Community Water System · PWS WI1220110
Montfort Waterworks
Operator location Montfort, Wisconsin - 37% of 43 violations are health-based (upper-third health share (> 23%)); groundwater source; 718 served per SDWIS.
- 718
- People served (this PWS)
- 43
- EPA violations (this PWS)
- 16
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Montfort Waterworks standing, mid SDWIS violation third
37% of 43 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 37% is upper-third health share (> 23%). Population rank #24,001 of 29,740 among systems serving 500+.
The verdict
Montfort Waterworks lands in the middle third by violation volume (43), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (718; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 37% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #24,001 of 29,740
- Population · /systems
- #535 of 744
- Population · WI
- 43
- Total EPA violations on record
- 37%
- 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
- 265
- County
- Grant
- School/Daycare
- No
- MCL Violations
- 11
- Monitoring Violations
- 19
- Treatment Tech Violations
- 5
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 13 | 2005 |
| Coliform (TCR) | MCL | 11 | 1995 |
| TTHM | MR | 3 | 2024 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2024 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | 2 | 2014 |
| Groundwater Rule | TT | 2 | 2022 |
| Public Notice | Other | 1 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 1 | 2025 |
| LEAD AND COPPER RULE REVISIONS | TT | 1 | 2024 |
Violation Count vs. the National Corpus
Montfort Waterworks has 43 recorded EPA violations, 52% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 47% carry more. 37% of this system's own violations are health-based (16 of 43), and it ranks #24,001 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)
43 Around the middle fewer violations than 47% 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 Montfort Waterworks
16 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for WI1220110.
Sources: EPA SDWIS · Wisconsin DNR, Drinking Water and Groundwater
Nationwide peers
43 violations · 718 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
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 Montfort Waterworks
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Wisconsin compares on the same EPA violation measures. Wisconsin 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.