What was found in ZIP 83501
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 | 6882 µg/L 69% of the EPA limit 10000 µg/L Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2019 | 1/2 | SYR4 |
| Nitrate | 6814.5 µg/L 68% of the EPA limit 10000 µg/L Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2019 | 1/2 | SYR4 |
| Fluoride | 3086.5 µg/L 77% of the EPA limit 4000 µg/L Main supplier: LEWISTON ORCHARDS IRRIGATION DIST · 20,000 people · 2018 | 2/2 | SYR4 |
| Nitrite | 374.3 µg/L 37% of the EPA limit 1000 µg/L Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2019 | 1/2 | SYR4 |
| Barium | 14.87 µg/L 0.7% of the EPA limit 2000 µg/L Main supplier: LEWISTON ORCHARDS IRRIGATION DIST · 20,000 people · 2019
Highest in the ZIP: 113 µg/L — LEWISTON CITY OF · 15,001 people · 2019 | 2/2 | SYR4 |
| TTHM | 12.28 µg/L 15% of the EPA limit 80 µg/L Main supplier: LEWISTON ORCHARDS IRRIGATION DIST · 20,000 people · 2019
Highest in the ZIP: 51.58 µg/L — LEWISTON CITY OF · 15,001 people · 2019 | 2/2 | SYR4 |
| Lithium | 39.4 µg/L No EPA limit set Main supplier: LEWISTON ORCHARDS IRRIGATION DIST · 20,000 people · 2024
Highest in the ZIP: 43.8 µg/L — LEWISTON CITY OF · 15,001 people · 2025 | 2/2 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 3.347 µg/L 5.6% of the EPA limit 60 µg/L Main supplier: LEWISTON ORCHARDS IRRIGATION DIST · 20,000 people · 2019
Highest in the ZIP: 37.73 µg/L — LEWISTON CITY OF · 15,001 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 24.521 µg/L 82% of the EPA limit 30 µg/L Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2019 | 1/2 | SYR4 |
| Gross Beta Particle Activity | 8.206 pCi/L No EPA limit set Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.1434 pCi/L 1% of the EPA limit 15 pCi/L Main supplier: LEWISTON ORCHARDS IRRIGATION DIST · 20,000 people · 2016
Highest in the ZIP: 7.245 pCi/L — LEWISTON CITY OF · 15,001 people · 2019 | 2/2 | SYR4 |
| Chloroform | 6.31 µg/L No EPA limit set Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2019 | 1/2 | SYR4 |
| Selenium | 3.364 µg/L 6.7% of the EPA limit 50 µg/L Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 3.2 µg/L No EPA limit set Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2019 | 1/2 | SYR4 |
| Chromium | 1.6565 µg/L 1.7% of the EPA limit 100 µg/L Main supplier: LEWISTON ORCHARDS IRRIGATION DIST · 20,000 people · 2019
Highest in the ZIP: 2.91 µg/L — LEWISTON CITY OF · 15,001 people · 2019 | 2/2 | SYR4 |
| Arsenic | 1.34 µg/L 13% of the EPA limit 10 µg/L Main supplier: LEWISTON ORCHARDS IRRIGATION DIST · 20,000 people · 2019
Highest in the ZIP: 2.149 µg/L — LEWISTON CITY OF · 15,001 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 1.15 µg/L No EPA limit set Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2019 | 1/2 | SYR4 |
| Cadmium | 1.07 µg/L 21% of the EPA limit 5 µg/L Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 0.7094 pCi/L 14% of the EPA limit 5 pCi/L Main supplier: LEWISTON ORCHARDS IRRIGATION DIST · 20,000 people · 2019
Highest in the ZIP: 0.9000 pCi/L — LEWISTON CITY OF · 15,001 people · 2017 | 2/2 | SYR4 |
| PFBS | 0.0056 µg/L No EPA limit set Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2025 | 1/2 | UCMR-5 |
| Pfpea | 0.0047 µg/L No EPA limit set Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2025 | 1/2 | UCMR-5 |
| Pfhxa | 0.0043 µg/L No EPA limit set Highest in the ZIP: LEWISTON CITY OF · 15,001 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: LEWISTON ORCHARDS IRRIGATION DIST · 20,000 people · 2024
Highest in the ZIP: 0.0010 mg/L — LEWISTON CITY OF · 15,001 people · 2025 | 2/2 | LCR |
| Asbestos | -0.34 MFL -4.9% of the EPA limit 7 MFL Main supplier: LEWISTON ORCHARDS IRRIGATION DIST · 20,000 people · 2013
Highest in the ZIP: -0.13 MFL — LEWISTON CITY OF · 15,001 people · 2013 | 2/2 | SYR4 |
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 83501
| Supplier | State | Population served |
|---|---|---|
| LEWISTON ORCHARDS IRRIGATION DIST | ID | 20,000 |
| LEWISTON CITY OF | ID | 15,001 |
Frequently asked questions about ZIP 83501 tap water
Is the tap water in ZIP 83501 safe to drink?
EPA testing detected 24 contaminants across the water suppliers serving ZIP 83501. 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 83501?
2 public water suppliers report EPA drinking-water monitoring for ZIP 83501. Each is listed above with its population served.
What contaminants are in ZIP 83501's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Nitrite, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.