Community Water System · PWS IL1130850
Mc Lean
Operator location Mc Lean, Illinois - 47% of 38 violations are health-based (upper-third health share (> 23%)); groundwater source; 791 served per SDWIS.
- 791
- People served (this PWS)
- 38
- EPA violations (this PWS)
- 18
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Mc Lean standing, mid SDWIS violation third
47% of 38 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 47% is upper-third health share (> 23%). Population rank #22,817 of 29,740 among systems serving 500+.
The verdict
Mc Lean lands in the middle third by violation volume (38), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (791; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 47% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #22,817 of 29,740
- Population · /systems
- #1,019 of 1,310
- Population · IL
- 38
- Total EPA violations on record
- 47%
- 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
- 361
- County
- McLean
- School/Daycare
- No
- MCL Violations
- 18
- Monitoring Violations
- 7
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 18 | 2006 |
| Combined Radium (-226 and -228) | MR | 4 | 2017 |
| Consumer Confidence Rule | Other | 2 | 2023 |
| Coliform (TCR) | MR | 2 | 2000 |
| Lead and Copper Rule | MR | 1 | 1994 |
Violation Count vs. the National Corpus
Mc Lean has 38 recorded EPA violations, 49% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 50% carry more. 47% of this system's own violations are health-based (18 of 38), and it ranks #22,817 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)
38 Lower than most fewer violations than 50% 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 Mc Lean
18 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for IL1130850.
Sources: EPA SDWIS · Illinois EPA, Bureau of Water
Nationwide peers
38 violations · 791 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 with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Mc Lean
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Illinois compares on the same EPA violation measures. Illinois 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.