Lake Mc Donald, MT: High Radon Risk — 40/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
For households across Lake Mc Donald, below-average water safety data and recurring compliance violations documented by MT EPA records make it worthwhile to verify the specific system serving your address — system-level detail is the most actionable reference point available.
How Lake Mc Donald Compares
Data: EPA SDWIS Last verified: 2026-06-03
Lake Mc Donald Water: The Quick Version
- Estimated remediation: $1,200 per household.
- CDC health risk index: 12.11 — above typical levels.
Water Systems Serving Lake Mc Donald
Most residential addresses in Lake Mc Donald, MT are served by a single water utility — the dominant system among the 1 provider tracked in federal data.
Overview
We track water quality and home safety data for 1 ZIP code in Lake Mc Donald, Montana, covering 1 community water system serving approximately 340 people.
No EPA violations recorded across any ZIP codes in Lake Mc Donald — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Lake Mc Donald: D (40/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Lake Mc Donald water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Lake Mc Donald
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 59921 | D | MARTIN CITY COUNTY WATER DISTRICT | 340 |
All ZIP Codes in Lake Mc Donald
- 59921 [D]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
CDC Health Data for Lake Mc Donald
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
What You Can Do in Lake Mc Donald
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Lake Mc Donald, MT