Community Water System · PWS WI1110099
Friesland Waterworks
Operator location Friesland, Wisconsin - 36% of 127 violations are health-based (upper-third health share (> 23%)); groundwater source; 345 served per SDWIS.
- 345
- People served (this PWS)
- 127
- EPA violations (this PWS)
- 46
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Friesland Waterworks standing, high SDWIS violation third
36% of 127 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 36% is upper-third health share (> 23%).
The verdict
Friesland Waterworks sits in the upper third of the sitemap cohort by violation count (127), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (345; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 36% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 127
- Total EPA violations on record
- 36%
- Health-based (MCL / treatment failure)
- 345
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
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
- 127
- County
- Columbia
- School/Daycare
- No
- MCL Violations
- 30
- Monitoring Violations
- 74
- Treatment Tech Violations
- 16
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 22 | 2012 |
| Groundwater Rule | TT | 12 | 2019 |
| Lead and Copper Rule | MR | 10 | 2022 |
| Nitrate | MCL | 8 | 2002 |
| Coliform (TCR) | MR | 8 | 2009 |
| Revised Total Coliform Rule | MON | 4 | 2019 |
| Lead and Copper Rule | TT | 4 | 2020 |
| Radium-228 | MR | 4 | 2009 |
| Public Notice | Other | 2 | 2021 |
| Groundwater Rule | Other | 2 | 2023 |
| Endrin | MR | 2 | 1993 |
| BHC-GAMMA | MR | 2 | 1993 |
| Toxaphene | MR | 2 | 1993 |
| Hexachlorocyclopentadiene | MR | 2 | 1993 |
| Aldicarb sulfoxide | MR | 2 | 1993 |
| Aldicarb sulfone | MR | 2 | 1993 |
| 2,4-D | MR | 2 | 1993 |
| HEXACHLOROBENZENE | MR | 2 | 1993 |
| Pentachlorophenol | MR | 2 | 1993 |
| Total Polychlorinated Biphenyls (PCB) | MR | 2 | 1993 |
| Picloram | MR | 2 | 1993 |
| Dalapon | MR | 2 | 1993 |
| Simazine | MR | 2 | 1993 |
| Chlordane | MR | 2 | 1993 |
| Heptachlor | MR | 2 | 1993 |
| 2,4,5-TP | MR | 2 | 1993 |
| OXAMYL | MR | 2 | 1993 |
| LASSO | MR | 2 | 1993 |
| Carbofuran | MR | 2 | 1993 |
| Atrazine | MR | 2 | 1993 |
Violation Count vs. the National Corpus
Friesland Waterworks has 127 recorded EPA violations, 78% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 22% carry more. 36% of this system's own violations are health-based (46 of 127), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
127 Higher than most more violations than 78% 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 Friesland Waterworks
46 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for WI1110099.
Sources: EPA SDWIS · Wisconsin DNR, Drinking Water and Groundwater
Nationwide peers
127 violations · 345 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.
What to do with Friesland 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.