ZipCheckup grade for 80027: C.

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

Your top priority: test this home for radon. Check your ZIP → EPA radon map

Health Violations Found
C 60

Louisville, CO (80027): 4 Health-Based Violations Recorded for Mapped Water Systems - 60/100

EPA data combined for 9 water systems mapped to this ZIP (largest mapped system: City of Louisville)

Health Violations Found High County Radon Potential

Health-based violation records by water system:

EPA records for the water systems mapped to 80027 in Louisville, CO contain 16 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 4 are marked health-based.

Data source: U.S. Environmental Protection Agency (EPA) SDWIS

Based on EPA Drinking Water FEMA Flood Data U.S. Census CDC Energy Information Admin. USGS Water Data & 9 more federal sources
Latest air quality, EPA records and weather alerts Current data temporarily unavailable
Current EPA violation data unavailable
Water records and current conditions
Current EPA violation data unavailable
Safety Score
C 60/100
Water Quality Issues 4 health-based violation records
Lead Risk Below action level Below the reporting limit, 90th percentile, sample period ending 2025-12-31
NFIP Claim History Claim records 10 claims
Data confidence: High (direct measurement) Medium (sampled / sub-geography) Low (modeled / inferred) Methodology →

At a Glance

  • Water EPA records for water systems mapped to this ZIP show 4 health-based violations and 12 non-health-based (since 2021).
  • Lead The reported 90th-percentile lead result is below the laboratory reporting limit, not a measured zero; EPA's health goal for lead is zero.
  • Radon EPA Zone 1 - highest county-level potential. This is not a home measurement; test before any threshold comparison.
  • Flood 10 cumulative NFIP claim records. Claim evidence is historical, not current map coverage.
Contaminant Summary
Health Violations
16 violations 4 health-based
Report data assembled: Jul 27, 2026 EPA water-system identity: source date or period is not present in ZipCheckup's accepted source record EPA violation history: more than two update cycles old Lead, copper and UCMR measurements: source date or period is not present in ZipCheckup's accepted source record
C
ZIP-level Home Safety model score: 60 / 100
Bottom 19% of U.S. ZIP codes
9
Water Systems
20,975
People Served
4
Health Violations (since 2021)Median is 0
Surface water
Water Source
Zone 1
County Radon Potential · High
$823K
Median Home Value91% above state median ($430K)

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Score Breakdown

Overall Home Safety Score: 60/100

This is the published model score. Component and domain values are shown independently; they are not added together on this page.

Canonical components

EPA water compliance
60/100
Observed
PFAS MCL screen
100/100
Observed
EPA radon zone
0/100
Observed
Annual EPA AirData AQI
100/100
Observed

Required domains

Drinking water
80/100
Indoor environment
0/100
Outdoor environment
100/100

Coverage: 4 of 4 components and 3 of 3 domains observed.

Model 4.0.0; series home-safety-v4-cross-vertical.

Safety & Health (6) CRITICAL

Your Water System

ZIP code 80027 in Louisville, Colorado is mapped to the water system City of Louisville (EPA ID: CO0107487). This system provides water to approximately 20,975 people from surface water sources.

There are 9 community water systems serving this area.

Water Systems Serving This Area

System Name EPA ID Population Source
City of Louisville CO0107487 20,975 Surface water
Superior Md No 1 CO0107725 17,900 Surface water
City of Lafayette CO0107473 28,700 Surface water
Shannon Water Supply District CO0107710 450 Groundwater
Baseline Water District CO0107135 820 Surface water

Other Water Quality Reports in Colorado

Nearby Water Quality Reports

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for City of Louisville (CO0107487) on EPA.gov.

5 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.

📊 EPA Safe Drinking Water · View source →

UCMR 5 PFAS monitoring: no reportable detections in available records

Available federal UCMR5 records for water systems mapped to ZIP code 80027 show no PFAS detections among the compounds tested, at the program's reporting levels.

The EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR5) required community and non-transient non-community water systems serving 3,300 or more people to test for 29 PFAS compounds and lithium between 2023 and 2025. Systems with no detections at the federal minimum reporting level had no results at or above that reporting level.

📊 EPA UCMR5 · View source →
Environmental Hazards (11) MODERATE
Home & Infrastructure (6) OK
Cost & Community (9) HIGH

CPSC product recall notices

These national notices are not matched to this ZIP code or water system.

View all recalls →

📊 CPSC · View source →

Protect Your Home in Louisville

Based on local data for ZIP 80027, these services may benefit homeowners in your area.

Based on local data for your area. Use the tools below to explore your options.

Home & Flood Insurance

The ZIP code for this report in Louisville has 10 FEMA flood claims on record. Standard homeowner policies don't cover flood damage - make sure you're protected.

Typical cost: Flood insurance: premiums vary by property and flood zone; request a quote

Check Your Flood Zone (Free)

FEMA flood map lookup - see if your property is in a flood zone

Free tip: Check your FEMA flood zone at msc.fema.gov (free lookup)

Roofing Inspection & Repair

Active weather alerts in Colorado increase the risk of roof damage from hail and high winds. A professional inspection can identify vulnerabilities.

Typical cost: Roof inspection: typically $75–$300; repairs $300–$1,500

Estimate Your Home Insurance Needs

Service recommendations are based on public data for this ZIP code (FEMA, Census ACS, NWS). Actual needs vary by property. By calling, your information will be shared with an independent service provider. ZipCheckup may receive compensation. Cost estimates are approximate and vary by property, condition, and contractor.

Frequently Asked Questions

Is the tap water in 80027 safe to drink?

EPA SDWIS records 16 violations since 2021 across the water systems mapped to ZIP 80027 (primary system: City of Louisville), including 4 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.

Where does 80027's water come from?

The recorded water source for City of Louisville, a system mapped to ZIP code 80027, is Surface water. This system serves approximately 20,975 people.

How does Louisville water compare to the national average?

Louisville's Home Safety Score ranks lower than 81% of U.S. ZIP codes, and lower than 60% of ZIP codes within Colorado.

How can I get my water tested in Louisville?

If City of Louisville supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.

What is the radon risk for 80027?

80027 is mapped to a county in EPA Radon Zone 1 (high county-level radon potential; EPA recommends testing every home), located in Boulder County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.

What does the NFIP claim history show for ZIP 80027?

FEMA records contain 10 flood insurance claims filed in ZIP code 80027; the recorded rated-zone value (the most frequent one if there are several claims) is AE, which is claims evidence and may differ from the current FEMA map zone for a property. Claim records do not establish current property risk. Review FEMA's map for the specific property.

How to cite this page

APA ZipCheckup. (2026). Louisville, CO (80027): 4 Health-Based Violations Recorded for Mapped Water Systems - 60/100. https://zipcheckup.com/report/80027/
BibTeX 
@misc{zipcheckup-report-80027,
  author = {{ZipCheckup}},
  title  = {{Louisville, CO (80027): 4 Health-Based Violations Recorded for Mapped Water Systems - 60/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/report/80027/}
}

Page version: October 2026.

Nearby ZIP Code Reports

Water quality comparison for ZIP codes near 80027

ZIP Code City, State Distance Grade Violations
80028 Louisville, CO 2.0 mi N/A 0
80026 Lafayette, CO 2.9 mi D 24
80303 Boulder, CO 5.0 mi C 17
80038 Broomfield, CO 5.1 mi N/A 0
80305 Boulder, CO 5.7 mi C 19
80020 Broomfield, CO 5.9 mi N/A 14
80301 Boulder, CO 6.1 mi D 82
80321 Boulder, CO 6.2 mi N/A 0
80322 Boulder, CO 6.2 mi N/A 0
80323 Boulder, CO 6.2 mi N/A 0

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