What was found in ZIP 83854
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 | 1390 µg/L 14% of the EPA limit 10000 µg/L Main supplier: POST FALLS CITY OF · 20,285 people · 2019
Highest in the ZIP: 2120 µg/L — EAST GREENACRES IRRIGATION DIST · 11,165 people · 2019 | 3/3 | SYR4 |
| Nitrate-Nitrite | 1328.5 µg/L 13% of the EPA limit 10000 µg/L Main supplier: POST FALLS CITY OF · 20,285 people · 2019
Highest in the ZIP: 1852 µg/L — EAST GREENACRES IRRIGATION DIST · 11,165 people · 2019 | 3/3 | SYR4 |
| Barium | 1703.15 µg/L 85% of the EPA limit 2000 µg/L Main supplier: POST FALLS CITY OF · 20,285 people · 2019 | 3/3 | SYR4 |
| Fluoride | 300 µg/L 7.5% of the EPA limit 4000 µg/L Main supplier: POST FALLS CITY OF · 20,285 people · 2019
Highest in the ZIP: 362.5 µg/L — ROSS POINT WATER DIST · 8,965 people · 2019 | 2/3 | SYR4 |
| Arsenic | 5.5815 µg/L 56% of the EPA limit 10 µg/L Main supplier: POST FALLS CITY OF · 20,285 people · 2019
Highest in the ZIP: 8.43 µg/L — ROSS POINT WATER DIST · 8,965 people · 2019 | 3/3 | SYR4 |
| Combined Uranium | 1.364 µg/L 4.5% of the EPA limit 30 µg/L Main supplier: POST FALLS CITY OF · 20,285 people · 2019
Highest in the ZIP: 3.304 µg/L — EAST GREENACRES IRRIGATION DIST · 11,165 people · 2019 | 3/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.67 pCi/L 18% of the EPA limit 15 pCi/L Main supplier: POST FALLS CITY OF · 20,285 people · 2019
Highest in the ZIP: 3.28 pCi/L — EAST GREENACRES IRRIGATION DIST · 11,165 people · 2019 | 3/3 | SYR4 |
| Xylenes, Total | 1.23 µg/L 0% of the EPA limit 10000 µg/L Main supplier: POST FALLS CITY OF · 20,285 people · 2019 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.0085 pCi/L 20% of the EPA limit 5 pCi/L Main supplier: POST FALLS CITY OF · 20,285 people · 2016 | 3/3 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: POST FALLS CITY OF · 20,285 people · 2025
Highest in the ZIP: 0.0030 mg/L — EAST GREENACRES IRRIGATION DIST · 11,165 people · 2024 | 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 83854
| Supplier | State | Population served |
|---|---|---|
| POST FALLS CITY OF | ID | 20,285 |
| EAST GREENACRES IRRIGATION DIST | ID | 11,165 |
| ROSS POINT WATER DIST | ID | 8,965 |
Frequently asked questions about ZIP 83854 tap water
Is the tap water in ZIP 83854 safe to drink?
EPA testing detected 10 contaminants across the water suppliers serving ZIP 83854. 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 83854?
3 public water suppliers report EPA drinking-water monitoring for ZIP 83854. Each is listed above with its population served.
What contaminants are in ZIP 83854's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Barium, Fluoride, Arsenic, and others across this ZIP's suppliers. The full list with levels and sources is above.