What was found in ZIP 59758
The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Fluoride | 3900 µg/L 98% of the EPA limit 4000 µg/L | 1/1 | SYR4 |
| Copper | 638 µg/L 49% of the EPA limit 1300 µg/L | 1/1 | SYR4 |
| Nitrate-Nitrite | 179 µg/L 1.8% of the EPA limit 10000 µg/L | 1/1 | SYR4 |
| Lithium | 70 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Lead | 19.7 µg/L 131% of the EPA limit, in the worst sample — 15 µg/L | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 2.8 pCi/L 56% of the EPA limit 5 pCi/L | 1/1 | SYR4 |
| Arsenic | 2.79 µg/L 28% of the EPA limit 10 µg/L | 1/1 | SYR4 |
| Selenium | 2.59 µg/L 5.2% of the EPA limit 50 µg/L | 1/1 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.8 pCi/L 12% of the EPA limit 15 pCi/L | 1/1 | SYR4 |
| Barium | 1.11 µg/L 0.1% of the EPA limit 2000 µg/L | 1/1 | SYR4 |
| Antimony, Total | 0.3780 µg/L 6.3% of the EPA limit 6 µg/L | 1/1 | SYR4 |
| Mercury | 0.0176 µg/L 0.9% of the EPA limit 2 µg/L | 1/1 | SYR4 |
| Lead | 0.0013 mg/L 8.3% of the EPA limit 0.0150 mg/L | 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 single worst sample on
record — over 100% is worth reading, but is not by itself a violation.
Formal violations are listed separately.
Water suppliers serving ZIP 59758
| Supplier | State | Population served |
|---|---|---|
| WEST YELLOWSTONE TOWN OF | MT | 9,899 |
Frequently asked questions about ZIP 59758 tap water
Is the tap water in ZIP 59758 safe to drink?
EPA testing detected 13 contaminants across the water suppliers serving ZIP 59758. 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 59758?
1 public water supplier report EPA drinking-water monitoring for ZIP 59758. Each is listed above with its population served.
What contaminants are in ZIP 59758's water?
EPA monitoring detected Fluoride, Copper, Nitrate-Nitrite, Lithium, Lead, and others across this ZIP's suppliers. The full list with levels and sources is above.