Community Water System · PWS WI1330073
Darlington Waterworks
Operator location Darlington, Wisconsin - 33% of 45 violations are health-based (upper-third health share (> 23%)); groundwater source; 2,235 served per SDWIS.
- 2,235
- People served (this PWS)
- 45
- EPA violations (this PWS)
- 15
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Darlington Waterworks standing, mid SDWIS violation third
33% of 45 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 33% is upper-third health share (> 23%). Population rank #12,744 of 29,740 among systems serving 500+.
The verdict
Darlington Waterworks lands in the middle third by violation volume (45), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 2,235 (mid served population (≤ 3,309)). Health-based share is 33% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #12,744 of 29,740
- Population · /systems
- #253 of 744
- Population · WI
- 45
- Total EPA violations on record
- 33%
- 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
- 827
- County
- Lafayette
- School/Daycare
- No
- MCL Violations
- 13
- Monitoring Violations
- 17
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 13 | 2014 |
| Coliform (TCR) | MR | 8 | 2008 |
| Chlorine | MR | 8 | 2008 |
| Public Notice | Other | 2 | 2024 |
| Lead and Copper Rule | MR | 1 | 2005 |
| Lead and Copper Rule | TT | 1 | 2006 |
| LEAD AND COPPER RULE REVISIONS | TT | 1 | 2024 |
Violation Count vs. the National Corpus
Darlington Waterworks has 45 recorded EPA violations, 54% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 46% carry more. 33% of this system's own violations are health-based (15 of 45), and it ranks #12,744 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)
45 Around the middle fewer violations than 46% 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 Darlington Waterworks
15 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for WI1330073.
Sources: EPA SDWIS · Wisconsin DNR, Drinking Water and Groundwater
Nationwide peers
45 violations · 2,235 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 Darlington 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.