Community Water System · PWS IL0295200
Cooks Mills Water Association
Operator location Mattoon, Illinois - smaller served population (≤ 999) at 720 people served; 27 SDWIS violations on record from groundwater sources.
- 720
- People served (this PWS)
- 27
- EPA violations (this PWS)
- 1
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Cooks Mills Water Association standing, mid SDWIS violation third
720 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 4% is middle-third health share (≤ 23%). Population rank #23,945 of 29,740 among systems serving 500+.
The verdict
Cooks Mills Water Association lands in the middle third by violation volume (27), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (720; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 4% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #23,945 of 29,740
- Population · /systems
- #1,077 of 1,310
- Population · IL
- 27
- Total EPA violations on record
- 4%
- 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
- Private
- Connections
- 287
- County
- Coles
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 23
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 7 | 2005 |
| Coliform (TCR) | MR | 6 | 1995 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2005 |
| TTHM | MR | 4 | 2005 |
| Chlorine | MR | 2 | 2008 |
| Lead and Copper Rule | TT | 1 | 1994 |
| Consumer Confidence Rule | Other | 1 | 2025 |
Violation Count vs. the National Corpus
Cooks Mills Water Association has 27 recorded EPA violations, 39% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 60% carry more. 4% of this system's own violations are health-based (1 of 27), and it ranks #23,945 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)
27 Lower than most fewer violations than 60% 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
Population served record for Cooks Mills Water Association
EPA SDWIS lists 720 people served and 287 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Illinois EPA, Bureau of Water
Nationwide peers
27 violations · 720 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 Cooks Mills Water Association
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.