Community Water System · PWS WY5600067
Bar Nunn, Town Of
Operator location Bar Nunn, Wyoming - larger served population (> 3,309) at 4,000 people served; 16 SDWIS violations on record from surface water sources.
- 4,000
- People served (this PWS)
- 16
- EPA violations (this PWS)
- 2
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Bar Nunn, Town Of standing, low SDWIS violation third
4,000 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 13% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #8,884 of 29,740 among systems serving 500+.
The verdict
Bar Nunn, Town Of is in the lower third by violation count (16; lower-third violation load (≤ 21 violations)). A low count does not mean the system is unmonitored - monitoring and reporting violations still appear in SDWIS. Population served is large (4,000; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 13% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #8,884 of 29,740
- Population · /systems
- #27 of 147
- Population · WY
- 16
- Total EPA violations on record
- 13%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,710
- County
- Natrona
- School/Daycare
- No
- MCL Violations
- 2
- Monitoring Violations
- 14
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 4 | 2011 |
| Coliform (TCR) | MCL | 2 | 2012 |
| Mercury | MR | 1 | 1982 |
| Fluoride | MR | 1 | 1982 |
| Barium | MR | 1 | 1982 |
| Arsenic | MR | 1 | 1982 |
| Combined Radium (-226 and -228) | MR | 1 | 1976 |
| Cadmium | MR | 1 | 1982 |
| Nitrate | MR | 1 | 1982 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1976 |
| Selenium | MR | 1 | 1982 |
| Chromium | MR | 1 | 1982 |
Violation Count vs. the National Corpus
Bar Nunn, Town Of has 16 recorded EPA violations, 26% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 72% carry more. 13% of this system's own violations are health-based (2 of 16), and it ranks #8,884 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)
16 Lower than most fewer violations than 72% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 62 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NMeFOSAA | 9/23/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 9/23/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 9/23/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 9/23/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 6/16/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NMeFOSAA | 6/16/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTA | 6/16/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| NEtFOSAA | 6/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NFDHA | 5/6/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| ADONA | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 5/6/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 5/6/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 5/6/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 5/6/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 9Cl-PF3ONS | 5/6/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| HFPO-DA | 5/6/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 5/6/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 5/6/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 5/6/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 5/6/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 5/6/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 5/6/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 5/6/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 3/17/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 3/17/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 3/17/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 3/17/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFPeS | 10/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 6:2 FTS | 10/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 10/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 10/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 10/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 10/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 10/8/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFDoA | 10/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 10/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 10/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 10/8/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 10/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 10/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
Population served record for Bar Nunn, Town Of
EPA SDWIS lists 4,000 people served and 1,710 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
16 violations · 4,000 served: nearest cross-state SDWIS matches.
Cross-state systems with similarly light violation ledgers
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 Bar Nunn, Town Of
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Wyoming compares on the same EPA violation measures. Wyoming 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.