Community Water System · PWS CO0149122
Aspen City Of
Operator location Aspen, Colorado - larger served population (> 3,309) at 31,100 people served; 215 SDWIS violations on record from surface water sources.
- 31,100
- People served (this PWS) Larger third of systems
- 215
- EPA violations (this PWS) Upper third of systems
- 3
- Health-based (this PWS) Middle third by health-based share
- No PFAS
- UCMR5 (this PWS) Tested, none detected
Aspen City Of standing, high SDWIS violation third
31,100 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 1% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #1,792 of 29,740 among systems serving 500+.
The verdict
Aspen City Of sits in the upper third of the sitemap cohort by violation count (215), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (31,100; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 1% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #1,792 of 29,740
- Population · /systems
- #36 of 551
- Population · CO
- 215
- Total EPA violations on record
- 1%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 3,875
- County
- Pitkin
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 209
- Treatment Tech Violations
- 3
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | MR | 15 | 2025 |
| CARBON, TOTAL | MR | 7 | 2025 |
| Nitrate | MR | 6 | 2013 |
| Interim Enhanced Surface Water Treatment Rule | MR | 6 | 2022 |
| Revised Total Coliform Rule | MON | 6 | 2025 |
| 1,2-Dichloroethane | MR | 4 | 2010 |
| 1,1,1-Trichloroethane | MR | 4 | 2010 |
| Carbon tetrachloride | MR | 4 | 2010 |
| Trichloroethylene | MR | 4 | 2010 |
| Benzene | MR | 4 | 2010 |
| 1,1-Dichloroethylene | MR | 4 | 2010 |
| p-Dichlorobenzene | MR | 4 | 2010 |
| 1,2,4-Trichlorobenzene | MR | 3 | 2010 |
| cis-1,2-Dichloroethylene | MR | 3 | 2010 |
| trans-1,2-Dichloroethylene | MR | 3 | 2010 |
| 1,2-Dichloropropane | MR | 3 | 2010 |
| CHLOROBENZENE | MR | 3 | 2010 |
| Toluene | MR | 3 | 2010 |
| Ethylbenzene | MR | 3 | 2010 |
| Styrene | MR | 3 | 2010 |
| Endrin | MR | 3 | 2008 |
| BHC-GAMMA | MR | 3 | 2008 |
| Toxaphene | MR | 3 | 2008 |
| Diquat | MR | 3 | 2008 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2008 |
| OXAMYL | MR | 3 | 2008 |
| Simazine | MR | 3 | 2008 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2008 |
| Dinoseb | MR | 3 | 2008 |
| Hexachlorocyclopentadiene | MR | 3 | 2008 |
Violation Count vs. the National Corpus
Aspen City Of has 215 recorded EPA violations, 86% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 14% carry more. 1% of this system's own violations are health-based (3 of 215), and it ranks #1,792 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
215 Higher than most more violations than 86% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
How many violations vs. how serious, among peer systems
Aspen City Of plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NEtFOSAA | 7/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 7/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 7/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 7/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 7/9/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 7/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 7/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 7/9/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| 8:2 FTS | 7/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 7/9/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFHpA | 7/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 7/9/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFUnA | 7/9/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFBS | 7/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 7/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 7/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 7/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 7/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 7/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 7/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 7/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/9/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 7/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 7/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 7/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 7/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDoA | 7/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 4/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 4/9/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 4/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 4/9/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 4/9/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| NFDHA | 4/9/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeA | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 4/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 4/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 4/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 4/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 4/9/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 4/9/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOS | 4/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 4/9/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
Population served record for Aspen City Of
EPA SDWIS lists 31,100 people served and 3,875 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Colorado Department of Public Health and Environment, Water Quality Control
Nationwide peers
215 violations · 31,100 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Aspen City Of
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Colorado compares on the same EPA violation measures. Colorado systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.