L 8.3% of the EPA limit 6 µg/L Highest in the ZIP: SOUTHWEST FANNIN COUNTY SUD · 9,198 people · 2019 | 1/3 | SYR4 |
| Thallium, Total | 0.3170 µg/L 16% of the EPA limit 2 µg/L Main supplier: CITY OF DENISON · 27,500 people · 2019 | 1/3 | SYR4 |
| Lead | 0.0018 mg/L 12% of the EPA limit 0.0150 mg/L Main supplier: CITY OF DENISON · 27,500 people · 2025 | 3/3 | 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 75021
| Supplier | State | Population served |
|---|---|---|
| CITY OF DENISON | TX | 27,500 |
| SOUTHWEST FANNIN COUNTY SUD | TX | 9,198 |
| BRYAN CO. RWS & SWMD #2 | OK | 6,270 |
Frequently asked questions about ZIP 75021 tap water
Is the tap water in ZIP 75021 safe to drink?
EPA testing detected 32 contaminants across the water suppliers serving ZIP 75021. 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 75021?
3 public water suppliers report EPA drinking-water monitoring for ZIP 75021. Each is listed above with its population served.
What contaminants are in ZIP 75021's water?
EPA monitoring detected Fluoride, Chlorite, Nitrate, Nitrate-Nitrite, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.