What was found in ZIP 83301
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-Nitrite | 4737 µg/L 47% of the EPA limit 10000 µg/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2012 | 1/1 | SYR4 |
| Nitrate | 4070 µg/L 41% of the EPA limit 10000 µg/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2019 | 1/1 | SYR4 |
| Fluoride | 961 µg/L 24% of the EPA limit 4000 µg/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2012 | 1/1 | SYR4 |
| Barium | 63.07 µg/L 3.2% of the EPA limit 2000 µg/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2012 | 1/1 | SYR4 |
| Lithium | 47.7 µg/L No EPA limit set Main supplier: TWIN FALLS CITY OF · 56,121 people · 2025 | 1/1 | UCMR-5 |
| TTHM | 40.36 µg/L 50% of the EPA limit 80 µg/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2019 | 1/1 | SYR4 |
| Arsenic | 12.01 µg/L 120% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 8.42 µg/L 14% of the EPA limit 60 µg/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 5.7 µg/L 19% of the EPA limit 30 µg/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2019 | 1/1 | SYR4 |
| Selenium | 2.384 µg/L 4.8% of the EPA limit 50 µg/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2012 | 1/1 | SYR4 |
| Chromium | 2.061 µg/L 2.1% of the EPA limit 100 µg/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2012 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 1.4 pCi/L 28% of the EPA limit 5 pCi/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2019 | 1/1 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.6000 pCi/L 4% of the EPA limit 15 pCi/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: TWIN FALLS CITY OF · 56,121 people · 2026 | 1/1 | 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 83301
| Supplier | State | Population served |
|---|---|---|
| TWIN FALLS CITY OF | ID | 56,121 |
Frequently asked questions about ZIP 83301 tap water
Is the tap water in ZIP 83301 safe to drink?
EPA testing detected 14 contaminants across the water suppliers serving ZIP 83301. 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 83301?
1 public water supplier report EPA drinking-water monitoring for ZIP 83301. Each is listed above with its population served.
What contaminants are in ZIP 83301's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Barium, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.