Community Water System · PWS MT0000239
Harlem City Of
Operator location Harlem, Montana - 53% of 561 violations are health-based (upper-third health share (> 23%)); surface water source; 820 served per SDWIS.
- 820
- People served (this PWS)
- 561
- EPA violations (this PWS)
- 298
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Harlem City Of standing, high SDWIS violation third
53% of 561 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 53% is upper-third health share (> 23%). Population rank #22,151 of 29,740 among systems serving 500+.
The verdict
Harlem City Of sits in the upper third of the sitemap cohort by violation count (561), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (820; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 53% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #22,151 of 29,740
- Population · /systems
- #158 of 283
- Population · MT
- 561
- Total EPA violations on record
- 53%
- 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
- 375
- County
- Blaine
- School/Daycare
- No
- MCL Violations
- 293
- Monitoring Violations
- 228
- Treatment Tech Violations
- 5
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 226 | 2025 |
| Total Haloacetic Acids (HAA5) | MCL | 67 | 2024 |
| CARBON, TOTAL | MR | 45 | 2004 |
| Total Haloacetic Acids (HAA5) | MR | 26 | 2025 |
| TTHM | MR | 26 | 2025 |
| Consumer Confidence Rule | Other | 25 | 2025 |
| Revised Total Coliform Rule | MON | 23 | 2024 |
| Lead and Copper Rule | MR | 8 | 2024 |
| Arsenic | MR | 7 | 2016 |
| Coliform (TCR) | MR | 6 | 2016 |
| Nitrate | MR | 3 | 1997 |
| Surface Water Treatment Rule | MR | 3 | 2014 |
| 1,2,4-Trichlorobenzene | MR | 3 | 2021 |
| cis-1,2-Dichloroethylene | MR | 3 | 2021 |
| p-Dichlorobenzene | MR | 3 | 2021 |
| 1,1-Dichloroethylene | MR | 3 | 2021 |
| trans-1,2-Dichloroethylene | MR | 3 | 2021 |
| 1,2-Dichloroethane | MR | 3 | 2021 |
| Carbon tetrachloride | MR | 3 | 2021 |
| 1,2-Dichloropropane | MR | 3 | 2021 |
| 1,1,2-Trichloroethane | MR | 3 | 2021 |
| Tetrachloroethylene | MR | 3 | 2021 |
| Benzene | MR | 3 | 2021 |
| Toluene | MR | 3 | 2021 |
| Ethylbenzene | MR | 3 | 2021 |
| Styrene | MR | 3 | 2021 |
| Long Term 2 Enhanced Surface Water Treatment Rule | TT | 3 | 2024 |
| Vinyl chloride | MR | 3 | 2021 |
| Long Term 2 Enhanced Surface Water Treatment Rule | MR | 3 | 2014 |
| o-Dichlorobenzene | MR | 3 | 2021 |
Violation Count vs. the National Corpus
Harlem City Of has 561 recorded EPA violations, 96% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 4% carry more. 53% of this system's own violations are health-based (298 of 561), and it ranks #22,151 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)
561 Higher than most more violations than 96% 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
Health-based violations on Harlem City Of
298 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MT0000239.
Sources: EPA SDWIS
Nationwide peers
561 violations · 820 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 smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Harlem 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.