Lewis and Clark County, Montana
15 ZIP codes · Avg score 51/100 · Grade D
ZipCheckup grade for Lewis and Clark County: D.
Federal records show several conditions worth reviewing.
The D-F rating for Lewis and Clark County calls for a closer look, not alarm, and each of its 15 ZIP codes has its own report.
How Lewis and Clark County Compares
How Lewis and Clark County Compares
Lewis and Clark County scores 14 points below the Montana state average (65/100) and 22 points below the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData
ZIP Code Risk Map
Water Quality Map: Lewis and Clark County, Montana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.8 (asthma 11.2%, diabetes 9.3%)
Modeled additional annual cost estimate per homeowner: $623, largest modeled factor: Flood
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINSA infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $623
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Lewis and Clark County
Modeled remediation costs in Lewis and Clark County can be compared with the median property value; actual costs vary by property.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Lewis and Clark County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Lewis and Clark County ZIP codes
8 community water systems mapped to Lewis and Clark County ZIP codes; EPA may list more systems serving the county.
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Show all 8 water systems
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10 water systems mapped to Lewis and Clark County ZIP codes in our data; EPA may list more systems serving the county.
Systems with the most violations in Lewis and Clark County
5 water systems with violations in EPA records.
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All ZIP Codes in Lewis and Clark County
15 ZIP codes tracked in Lewis and Clark County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 59601 | Helena | 51 | D | 41 (4 health) | $355K |
| 2 | 59602 | Helena | 50 | D | 133 (5 health) | $370K |
| 3 | 59410 | Augusta | — | — | $228K | |
| 4 | 59604 | Helena | — | — | — | |
| 5 | 59620 | Helena | — | — | — | |
| 6 | 59623 | Helena | — | — | — | |
| 7 | 59624 | Helena | — | — | — | |
| 8 | 59625 | Helena | — | — | 3 (3 health) | — |
| 9 | 59626 | Helena | — | — | — | |
| 10 | 59633 | Canyon Creek | — | — | $410K | |
| 11 | 59635 | East Helena | — | — | 7 (4 health) | $356K |
| 12 | 59636 | Fort Harrison | — | — | — | |
| 13 | 59639 | Lincoln | — | — | $294K | |
| 14 | 59640 | Marysville | — | — | $275K | |
| 15 | 59648 | Wolf Creek | — | — | $321K |
Recommended Buyer Guides for Lewis and Clark County
Each guide below is listed with the reason it appears.
- Water Filters Certified for PFAS Reduction — PFAS detected in 1 ZIP code
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Lewis and Clark County, Montana
Overview
Lewis and Clark County in Montana covers 15 tracked ZIP records with an average Home Safety Score of D (51/100) across 2 scored records.
4 of 4 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 5 health-based violations appear in the available health breakdown.
← Back to Montana Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
What You Can Do
Lewis and Clark County has an average Home Safety grade of D across its scored ZIP records. Here are steps to protect your household.
Test your tap water
Ask a certified laboratory which tests it offers for lead, bacteria, and other contaminants relevant to your home; a $20-$50 kit may cover only certain contaminants.
Consider a certified water filter
NSF/ANSI-certified filters reduce the specific contaminants listed on their certification. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It reports monitored contaminants detected in the utility's water and related compliance information.