Community Water System · PWS MT0000278
Lolo Water and Sewer Dist
Operator location Lolo, Montana - larger served population (> 3,309) at 3,315 people served; 92 SDWIS violations on record from groundwater sources.
- 3,315
- People served (this PWS)
- 92
- EPA violations (this PWS)
- 5
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Lolo Water and Sewer Dist standing, high SDWIS violation third
3,315 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 5% is middle-third health share (≤ 23%). Population rank #9,910 of 29,740 among systems serving 500+.
The verdict
Lolo Water and Sewer Dist sits in the upper third of the sitemap cohort by violation count (92), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (3,315; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 5% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #9,910 of 29,740
- Population · /systems
- #38 of 283
- Population · MT
- 92
- Total EPA violations on record
- 5%
- 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
- 1,243
- County
- Missoula
- School/Daycare
- No
- MCL Violations
- 5
- Monitoring Violations
- 76
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 37 | 2013 |
| Consumer Confidence Rule | Other | 9 | 2022 |
| Nitrate-Nitrite | MR | 7 | 2024 |
| Nitrate | MR | 6 | 1999 |
| Lead and Copper Rule | MR | 5 | 2014 |
| Coliform (TCR) | MCL | 5 | 2008 |
| Asbestos | MR | 4 | 2011 |
| Arsenic | MR | 4 | 2008 |
| Fluoride | MR | 3 | 2008 |
| Chromium | MR | 2 | 1982 |
| Cadmium | MR | 2 | 1982 |
| Selenium | MR | 2 | 1982 |
| Mercury | MR | 2 | 1982 |
| Barium | MR | 2 | 1982 |
Violation Count vs. the National Corpus
Lolo Water and Sewer Dist has 92 recorded EPA violations, 71% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 28% carry more. 5% of this system's own violations are health-based (5 of 92), and it ranks #9,910 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)
92 Around the middle fewer violations than 28% 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 Lolo Water and Sewer Dist
EPA SDWIS lists 3,315 people served and 1,243 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
92 violations · 3,315 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 Lolo Water and Sewer Dist
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.