Community Water System · PWS IL0990300
La Salle
Operator location La Salle, Illinois - UCMR5 detected 2 PFAS compounds (lower-third PFAS panel (≤ 2 compounds)) on this PWS; SDWIS lists 219 violations and 9,700 people served.
- 9,700
- People served (this PWS)
- 219
- EPA violations (this PWS)
- 39
- Health-based (this PWS)
- 2 PFAS
- UCMR5 (this PWS)
La Salle standing, high SDWIS violation third
UCMR5 detected 2 PFAS compounds - lower-third PFAS panel (≤ 2 compounds). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 18% is middle-third health share (≤ 23%). UCMR5: lower-third PFAS panel (≤ 2 compounds). Population rank #4,811 of 29,740 among systems serving 500+.
The verdict
La Salle sits in the upper third of the sitemap cohort by violation count (219), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (9,700; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 18% (middle-third health share (≤ 23%)). UCMR5 detected 2 PFAS compounds (lower-third PFAS panel (≤ 2 compounds)).
- #4,811 of 29,740
- Population · /systems
- #235 of 1,310
- Population · IL
- 219
- Total EPA violations on record
- 18%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
2 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 3,967
- County
- LaSalle
- School/Daycare
- No
- MCL Violations
- 39
- Monitoring Violations
- 160
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 39 | 2022 |
| Bromate | MR | 10 | 2007 |
| Public Notice | Other | 8 | 2006 |
| Coliform (TCR) | MR | 8 | 2013 |
| Lead and Copper Rule | MR | 5 | 2023 |
| Nitrate | MR | 4 | 1995 |
| Endrin | MR | 4 | 2002 |
| BHC-GAMMA | MR | 4 | 2002 |
| Toxaphene | MR | 4 | 2002 |
| Endothall | MR | 4 | 2002 |
| Simazine | MR | 4 | 2002 |
| Di(2-ethylhexyl) phthalate | MR | 4 | 2002 |
| Picloram | MR | 4 | 2002 |
| Dinoseb | MR | 4 | 2002 |
| Hexachlorocyclopentadiene | MR | 4 | 2002 |
| Aldicarb sulfoxide | MR | 4 | 2002 |
| Aldicarb | MR | 4 | 2002 |
| Atrazine | MR | 4 | 2002 |
| Heptachlor | MR | 4 | 2002 |
| Heptachlor epoxide | MR | 4 | 2002 |
| 2,4-D | MR | 4 | 2002 |
| HEXACHLOROBENZENE | MR | 4 | 2002 |
| Benzo(a)pyrene | MR | 4 | 2002 |
| Pentachlorophenol | MR | 4 | 2002 |
| Total Polychlorinated Biphenyls (PCB) | MR | 4 | 2002 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 4 | 2002 |
| Chlordane | MR | 4 | 2002 |
| ETHYLENE DIBROMIDE | MR | 4 | 2002 |
| Carbofuran | MR | 4 | 2002 |
| LASSO | MR | 4 | 2002 |
Violation Count vs. the National Corpus
La Salle has 219 recorded EPA violations, 87% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 13% carry more. 18% of this system's own violations are health-based (39 of 219), and it ranks #4,811 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)
219 Higher than most more violations than 87% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 3 of 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFDA | 4/7/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 4/7/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDoA | 4/7/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 4/7/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 4/7/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 4/7/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 4/7/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 4/7/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 4/7/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 4/7/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTrDA | 4/7/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFUnA | 4/7/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| HFPO-DA | 4/7/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 4/7/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| NEtFOSAA | 4/7/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMBA | 4/7/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/7/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHpS | 4/7/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 4/7/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeS | 4/7/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 4/7/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 4/7/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 4/7/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 4/7/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 4/7/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 4/7/2025 | 5.20 ppt | 5.00 ppt | Detected |
| ADONA | 4/7/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 4/7/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 4/7/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 10/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 10/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 10/15/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 10/15/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 10/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 6:2 FTS | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMBA | 10/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 10/15/2025 | 6.70 ppt | 5.00 ppt | Detected |
| PFMPA | 10/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 10/15/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 10/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 10/15/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 10/15/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
UCMR5 PFAS record for La Salle
Open EPA SDWIS federal reports for PWS IL0990300 to cross-check UCMR5 detections and violation codes; state primacy agencies enforce the Safe Drinking Water Act locally.
Sources: EPA SDWIS · Illinois EPA, Bureau of Water
Nationwide peers
219 violations · 9,700 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 with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with La Salle
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.