Community Water System · PWS IL1190950
St Jacob
Operator location St. Jacob, Illinois - 25% of 73 violations are health-based (upper-third health share (> 23%)); surface water source; 1,835 served per SDWIS.
- 1,835
- People served (this PWS)
- 73
- EPA violations (this PWS)
- 18
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
St Jacob standing, mid SDWIS violation third
25% of 73 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 25% is upper-third health share (> 23%). Population rank #14,287 of 29,740 among systems serving 500+.
The verdict
St Jacob lands in the middle third by violation volume (73), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 1,835 (mid served population (≤ 3,309)). Health-based share is 25% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #14,287 of 29,740
- Population · /systems
- #626 of 1,310
- Population · IL
- 73
- Total EPA violations on record
- 25%
- 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
- 738
- County
- Madison
- School/Daycare
- No
- MCL Violations
- 12
- Monitoring Violations
- 38
- Treatment Tech Violations
- 6
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Total Haloacetic Acids (HAA5) | MR | 8 | 2024 |
| Combined Radium (-226 and -228) | MCL | 6 | 2005 |
| TTHM | MCL | 6 | 2019 |
| Coliform (TCR) | MR | 4 | 2009 |
| Long Term 2 Enhanced Surface Water Treatment Rule | TT | 4 | 2014 |
| Chlorine | MR | 4 | 2009 |
| Consumer Confidence Rule | Other | 4 | 2025 |
| p-Dichlorobenzene | MR | 3 | 1991 |
| 1,2-Dichloroethane | MR | 3 | 1991 |
| Carbon tetrachloride | MR | 3 | 1991 |
| Trichloroethylene | MR | 3 | 1991 |
| 1,1,1-Trichloroethane | MR | 3 | 1991 |
| Benzene | MR | 3 | 1991 |
| 1,1-Dichloroethylene | MR | 3 | 1991 |
| LEAD AND COPPER RULE REVISIONS | TT | 2 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 2 | 2025 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1977 |
| Public Notice | Other | 1 | 2025 |
Violation Count vs. the National Corpus
St Jacob has 73 recorded EPA violations, 66% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 34% carry more. 25% of this system's own violations are health-based (18 of 73), and it ranks #14,287 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)
73 Around the middle fewer violations than 34% 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 St Jacob
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 IL1190950.
Sources: EPA SDWIS · Illinois EPA, Bureau of Water
Nationwide peers
73 violations · 1,835 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 St Jacob
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.