ZipCheckup grade for 81101: C.

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

Your top priority: match a filter's certification to the violations (19 health-based violations). Check your ZIP → NSF certified filters

Health Violations Found
C 67

Alamosa, CO (81101): 19 Health-Based Violations Recorded for Mapped Water Systems - 67/100

EPA data combined for 3 water systems mapped to this ZIP (largest mapped system: City of Alamosa)

Health Violations Found

Health-based violation records by water system:

EPA records for the water systems mapped to 81101 in Alamosa, CO contain 108 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 19 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 67/100
Water Quality Issues 19 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 18 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 19 health-based violations and 89 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 2 - county-level radon potential, not a home measurement.
  • Flood 18 cumulative NFIP claim records. Claim evidence is historical, not current map coverage.
Contaminant Summary
Health Violations
108 violations 19 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: 67 / 100
Bottom 35% of U.S. ZIP codes
3
Water Systems
11,271
People Served
19
Health Violations (since 2021)Median is 0
Groundwater
Water Source
Zone 2
County Radon Potential · Moderate
$217K
Median Home Value50% below state median ($430K)

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Score Breakdown

Overall Home Safety Score: 67/100

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
0/100
Observed
PFAS MCL screen
100/100
Observed
EPA radon zone
50/100
Observed
Annual EPA AirData AQI
100/100
Observed

Required domains

Drinking water
50/100
Indoor environment
50/100
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 81101 in Alamosa, Colorado is mapped to the water system City of Alamosa (EPA ID: CO0102100). This system provides water to approximately 11,271 people from groundwater sources.

There are 3 community water systems serving this area.

Water Systems Serving This Area

System Name EPA ID Population Source
City of Alamosa CO0102100 11,271 Groundwater
East Alamosa CO0102200 1,453 Groundwater
Valley Mobile Home Llc CO0102300 85 Groundwater

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 Alamosa (CO0102100) on EPA.gov.

4 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 →

Compliance History

2021 5 2022 4 2023 4 2024 3 2025
Health-based (MCL/TT) Other violations

UCMR 5 PFAS monitoring: no reportable detections in available records

Available federal UCMR5 records for water systems mapped to ZIP code 81101 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) OK
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 Alamosa

Based on local data for ZIP 81101, 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 Alamosa has 18 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)

Gutter Installation & Repair

The median home in 81101 was built around 1987. Aging gutters can cause foundation damage, basement flooding, and mold - a professional assessment can prevent costly repairs.

Typical cost: Gutter installation: typically $1,000–$2,500 for a standard home

Estimate Your Home Maintenance Costs

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 81101 safe to drink?

EPA SDWIS records 108 violations since 2021 across the water systems mapped to ZIP 81101 (primary system: City of Alamosa), including 19 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 81101's water come from?

The recorded water source for City of Alamosa, a system mapped to ZIP code 81101, is Groundwater. This system serves approximately 11,271 people.

How does Alamosa water compare to the national average?

Alamosa's Home Safety Score ranks lower than 65% of U.S. ZIP codes, and at or above 85% within Colorado.

How can I get my water tested in Alamosa?

If City of Alamosa 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 81101?

81101 is mapped to a county in EPA Radon Zone 2 (moderate county-level radon potential; EPA recommends testing every home), located in Alamosa 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 81101?

FEMA records contain 18 flood insurance claims filed in ZIP code 81101; the recorded rated-zone value (the most frequent one if there are several claims) is AO, 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). Alamosa, CO (81101): 19 Health-Based Violations Recorded for Mapped Water Systems - 67/100. https://zipcheckup.com/report/81101/
BibTeX 
@misc{zipcheckup-report-81101,
  author = {{ZipCheckup}},
  title  = {{Alamosa, CO (81101): 19 Health-Based Violations Recorded for Mapped Water Systems - 67/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/report/81101/}
}

Page version: October 2026.

Nearby ZIP Code Reports

Water quality comparison for ZIP codes near 81101

ZIP Code City, State Distance Grade Violations
81102 Alamosa, CO <1 mi N/A 0
81146 Mosca, CO 12.1 mi N/A 0
81135 Homelake, CO 14.0 mi N/A 0
81140 La Jara, CO 14.2 mi N/A 0
81151 Sanford, CO 14.7 mi N/A 0
81144 Monte Vista, CO 16.0 mi N/A 0
81136 Hooper, CO 17.5 mi N/A 0
81124 Capulin, CO 18.1 mi N/A 0
81123 Blanca, CO 20.0 mi N/A 0
81141 Manassa, CO 20.5 mi N/A 0

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