Community Water System · PWS MT0000271
Lewistown City Of
Operator location Lewistown, Montana - 23% of 512 violations are health-based (upper-third health share (> 23%)); groundwater source; 5,923 served per SDWIS.
- 5,923
- People served (this PWS) Larger third of systems
- 512
- EPA violations (this PWS) Upper third of systems
- 117
- Health-based (this PWS) Upper third by health-based share
- No PFAS
- UCMR5 (this PWS) Tested, none detected
Lewistown City Of standing, high SDWIS violation third
23% of 512 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 23% is upper-third health share (> 23%). UCMR5: UCMR5 tested, none detected. Population rank #6,903 of 29,740 among systems serving 500+.
The verdict
Lewistown City Of sits in the upper third of the sitemap cohort by violation count (512), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (5,923; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 23% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #6,903 of 29,740
- Population · /systems
- #22 of 283
- Population · MT
- 512
- Total EPA violations on record
- 23%
- 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
- 2,906
- County
- Fergus
- School/Daycare
- No
- MCL Violations
- 117
- Monitoring Violations
- 386
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 117 | 2016 |
| Coliform (TCR) | MR | 14 | 2007 |
| Consumer Confidence Rule | Other | 9 | 2025 |
| Fluoride | MR | 8 | 2014 |
| Chromium | MR | 8 | 2014 |
| Cadmium | MR | 8 | 2014 |
| Barium | MR | 8 | 2014 |
| Selenium | MR | 8 | 2014 |
| Arsenic | MR | 8 | 2014 |
| Mercury | MR | 8 | 2014 |
| Antimony, Total | MR | 7 | 2014 |
| Thallium, Total | MR | 7 | 2014 |
| Nickel | MR | 7 | 2014 |
| Beryllium, Total | MR | 7 | 2014 |
| Endrin | MR | 6 | 2014 |
| BHC-GAMMA | MR | 6 | 2014 |
| Dalapon | MR | 6 | 2014 |
| OXAMYL | MR | 6 | 2014 |
| Picloram | MR | 6 | 2014 |
| Dinoseb | MR | 6 | 2014 |
| Carbofuran | MR | 6 | 2014 |
| Atrazine | MR | 6 | 2014 |
| LASSO | MR | 6 | 2014 |
| Heptachlor epoxide | MR | 6 | 2014 |
| 2,4-D | MR | 6 | 2014 |
| 2,4,5-TP | MR | 6 | 2014 |
| Benzo(a)pyrene | MR | 6 | 2014 |
| Pentachlorophenol | MR | 6 | 2014 |
| Chlordane | MR | 6 | 2014 |
| 1,2,4-Trichlorobenzene | MR | 6 | 2014 |
Violation Count vs. the National Corpus
Lewistown City Of has 512 recorded EPA violations, 95% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 4% carry more. 23% of this system's own violations are health-based (117 of 512), and it ranks #6,903 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)
512 Higher than most more violations than 95% 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
Lewistown 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 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| 9Cl-PF3ONS | 8/18/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| NEtFOSAA | 8/18/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 8/18/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 8/18/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 8/18/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFHpS | 8/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/18/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 8/18/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 8/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 8/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 8/18/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 8/18/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 8/18/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFBA | 8/18/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 8/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/18/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 8/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 8/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 8/18/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 8/18/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 8/18/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 8/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 8/18/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 8/18/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFPeA | 2/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 2/18/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 2/18/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 2/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 2/18/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 2/18/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 2/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 2/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 2/18/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 2/18/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NMeFOSAA | 2/18/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTrDA | 2/18/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFHpS | 2/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 2/18/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| NEtFOSAA | 2/18/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 2/18/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 9Cl-PF3ONS | 2/18/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 2/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 2/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 2/18/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 2/18/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
Health-based violations on Lewistown City Of
117 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MT0000271.
Sources: EPA SDWIS
Nationwide peers
512 violations · 5,923 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 Lewistown City Of
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Montana compares on the same EPA violation measures. Montana 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.