Community Water System · PWS WI4050351
Denmark Waterworks
Operator location Denmark, Wisconsin - 27% of 30 violations are health-based (upper-third health share (> 23%)); surface water source; 2,684 served per SDWIS.
- 2,684
- People served (this PWS)
- 30
- EPA violations (this PWS)
- 8
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Denmark Waterworks standing, mid SDWIS violation third
27% of 30 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 27% is upper-third health share (> 23%). UCMR5: UCMR5 tested, none detected. Population rank #11,400 of 29,740 among systems serving 500+.
The verdict
Denmark Waterworks lands in the middle third by violation volume (30), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 2,684 (mid served population (≤ 3,309)). Health-based share is 27% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #11,400 of 29,740
- Population · /systems
- #222 of 744
- Population · WI
- 30
- Total EPA violations on record
- 27%
- 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
- 976
- County
- Brown
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 14
- Treatment Tech Violations
- 8
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 8 | 2011 |
| Lead and Copper Rule | TT | 6 | 2005 |
| Public Notice | Other | 4 | 2024 |
| Revised Total Coliform Rule | MON | 4 | 2024 |
| Coliform (TCR) | MR | 2 | 1992 |
| Consumer Confidence Rule | Other | 2 | 2009 |
| LEAD AND COPPER RULE REVISIONS | TT | 2 | 2024 |
Violation Count vs. the National Corpus
Denmark Waterworks has 30 recorded EPA violations, 42% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 57% carry more. 27% of this system's own violations are health-based (8 of 30), and it ranks #11,400 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)
30 Lower than most fewer violations than 57% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFEESA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 6/19/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 6/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 6/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 6/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 6/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 6/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 6/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 6/19/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 6/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 6/19/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| NMeFOSAA | 6/19/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFHpA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 6/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTrDA | 6/19/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFUnA | 6/19/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFNA | 6/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NEtFOSAA | 6/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOA | 6/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 6/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 6/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 6/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 6/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 6/19/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFEESA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 6/19/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 6/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 6/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 6/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTA | 6/19/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 6/19/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 6/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 6/19/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFBS | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 6/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
Health-based violations on Denmark Waterworks
8 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for WI4050351.
Sources: EPA SDWIS · Wisconsin DNR, Drinking Water and Groundwater
Nationwide peers
30 violations · 2,684 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Denmark 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.