Community Water System · PWS MT0002978
Jefferson Hills Wua
Operator location Helena, Montana - smaller served population (≤ 999) at 780 people served; 170 SDWIS violations on record from groundwater sources.
- 780
- People served (this PWS)
- 170
- EPA violations (this PWS)
- 24
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Jefferson Hills Wua standing, high SDWIS violation third
780 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 14% is middle-third health share (≤ 23%). Population rank #22,963 of 29,740 among systems serving 500+.
The verdict
Jefferson Hills Wua sits in the upper third of the sitemap cohort by violation count (170), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (780; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 14% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #22,963 of 29,740
- Population · /systems
- #172 of 283
- Population · MT
- 170
- Total EPA violations on record
- 14%
- 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
- Private
- Connections
- 72
- County
- Jefferson
- School/Daycare
- No
- MCL Violations
- 21
- Monitoring Violations
- 142
- Treatment Tech Violations
- 3
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 21 | 2013 |
| Lead and Copper Rule | MR | 6 | 2024 |
| Coliform (TCR) | MR | 5 | 1994 |
| Endrin | MR | 4 | 2011 |
| Methoxychlor | MR | 4 | 2011 |
| Toxaphene | MR | 4 | 2011 |
| Dalapon | MR | 4 | 2011 |
| Di(2-ethylhexyl) adipate | MR | 4 | 2011 |
| OXAMYL | MR | 4 | 2011 |
| Simazine | MR | 4 | 2011 |
| Dinoseb | MR | 4 | 2011 |
| Hexachlorocyclopentadiene | MR | 4 | 2011 |
| Aldicarb sulfoxide | MR | 4 | 2011 |
| Carbofuran | MR | 4 | 2011 |
| Aldicarb | MR | 4 | 2011 |
| Heptachlor epoxide | MR | 4 | 2011 |
| 2,4,5-TP | MR | 4 | 2011 |
| HEXACHLOROBENZENE | MR | 4 | 2011 |
| Benzo(a)pyrene | MR | 4 | 2011 |
| Pentachlorophenol | MR | 4 | 2011 |
| Consumer Confidence Rule | Other | 4 | 2023 |
| Picloram | MR | 4 | 2011 |
| Heptachlor | MR | 4 | 2011 |
| Atrazine | MR | 4 | 2011 |
| LASSO | MR | 4 | 2011 |
| 2,4-D | MR | 4 | 2011 |
| Di(2-ethylhexyl) phthalate | MR | 4 | 2011 |
| Aldicarb sulfone | MR | 4 | 2011 |
| BHC-GAMMA | MR | 4 | 2011 |
| Chlordane | MR | 4 | 2011 |
Violation Count vs. the National Corpus
Jefferson Hills Wua has 170 recorded EPA violations, 83% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 17% carry more. 14% of this system's own violations are health-based (24 of 170), and it ranks #22,963 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)
170 Higher than most more violations than 83% 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
Population served record for Jefferson Hills Wua
EPA SDWIS lists 780 people served and 72 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
170 violations · 780 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 Jefferson Hills Wua
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.