CITY REPORT MT

Big Sky, MT: 1 Violation - Home Safety 66/100

1 ZIP code · 1 water system · Updated

ZipCheckup grade for Big Sky: C.

A mixed picture - some signals here are worth your attention.

For residents of Big Sky, MT, a C is a prompt to look up the report for their own ZIP code rather than a verdict on their tap.

How Big Sky Compares

Big Sky66/100
Montana avg65/100
National avg73/100

Data: EPA SDWIS

1
ZIP Codes
1
Water Systems
1
ZIPs Linked to Systems with Violations
C · 66
Avg Safety Score
Zone 1
County Radon Potential (High)
$869K
Median Home Value
$500
Est. Remediation (0.1% of home value)

Key Facts for Big Sky Residents

  • Water systems mapped to your city have 1 violation on record since 2021.
  • Average of reported 90th-percentile lead results: 0.0048 mg/L.
  • Homes built before 1986: 27% - older plumbing may contain lead solder.
  • Estimated remediation: $500 per household.
  • Health risk index (ZipCheckup composite of CDC data): 9.21.

Big Sky's Water Providers

Which water system serves a particular address in Big Sky, MT? The water bill or the utility can confirm it; the list here shows one system, and federal data link 1 in total.

Overview

We track home safety data for 1 ZIP code in Big Sky, Montana (population ~1,867), covering 1 community water system serving approximately 4,132 people region-wide. The EPA snapshots used for this build directly map water systems to 1 of 1 ZIP codes.

1 of 1 ZIP code with a reported violation count in the available EPA record (100%) have recorded EPA violations. The available record reports no health-based violations for this measured scope.

Home Safety Score

Average Home Safety Score for Big Sky: C (66/100)

Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:

Factor What It Measures
Water Quality EPA violations and compliance history
PFAS MCL Screen UCMR 5 testing against the covered federal MCLs
Radon Risk EPA radon zone classification
Annual AQI EPA AirData county-year median with at least 90 observed days

Water Sources

Big Sky water systems draw from: Groundwater.

Lead & Copper

  • Average of reported 90th-percentile lead results: 0.0048 mg/L (EPA action level: 0.015 mg/L)
  • 0 of 1 ZIP code with known status exceed the EPA lead action level

Radon Risk

1 of 1 ZIP records with known zones is in EPA Radon Zone 1.

The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.

Top Contaminants

Contaminant Category Violations ZIPs Affected
Nitrate-Nitrite Inorganic 2 1

Areas with Most Violations

ZIP Code Safety Score Violations Health-Based System
59716 C 1 0 Big Sky County Water and Sewer District 363

All ZIP Codes in Big Sky

  • 59716 [C] - 1 violation

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Big Sky Community Health Snapshot

10.7%
Asthma (US: 9.8%)
6.7%
Diabetes (US: 10.4%)
16.7%
Poor Mental Health (US: 14.8%)

Source: CDC PLACES (County-level estimates). County health indicators are shown for context only and are not linked to this area's water records.

Compared to National Average

Asthma 10.7% ↑
Diabetes 6.7% ↓
Mental Health 16.7% ↑

Vertical line = national average. ■ Above national · ■ Below national

What's in Big Sky's Water?

Nitrate-Nitrite 2 violations
Inorganic · EPA regulatory level for the contaminant named above: 10 mg/L

Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.

Big Sky Infrastructure Age

1993
Median Build Year
27%
Built Before 1986
3%
Built Before 1970
Copper
Likely Pipe Material

Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.

Source: U.S. Census Bureau American Community Survey (ACS).

Housing Age Profile

For Big Sky, the median build year stands at 1993; the figures below show the share of homes from each era.

1993
Median Year Built
27%
Pre-1986 (lead solder era; lead paint banned 1978)
3%
Pre-1970 (Lead Pipes Risk)
Pre-1970 (3%) 1970–1986 (24%) Post-1986 (73%)

Most homes in Big Sky were built after 1986; lead exposure at a tap still depends on its service line and plumbing. Older homes should still be tested.

Source: U.S. Census Bureau ACS B25034.

How Remediation Costs Compare in Big Sky

Relative to home values, Big Sky remediation estimates run low.

Median Home Value
$868,600
Est. Remediation
$500
Remediation as % of home value 0.1%

Estimated remediation costs in Big Sky can be compared with local home values. The $300–$800 estimated range can be set against the median property value; actual costs vary by home. Home values are 193% above the Montana average.

Big Sky: Lead Risk & Vulnerable Populations

27%
Homes Built Before 1986
0.0048
mg/L average of reported water-system 90th-percentile lead results (the 0.015 action level applies to each system's result, not to this average)

Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.

Roughly 27% of homes in Big Sky were built before 1986, when federal law restricted lead in new plumbing.

Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.

Big Sky: NFIP Claim Records and Water-Quality Context

1
Total FEMA Flood Claims
$5,343
Avg Reported Sum With Payment Data
0%
A/V Share of Claim-Record ZIPs

Historical NFIP data for Big Sky contains 1 flood insurance claim. Among claims with payment data, the average reported building, contents, and ICC component sum is $5,343. Among ZIP codes with claim records, 0% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.

How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. The $500 remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.

Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.

Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.

What You Can Do in Big Sky

  1. Test your water at home. City-level data shows averages - your tap may differ. Check the certification, price and turnaround time of any water test kit or lab service.
  2. Install a certified water filter. For Nitrate-Nitrite, listed in the water-quality records for Big Sky: if it is a rule or reporting requirement rather than a contaminant, ask your utility what the record involved; for bacteria, follow any boil-water notice from your utility; for a specific chemical contaminant, check whether a filter is certified to reduce it. Not every contaminant has a consumer filter certification.
  3. Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.

Deep Dive Reports

Detailed analysis for Big Sky, MT

Frequently Asked Questions

What does the Home Safety Score mean for Big Sky, MT?
Big Sky has an average Home Safety Score of 66/100 (Grade C) under ZipCheckup model 4.0.0, an area-level model that draws on EPA water compliance records, PFAS screening, EPA radon zones, and annual EPA air quality data; see the methodology page for how inputs and coverage are handled. 1 violation appears in EPA records for water systems mapped to these ZIP codes. Check individual ZIP code reports for component details.
How many violations are on record for water systems serving Big Sky?
EPA records list 1 EPA violation for Big Sky water systems. These water-system violations are shown for 1 mapped ZIP code.
Does Big Sky water have lead?
The average of the reported 90th-percentile lead results across the ZIP codes of Big Sky is 0.0048 mg/L. The EPA action level of 0.015 mg/L applies to each water system's own 90th percentile, not to this average. EPA's health goal for lead is zero. Lead levels can vary by home - testing is recommended especially in older properties.
How does Big Sky compare to Montana average?
Big Sky has an average Home Safety Score of 66/100, which is at or above the Montana state average of 65/100 for the same model series.
How many water systems serve Big Sky?
Our records map 1 water system to 1 ZIP code in Big Sky. The related population figure in our data is approximately 1,867 people; it is not a count of people served citywide.
How much does it cost to fix water issues in Big Sky?
Estimated remediation cost per household in Big Sky: $500; modeled range $300 to $800. Estimated costs may include filtration, pipe replacement, radon mitigation, or flood protection where applicable.
Home → Cities → Montana → Big Sky, MT

How to cite this page

APA ZipCheckup. (2026). Big Sky, MT: 1 Violation - Home Safety 66/100. https://zipcheckup.com/cities/mt/big-sky/
BibTeX 
@misc{zipcheckup-cities-mt-big-sky,
  author = {{ZipCheckup}},
  title  = {{Big Sky, MT: 1 Violation - Home Safety 66/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/cities/mt/big-sky/}
}

Page version: October 2026.

Get safety alerts for Big Sky, Montana

Free updates when EPA data changes for this area. No spam.

Unsubscribe anytime. Privacy Policy.

Share This Page

X Facebook
Violations found - check filter options Free tool - no phone call required.