Community Water System · PWS IL0970040
Green Oaks
Operator location Green Oaks, Illinois - 13% of 24 violations are health-based (middle-third health share (≤ 23%)); surface water source; 1,470 served per SDWIS.
- 1,470
- People served (this PWS)
- 24
- EPA violations (this PWS)
- 3
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Green Oaks standing, mid SDWIS violation third
13% of 24 recorded violations are health-based - middle-third health share (≤ 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 13% is middle-third health share (≤ 23%). Population rank #16,184 of 29,740 among systems serving 500+.
The verdict
Green Oaks lands in the middle third by violation volume (24), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 1,470 (mid served population (≤ 3,309)). Health-based share is 13% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #16,184 of 29,740
- Population · /systems
- #707 of 1,310
- Population · IL
- 24
- Total EPA violations on record
- 13%
- 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
- 490
- County
- Lake
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 14
- Treatment Tech Violations
- 3
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 9 | 2009 |
| Chlorine | MR | 4 | 2009 |
| LEAD AND COPPER RULE REVISIONS | RPT | 4 | 2025 |
| LEAD AND COPPER RULE REVISIONS | TT | 2 | 2024 |
| Consumer Confidence Rule | Other | 2 | 2025 |
| Lead and Copper Rule | MR | 1 | 1996 |
| Lead and Copper Rule | TT | 1 | 1997 |
| Public Notice | Other | 1 | 2025 |
Violation Count vs. the National Corpus
Green Oaks has 24 recorded EPA violations, 36% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 63% carry more. 13% of this system's own violations are health-based (3 of 24), and it ranks #16,184 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)
24 Lower than most fewer violations than 63% 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 Green Oaks
3 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for IL0970040.
Sources: EPA SDWIS · Illinois EPA, Bureau of Water
Nationwide peers
24 violations · 1,470 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 Green Oaks
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.