Transient Non-Community Water System · PWS WI2460998
McDonalds Mequon
Operator location Poynette, Wisconsin - upper-third violation load (> 74 violations) with 114 EPA violations; groundwater source; 1,524 served (PWS-level, not municipal population).
- 1,524
- People served (this PWS)
- 114
- EPA violations (this PWS)
- 10
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
McDonalds Mequon standing, high SDWIS violation third
114 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 9% is middle-third health share (≤ 23%). Population rank #15,735 of 29,740 among systems serving 500+.
The verdict
McDonalds Mequon sits in the upper third of the sitemap cohort by violation count (114), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,524 (mid served population (≤ 3,309)). Health-based share is 9% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #15,735 of 29,740
- Population · /systems
- #323 of 744
- Population · WI
- 114
- Total EPA violations on record
- 9%
- 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
- Private
- Connections
- 1
- County
- Ozaukee
- School/Daycare
- No
- MCL Violations
- 6
- Monitoring Violations
- 94
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 92 | 2006 |
| Public Notice | Other | 6 | 2006 |
| Coliform (TCR) | MCL | 6 | 2013 |
| Revised Total Coliform Rule | RPT | 4 | 2017 |
| Revised Total Coliform Rule | TT | 4 | 2017 |
| Nitrate | MR | 2 | 1994 |
Violation Count vs. the National Corpus
McDonalds Mequon has 114 recorded EPA violations, 76% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 24% carry more. 9% of this system's own violations are health-based (10 of 114), and it ranks #15,735 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)
114 Higher than most more violations than 76% 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
SDWIS compliance record for McDonalds Mequon
114 violations on record for WI2460998; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · Wisconsin DNR, Drinking Water and Groundwater
Nationwide peers
114 violations · 1,524 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.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with McDonalds Mequon
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.