Lead in Lewistown, MT Drinking Water
Lead data for Lewistown, Montana · 9,215 residents · 1 ZIP code
For residents of Lewistown, Montana, Lead has appeared in public water supply sampling data.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-04-05
Lead in Lewistown Tap Water
Lead has been detected in Lewistown, Montana drinking water at a maximum level of 5 ppb — below the EPA action level of 15 ppb (action level).
This analysis covers 9,215 residents across 1 ZIP code in Lewistown.
Lewistown's overall water quality grade is D (40/100).
Is Lead in Lewistown Water Safe?
If you live in an affected ZIP code, consider installing a reverse osmosis or nsf 53 carbon block filter certified under NSF 53 / NSF 58 and testing your water independently.
Lead Levels by ZIP Code
| ZIP Code | Lead Level | EPA Limit | Status |
|---|---|---|---|
| 59457 | 5 ppb | 15 ppb (action level) | OK |
Average lead level across Lewistown: 5 ppb
EPA Violations for Lead in Lewistown
| Date | Violation Type | Status | ZIP Code |
|---|---|---|---|
| 2025-10-01 | Lead (combined) (Known) | Known | 59457 |
| 2025-07-01 | Lead (combined) (Known) | Known | 59457 |
| 2025-04-01 | Lead (combined) (Known) | Known | 59457 |
| 2025-01-01 | Lead (combined) (Known) | Known | 59457 |
| 2024-10-01 | Lead (combined) (Known) | Known | 59457 |
| 2024-07-01 | Lead (combined) (Known) | Known | 59457 |
| 2024-04-01 | Lead (combined) (Known) | Known | 59457 |
| 2024-01-01 | Lead (combined) (Known) | Known | 59457 |
| 2023-10-01 | Lead (combined) (Known) | Known | 59457 |
| 2023-07-01 | Lead (combined) (Known) | Known | 59457 |
| 2023-04-01 | Lead (combined) (Known) | Known | 59457 |
| 2023-01-01 | Lead (combined) (Known) | Known | 59457 |
| 2022-10-01 | Lead (combined) (Known) | Known | 59457 |
| 2022-07-01 | Lead (combined) (Known) | Known | 59457 |
| 2022-04-01 | Lead (combined) (Known) | Known | 59457 |
Health Effects of Lead
- Brain development delays and reduced IQ in children
- Behavioral problems and learning disabilities
- High blood pressure and kidney damage in adults
- Increased risk of premature birth in pregnant women
Health risk severity: High. Governed by the Lead and Copper Rule Revisions (LCRR/LCRI).
How Lead Gets Into Drinking Water
- Corrosion of lead service lines (pipes connecting water main to home)
- Lead solder in copper plumbing joints (pre-1986 homes)
- Brass fixtures and faucets manufactured before 2014
- Stagnant water that sits in lead-containing pipes overnight
What to Do About Lead in Lewistown Water
- Install an NSF 53 or NSF 58 certified filter at kitchen sink
- Run cold water for 30 seconds before using for drinking or cooking
- Use cold water only for cooking and preparing formula
- Consider whole-home reverse osmosis if lead service line is present
Look for filters certified under NSF 53 / NSF 58 for lead removal.