Community Water System · PWS ID4200054
Mountain Home Air Force Base
Operator location Mountain Home Afb, Idaho - larger served population (> 3,309) at 7,500 people served; 574 SDWIS violations on record from groundwater sources.
- 7,500
- People served (this PWS)
- 574
- EPA violations (this PWS)
- 74
- Health-based (this PWS)
- 4 PFAS
- UCMR5 (this PWS)
Mountain Home Air Force Base standing, high SDWIS violation third
7,500 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: middle-third PFAS panel (≤ 4 compounds). Population rank #5,882 of 29,740 among systems serving 500+.
The verdict
Mountain Home Air Force Base sits in the upper third of the sitemap cohort by violation count (574), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (7,500; 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 detected 4 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #5,882 of 29,740
- Population · /systems
- #35 of 249
- Population · ID
- 574
- 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.
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Federal
- Connections
- 1,053
- County
- Elmore
- School/Daycare
- No
- MCL Violations
- 74
- Monitoring Violations
- 500
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MCL | 73 | 2021 |
| Nitrite | MR | 13 | 2011 |
| Dalapon | MR | 11 | 2021 |
| Dinoseb | MR | 11 | 2021 |
| 2,4,5-TP | MR | 11 | 2021 |
| 2,4-D | MR | 11 | 2021 |
| Picloram | MR | 11 | 2021 |
| Chlorine | MR | 9 | 2024 |
| Gross Alpha, Excl. Radon and U | MR | 9 | 2021 |
| 1,2,4-Trichlorobenzene | MR | 8 | 2021 |
| Xylenes, Total | MR | 8 | 2021 |
| DICHLOROMETHANE | MR | 8 | 2021 |
| o-Dichlorobenzene | MR | 8 | 2021 |
| p-Dichlorobenzene | MR | 8 | 2021 |
| trans-1,2-Dichloroethylene | MR | 8 | 2021 |
| 1,2-Dichloroethane | MR | 8 | 2021 |
| 1,1,1-Trichloroethane | MR | 8 | 2021 |
| Trichloroethylene | MR | 8 | 2021 |
| 1,1,2-Trichloroethane | MR | 8 | 2021 |
| Tetrachloroethylene | MR | 8 | 2021 |
| Toluene | MR | 8 | 2021 |
| Ethylbenzene | MR | 8 | 2021 |
| Endrin | MR | 8 | 2021 |
| BHC-GAMMA | MR | 8 | 2021 |
| Methoxychlor | MR | 8 | 2021 |
| Toxaphene | MR | 8 | 2021 |
| Diquat | MR | 8 | 2021 |
| Endothall | MR | 8 | 2021 |
| OXAMYL | MR | 8 | 2021 |
| Simazine | MR | 8 | 2021 |
Violation Count vs. the National Corpus
Mountain Home Air Force Base has 574 recorded EPA violations, 97% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 3% carry more. 13% of this system's own violations are health-based (74 of 574), and it ranks #5,882 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)
574 Higher than most more violations than 97% 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. 10 of 174 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NFDHA | 4/18/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| ADONA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 4/18/2023 | 4.20 ppt | 3.00 ppt | Detected |
| PFPeS | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/18/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 8:2 FTS | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpS | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 4/18/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFDA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 4/18/2023 | 6.10 ppt | 3.00 ppt | Detected |
| PFBS | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 4/18/2023 | 6.30 ppt | 3.00 ppt | Detected |
| PFDoA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 4/18/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 4/18/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFOA | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NEtFOSAA | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 4/18/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFOA | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| ADONA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/18/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 4/18/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFBA | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOS | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 4/18/2023 | 6.20 ppt | 3.00 ppt | Detected |
| PFHpA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 4/18/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 4/18/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| NMeFOSAA | 4/18/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 4/18/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 4/18/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| HFPO-DA | 4/18/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeS | 4/18/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
Population served record for Mountain Home Air Force Base
EPA SDWIS lists 7,500 people served and 1,053 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
574 violations · 7,500 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 Mountain Home Air Force Base
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Idaho compares on the same EPA violation measures. Idaho 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.