Longmont, CO: 19 Violations - Home Safety 50/100
4 ZIP codes · 8 water systems · Updated
ZipCheckup grade for Longmont: D.
Several federal signals point to home-safety risks in this ZIP.
Public water compliance in Longmont falls below the CO baseline - elevated violation rates are on record.
How Longmont Compares
Data: EPA SDWIS
Longmont Water: The Quick Version
- Your city's water systems recorded 19 violations in the past 5 years.
- Average lead level: 0.0045 mg/L.
- Homes built before 1986: 43% - older plumbing may contain lead solder.
- Estimated remediation: $3,025 per household.
- CDC health risk index: 9.34.
Water Systems Serving Longmont
Residential addresses in Longmont, CO are served by 3 primary water providers out of 8 systems in federal records. Each system maintains separate infrastructure and files its own EPA compliance reports, so service conditions are not uniform across the city.
- D
- F
- F
Overview
We track home safety data for 4 ZIP codes in Longmont, Colorado (population ~141,102), covering 8 community water systems serving approximately 371,815 people region-wide. The EPA snapshots used for this build directly map water systems to 3 of 4 ZIP codes.
3 of 3 ZIP codes 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 Longmont: D (50/100)
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
Longmont water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0045 mg/L (EPA action level: 0.015 mg/L)
- 0 of 3 ZIP codes with known status exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
- Zone 1 (High): 4 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 6 | 3 |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 6 | 3 |
| Stage 1 DBP Rule | Treatment Technique | 6 | 1 |
| E. coli | Microbiological | 5 | 2 |
| Lead and Copper Rule | Treatment Technique | 4 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 80504 | F | 17 | 0 | City of Longmont |
| 80503 | D | 4 | 0 | City of Longmont |
| 80501 | C | 2 | 0 | City of Longmont |
All ZIP Codes in Longmont
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
CDC Health Data for Longmont
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Key Contaminants Detected in Longmont
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Longmont's Housing Stock?
With 43% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Over the decades, Longmont accumulated housing from multiple construction periods. The median build year of 1992 places the midpoint of that stock near the 1986 threshold when lead solder in plumbing became federally prohibited - leaving a sizable share of homes on each side of that safety line.
Most homes in Longmont were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Longmont: Remediation Cost in Perspective
Remediation costs in Longmont are small relative to typical property values - the cost-to-value ratio here is favorable.
Remediation costs in Longmont are relatively low compared to home values. The $2,050–$4,150 estimated range is a small fraction of median property value. Home values are 23% above the Colorado average.
Protecting Children from Lead in Longmont
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Before the federal solder ban, lead solder was a routine plumbing material, and 43% of the Longmont inventory was built in that earlier era - a share large enough to move household-level reads onto the standard list.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical Flood-Claim Evidence for Longmont
Historical NFIP data for Longmont contains 142 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $64,878. Among ZIP codes with claim records, 100% 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 <strong>$3,025</strong> 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 Longmont
- Test your water at home. City-level data shows averages - your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. Filters rated for Total Trihalomethanes (TTHM) can reduce the most common contaminant found in Longmont's water.
- Check your home's plumbing. With 43% of homes built before 1986, lead solder is a real possibility.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Longmont, CO