LaSalle County Water Quality: 2 Cities Ranked by the Records
LaSalle County, Illinois: 2 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
LithiumDetected in 2 systems10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest14.5 µg/L
- IL AMERICAN-STREATOR14.5 µg/LSample date: 2023-11-01 to 2024-08-06
- OTTAWA13.1 µg/LSample date: 2025-03-11 to 2025-09-10
Perfluorobutanesulfonic acid (PFBS)Detected in 1 system of 2 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest5.5 ng/L
- IL AMERICAN-STREATOR5.5 ng/LSample date: 2023-11-01 to 2024-08-06
- OTTAWANot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-11 to 2025-10-16
Perfluorohexanoic acid (PFHxA)Detected in 1 system of 2 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest3.9 ng/L
- IL AMERICAN-STREATOR3.9 ng/LSample date: 2023-11-01 to 2024-08-06
- OTTAWANot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-11 to 2025-10-16
Perfluorobutanoic acid (PFBA)Detected in 1 system of 2 testedNo federal or state limit; shown for transparencyHighest7.1 ng/L
- IL AMERICAN-STREATOR7.1 ng/LSample date: 2023-11-01 to 2024-08-06
- OTTAWANot detected · below 5.0 ng/L lab reporting limitSample date: 2025-03-11 to 2025-10-16
Perfluoropentanoic acid (PFPeA)Detected in 1 system of 2 testedNo federal or state limit; shown for transparencyHighest4.3 ng/L
- IL AMERICAN-STREATOR4.3 ng/LSample date: 2023-11-01 to 2024-08-06
- OTTAWANot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-11 to 2025-10-16
26 substances tested, none detected in any systemShow
Tested in these 2 systems: IL AMERICAN-STREATOR, OTTAWA
- 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- Lead (90th percentile)
- N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Perfluoro-3-methoxypropanoic acid (PFMPA)
- Perfluoro-4-methoxybutanoic acid (PFMBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorohexanesulfonic acid (PFHxS)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanesulfonic acid (PFOS)
- Perfluorooctanoic acid (PFOA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
0of 2 cities above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in IllinoisLargest water systems
Frequently asked
How does LaSalle County tap water compare across cities?
PurityMap ranks 2 cities in LaSalle County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Streator's main water system: IL AMERICAN-STREATOR · PWSID IL0995030 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many LaSalle County cities had a PFAS sample above a 2024 EPA limit?
None of the 2 LaSalle County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 1.
Is there lead in LaSalle County tap water?
Utilities report lead as a 90th-percentile result from home taps. 0 of 2 LaSalle County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
Have LaSalle County water systems had drinking-water violations?
1 city in LaSalle County has a health-based violation in the federal SDWIS record within about the last ten years. Each city report lists the contaminant, year and whether it was resolved.
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