Transient Non-Community Water System · PWS WI1110165
WI DOT Rest Area 12 Dekorra West Bound
Operator location Madison, Wisconsin - 70% of 53 violations are health-based (upper-third health share (> 23%)); groundwater source; 3,255 served per SDWIS.
- 3,255
- People served (this PWS)
- 53
- EPA violations (this PWS)
- 37
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
WI DOT Rest Area 12 Dekorra West Bound standing, mid SDWIS violation third
70% of 53 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 70% is upper-third health share (> 23%). Population rank #10,035 of 29,740 among systems serving 500+.
The verdict
WI DOT Rest Area 12 Dekorra West Bound lands in the middle third by violation volume (53), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 3,255 (mid served population (≤ 3,309)). Health-based share is 70% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #10,035 of 29,740
- Population · /systems
- #191 of 744
- Population · WI
- 53
- Total EPA violations on record
- 70%
- 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
- Transient Non-Community
- Owner Type
- State
- Connections
- 1
- County
- Columbia
- School/Daycare
- No
- MCL Violations
- 37
- Monitoring Violations
- 15
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 28 | 2012 |
| Coliform (TCR) | MR | 15 | 2002 |
| Nitrate-Nitrite | MCL | 9 | 2006 |
Violation Count vs. the National Corpus
WI DOT Rest Area 12 Dekorra West Bound has 53 recorded EPA violations, 58% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 41% carry more. 70% of this system's own violations are health-based (37 of 53), and it ranks #10,035 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)
53 Around the middle fewer violations than 41% 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 WI DOT Rest Area 12 Dekorra West Bound
37 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for WI1110165.
Sources: EPA SDWIS · Wisconsin DNR, Drinking Water and Groundwater
Nationwide peers
53 violations · 3,255 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 WI DOT Rest Area 12 Dekorra West Bound
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.