STATE REPORT CO 272 HEALTH VIOLATIONS

Colorado Home Safety Profiles by ZIP

658 ZIP codes · 283 water systems · IPC plumbing code · Updated

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData, NWS, State plumbing boards, Rewiring America

ZipCheckup tracks drinking-water and home-safety data for 658 ZIP codes across Colorado, covering 283 public water systems that serve about 5,773,714 people. 262 ZIP codes carry at least one EPA violation on record.

658
ZIP Codes
283
Water Systems
262
ZIPs with Violations
IPC
Plumbing Code
4
Avg Rebate Programs
C · 59
Avg Safety Score
91%
High Radon Risk (Zone 1)
#49
of 50 States
1%
ZIPs Rated A or B
85%
ZIPs with Violations
C
Colorado average: 59/100 - ranked #49 of 50 states. 14 points below the national average (73). 85% of ZIP codes have recorded violations.

If statewide compliance data is your starting point, Colorado shows a below-average baseline - EPA monitoring records across utility districts document health-based violations in a significant share of the state's water systems, and the aggregate grade has held below the national median across recent tracking cycles.

Score Distribution

How Colorado's 658 ZIP codes are distributed across safety grades.

0
A
2
B
153
C
55
D
11
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

Model 4.0.0 inputs: EPA SDWIS, UCMR5 PFAS, EPA radon zones, annual county AQI •

Top 10 Safest ZIP Codes in Colorado

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 81147 Pagosa SpringsArchuleta 82 B
2 81639 HaydenRoutt 81 B
3 80010 AuroraArapahoe 67 C
4 80011 AuroraAdams 67 C
5 80017 AuroraArapahoe 67 C
6 80022 Commerce CityAdams 67 C
7 80024 DupontAdams 67 C
8 80045 AuroraAdams 67 C
9 80102 BennettAdams 67 C
10 80122 LittletonArapahoe 67 C

10 Lowest-Scoring ZIP Codes in Colorado

#ZIP CodeCityCountyScoreGradeViolations
1 80550 WindsorWeld 31 F 28
2 81435 TellurideSan Miguel 33 F 172
3 80817 FountainEl Paso 33 F 84
4 80537 LovelandLarimer 33 F 71
5 80260 DenverAdams 33 F 42
6 80651 PlattevilleWeld 34 F 20
7 80534 JohnstownWeld 35 F 20
8 80504 LongmontWeld 35 F 17
9 80543 MillikenWeld 36 F 17
10 80538 LovelandLarimer 38 F 35

County Rankings

Water quality breakdown by county. 64 counties with data in Colorado.

Loading county map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

County-level aggregation of measured ZIP Home Safety Scores • EPA SDWIS, UCMR 5 PFAS, EPA radon zones, EPA AirData

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
08059 62 C 34 80128 (67) 80465 (50)
08005 61 C 30 80010 (67) 80016 (39)
08001 55 C 25 80011 (67) 80260 (33)
08014 N/A N/A 3 N/A N/A
08013 59 C 31 80302 (66) 80503 (49)
08039 N/A N/A 8 N/A N/A
08035 56 C 15 80126 (67) 80134 (41)
08041 58 C 65 80809 (67) 80817 (33)
08031 65 C 55 80202 (66) 80236 (63)
08093 N/A N/A 10 N/A N/A
08047 N/A N/A 3 N/A N/A
08037 N/A N/A 12 N/A N/A
08117 N/A N/A 5 N/A N/A
08107 74 B 9 81639 (81) 80487 (67)
08065 N/A N/A 3 N/A N/A
08057 N/A N/A 4 N/A N/A
08019 65 C 5 80452 (65) 80452 (65)
08049 66 C 8 80446 (66) 80482 (66)
08123 48 D 40 80624 (58) 80550 (31)
08069 53 D 24 80512 (62) 80537 (33)
08087 N/A N/A 8 N/A N/A
08121 N/A N/A 6 N/A N/A
08095 N/A N/A 4 N/A N/A
08075 N/A N/A 8 N/A N/A
08125 N/A N/A 7 N/A N/A
08115 N/A N/A 3 N/A N/A
08017 N/A N/A 4 N/A N/A
08073 N/A N/A 7 N/A N/A
08063 N/A N/A 6 N/A N/A
08119 N/A N/A 6 N/A N/A
08101 58 C 17 81022 (67) 81004 (50)
08071 N/A N/A 9 N/A N/A
08061 N/A N/A 4 N/A N/A
08009 N/A N/A 6 N/A N/A
08089 N/A N/A 6 N/A N/A
08025 N/A N/A 5 N/A N/A
08011 N/A N/A 4 N/A N/A
08027 N/A N/A 3 N/A N/A
08099 67 C 5 81052 (67) 81052 (67)
08055 N/A N/A 2 N/A N/A
08003 67 C 4 81101 (67) 81101 (67)
08021 N/A N/A 6 N/A N/A
08007 82 B 4 81147 (82) 81147 (82)
08067 64 C 7 81301 (64) 81303 (64)
08023 N/A N/A 7 N/A N/A
08105 N/A N/A 5 N/A N/A
08079 N/A N/A 1 N/A N/A
08109 N/A N/A 5 N/A N/A
08015 65 C 6 81211 (67) 81201 (63)
08051 50 D 12 81230 (50) 81230 (50)
08043 57 C 11 81212 (59) 81226 (55)
08053 N/A N/A 1 N/A N/A
08033 N/A N/A 3 N/A N/A
08083 66 C 8 81321 (67) 81328 (65)
08113 33 F 5 81435 (33) 81435 (33)
08085 N/A N/A 9 N/A N/A
08029 61 C 9 81416 (66) 81419 (55)
08091 N/A N/A 2 N/A N/A
08111 N/A N/A 1 N/A N/A
08077 65 C 19 81501 (66) 81526 (58)
08045 61 C 8 81601 (63) 81623 (58)
08081 N/A N/A 7 N/A N/A
08097 62 C 7 81621 (67) 81611 (58)
08103 N/A N/A 2 N/A N/A

Most Common Contaminants in Colorado

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Fecal Coliform Microbiological 163 463 Yes
E. coli Microbiological 148 549 Yes
Stage 1 DBP Rule Treatment Technique 113 295 Yes
Haloacetic Acids (HAA5) Disinfection Byproducts 110 295 Yes
Total Trihalomethanes (TTHM) Disinfection Byproducts 102 315 Yes
Consumer Confidence Report Rule Reporting 102 209 Yes
Lead and Copper Rule Treatment Technique 99 472 No
Surface Water Treatment Rule Treatment Technique 92 140 No

Overview

We track multi-source home safety signals for 658 ZIP records across Colorado. Home Safety Score model 4.0.0 is published for 221 scored records; missing required evidence suppresses the score.

The EPA snapshots used for this build directly map water systems to 307 ZIP records, covering 283 community water systems that serve approximately 5,773,714 people.

262 of 307 ZIP codes with a reported violation count in the available EPA record (85%) have recorded EPA violations. 272 health-based violations appear in the available health breakdown.

Plumbing Regulations

Colorado follows the International Plumbing Code (2021 edition).

  • Plumbing code: IPC (2021)
  • Homeowner DIY: Allowed with permit
  • Water heater permit: Required
  • Annual backflow test: Required

Full Colorado regulations →

Energy & Water Rebates

Across 633 tracked ZIP codes in Colorado, residents have access to an average of 4 water-related rebate programs - including incentives for heat pump water heaters, efficient fixtures, and plumbing upgrades.

Check rebates for your ZIP code →

Areas with Most Violations

ZIP Code City Home Safety Grade Violations Health-Based System
80906 Colorado Springs D 180 18 Colorado Springs Utilities
81435 Telluride F 172 10 Telluride Town of
80816 Florissant — 141 9 Highland Lakes Water District
81426 Ophir — 134 0 Mountain Village Town of
80439 Evergreen D 113 25 Brook Forest Water District
81101 Alamosa C 108 19 City of Alamosa
80461 Leadville — 106 0 Parkville Water District
80517 Estes Park D 99 32 Estes Park Town of
80817 Fountain F 84 2 City of Fountain
80908 Colorado Springs D 83 0 Colorado Springs Utilities

Areas with No Violations

ZIP Code City Home Safety Grade System Population
80010 Aurora C City of Aurora 533,407
80011 Aurora C City of Aurora 533,407
80017 Aurora C City of Aurora 533,407
80022 Commerce City C South Adams County Water Supply District 75,559
80024 Dupont C South Adams County Water Supply District 75,559
80045 Aurora C City of Aurora 533,407
80102 Bennett C City of Aurora 533,407
80117 Kiowa — Elizabeth Town of 4,523
80122 Littleton C Willows Water District 19,000
80126 Littleton C Highlands Ranch Water Supply District 103,444

Home Safety Score

Average Home Safety Score for Colorado: C (59/100) across 221 scored of 658 tracked ZIP records.

Model 4.0.0 uses the canonical components water-compliance, pfas-mcl-screen, radon-zone, annual-aqi across 3 required domains. The sections below provide additional context and do not change that score. Missing required evidence suppresses the score, and a favorable result is not a property-level safety certification.

Lead & Copper

  • Average lead level (90th percentile): 0.0039 mg/L (EPA action level: 0.015 mg/L)
  • 0 of 298 ZIP codes with known status exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 602 ZIP codes (91%)
  • Moderate risk (Zone 2): 56 ZIP codes
  • Low risk (Zone 3): 0 ZIP codes

ZIP Code Reports for Colorado

Largest Communities

ZIP Code City Population Safety Grade Violations
80231 Denver 1,851,622 C 34
80247 Denver 1,842,407 C 34
80014 Aurora 1,829,622 C 34
80012 Aurora 1,820,407 C 34
80019 Aurora 1,820,407 C 34
80220 Denver 1,820,407 C 34
80230 Denver 1,820,407 C 34
80238 Denver 1,820,407 C 34
80239 Denver 1,820,407 C 34
80249 Denver 1,820,407 C 34
80221 Denver 1,757,299 D 46
80216 Denver 1,629,780 C 43
80226 Denver 1,464,630 C 35
80123 Littleton 1,425,364 C 40
80227 Denver 1,424,880 C 35
80232 Denver 1,420,380 C 35
80214 Denver 1,402,180 C 34
80110 Englewood 1,344,332 C 40
80210 Denver 1,344,332 C 40
80219 Denver 1,344,332 C 40

Lowest Published Home Safety Scores

ZIP Code City Score Grade Violations
80550 Windsor 31 F 28
80260 Denver 33 F 42
80537 Loveland 33 F 71
80817 Fountain 33 F 84
81435 Telluride 33 F 172

Highest Published Home Safety Scores

ZIP Code City Score Grade Violations
81147 Pagosa Springs 82 B 5
81639 Hayden 81 B 7
80010 Aurora 67 C 0
80011 Aurora 67 C 0
80017 Aurora 67 C 0

All 658 ZIP Codes in Colorado

Data Sources

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

Largest water systems in Colorado

The 12 biggest community water systems serving Colorado, of 283 total.

Show all 12 water systems

Systems with the most violations in Colorado

12 systems in Colorado with the most recorded EPA violations.

Frequently Asked Questions

Is the water safe to drink in Colorado?

Colorado has 283 community water systems serving 5,773,714 people across 658 ZIP codes. There are 2,347 recorded violations, including 272 health-based. 262 of 658 ZIP codes have at least one violation.

What plumbing code does Colorado follow?

Colorado follows the IPC plumbing code. DIY plumbing work is allowed for homeowners.

What is the radon risk in Colorado?

91% of ZIP codes in Colorado fall in EPA Radon Zone 1 (highest risk).

How to cite this page

APA ZipCheckup. (2026). Colorado Home Safety Profiles by ZIP. https://zipcheckup.com/states/colorado/
BibTeX 
@misc{zipcheckup-states-colorado,
  author = {{ZipCheckup}},
  title  = {{Colorado Home Safety Profiles by ZIP}},
  year   = {2026},
  url    = {https://zipcheckup.com/states/colorado/}
}

Page version: August 2026.

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