ZipCheckup grade for 80121: C.

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

Your top priority: have older plumbing checked for lead solder. Check your ZIP → EPA: reduce lead

Health Violations Found
C 64

Littleton, CO (80121): 1 Health-Based Violation Recorded for Mapped Water Systems - 64/100

EPA data combined for 3 water systems mapped to this ZIP (largest mapped system: Southgate Water Supply District)

Health Violations Found PFAS Detected High County Radon Potential

Health-based violation records by water system:

EPA records for the water systems mapped to 80121 in Littleton, CO contain 6 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 1 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 64/100
Water Quality Issues 1 health-based violation
Lead Risk Moderate 0.009 mg/L, 90th percentile, sample period ending 2002-12-31
NFIP Claim History Claim records 7 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 1 health-based violation and 5 non-health-based (since 2021).
  • Lead The reported 90th-percentile lead result of 0.009 mg/L is below the EPA action level, but EPA's health goal for lead is zero; filtration is advisable.
  • PFAS PFAS detected in UCMR5 sampling; see the PFAS section for each compound, compared with the federal PFAS MCL where one exists.
  • Radon EPA Zone 1 - highest county-level potential. This is not a home measurement; test before any threshold comparison.
  • Flood 7 cumulative NFIP claim records. Claim evidence is historical, not current map coverage.
Contaminant Summary
Health Violations
6 violations 1 health-based PFAS detected
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: 64 / 100
Bottom 23% of U.S. ZIP codes
3
Water Systems
55,000
People Served
1
Health Violations (since 2021)Median is 0
Surface water
Water Source
0.009 mg/L
Reported Lead Result3.9× the national median for this measure
Zone 1
County Radon Potential · High
$685K
Median Home Value59% above state median ($430K)

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Score Breakdown

Overall Home Safety Score: 64/100

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
86/100
Observed
PFAS MCL screen
100/100
Observed
EPA radon zone
0/100
Observed
Annual EPA AirData AQI
100/100
Observed

Required domains

Drinking water
93/100
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 (7) CRITICAL

Your Water System

ZIP code 80121 in Littleton, Colorado is mapped to the water system Southgate Water Supply District (EPA ID: CO0103721). This system provides water to approximately 55,000 people from surface water sources.

There are 3 community water systems serving this area.

Water Systems Serving This Area

System Name EPA ID Population Source
Southgate Water Supply District CO0103721 55,000 Surface water
Willows Water District CO0103100 19,000 Surface water
City of Englewood CO0103045 57,332 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 Southgate Water Supply District (CO0103721) 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 →

PFAS Contamination Detected

PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 80121.

Detected compounds: PFBA, PFPeA, PFBS, PFHxA, PFOA.

Highest measured level: 0.0064 µg/L

Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.

📊 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 Littleton

Based on local data for ZIP 80121, 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 Littleton has 7 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 80121 was built around 1977. 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

Window Replacement

The median build year of homes in Littleton is 1977; check the age and condition of your own windows. ENERGY STAR windows can save $101–$583/year on energy bills.

Typical cost: Window replacement: typically $300–$800 per window installed

Estimate Your Home Maintenance Costs

Roofing Inspection & Repair

Homes built around 1977 may be on their second or third roof. A professional inspection can catch damage before leaks start.

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 80121 safe to drink?

EPA SDWIS records 6 violations since 2021 across the water systems mapped to ZIP 80121 (primary system: Southgate Water Supply District), including 1 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 80121's water come from?

The recorded water source for Southgate Water Supply District, a system mapped to ZIP code 80121, is Surface water. This system serves approximately 55,000 people.

How does Littleton water compare to the national average?

Littleton's Home Safety Score ranks lower than 77% of U.S. ZIP codes, and at or above 50% within Colorado.

How can I get my water tested in Littleton?

If Southgate Water Supply District 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.

Is lead a concern in 80121 tap water?

The Lead and Copper Rule record selected for 80121 reports a 90th-percentile lead result of 0.009 mg/L for a water system mapped to this ZIP (record date 2002-12-31). The EPA action level is 0.015 mg/L. This result is below the EPA action level; it does not show the lead level in each home.

What is the radon risk for 80121?

80121 is mapped to a county in EPA Radon Zone 1 (high county-level radon potential; EPA recommends testing every home), located in Arapahoe County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.

Are there PFAS (forever chemicals) in 80121's water?

Yes, PFAS have been detected in samples from water systems mapped to 80121. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.

What does the NFIP claim history show for ZIP 80121?

FEMA records contain 7 flood insurance claims filed in ZIP code 80121; the recorded rated-zone value (the most frequent one if there are several claims) is X, 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). Littleton, CO (80121): 1 Health-Based Violation Recorded for Mapped Water Systems - 64/100. https://zipcheckup.com/report/80121/
BibTeX 
@misc{zipcheckup-report-80121,
  author = {{ZipCheckup}},
  title  = {{Littleton, CO (80121): 1 Health-Based Violation Recorded for Mapped Water Systems - 64/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/report/80121/}
}

Page version: October 2026.

Nearby ZIP Code Reports

Water quality comparison for ZIP codes near 80121

ZIP Code City, State Distance Grade Violations
80122 Littleton, CO 2.1 mi C 0
80113 Englewood, CO 2.1 mi C 6
80120 Littleton, CO 2.8 mi C 6
80150 Englewood, CO 3.1 mi N/A 0
80151 Englewood, CO 3.1 mi N/A 0
80155 Englewood, CO 3.1 mi N/A 0
80160 Littleton, CO 3.4 mi N/A 0
80161 Littleton, CO 3.4 mi N/A 0
80165 Littleton, CO 3.4 mi N/A 0
80166 Littleton, CO 3.4 mi N/A 0

Contaminants Detected in 80121

Learn more about the contaminants found in your water supply:

Overall safety breakdown

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Coverage: 14/17 risk factors Data sources →
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