Kendall County Water Quality: 5 Cities Ranked by the Records
Kendall County, Illinois: 5 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 4 systems of 5 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest114 µg/L
- OSWEGO114 µg/LSample date: 2024-08-28 to 2025-02-14
- YORKVILLE49.5 µg/LSample date: 2024-11-06 to 2025-05-27
- MINOOKA47.9 µg/LSample date: 2024-05-08 to 2024-11-19
- MONTGOMERY32.7 µg/LSample date: 2025-04-22 to 2025-11-04
- PLANONot detected · below 9.0 µg/L lab reporting limitSample date: 2023-06-21 to 2024-02-14
Lead (90th percentile)Detected in 3 systems of 5 tested15 µg/L federal action level · US EPAHighest12 µg/L
- PLANO12 µg/LMonitoring period: 2025–2025
- YORKVILLE1.45 µg/LMonitoring period: 2025–2025
- MINOOKA1.07 µg/LMonitoring period: 2025–2025
- MONTGOMERYNot detectedMonitoring period: 2024–2026 (still open)
- OSWEGONot detectedMonitoring period: 2025–2025
Perfluorobutanesulfonic acid (PFBS)Detected in 1 system of 5 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest4 ng/L
- MINOOKA4 ng/LSample date: 2024-05-08 to 2024-11-19
- MONTGOMERYNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-04-22 to 2025-10-30
- OSWEGONot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-28 to 2025-02-14
- PLANONot detected · below 3.0 ng/L lab reporting limitSample date: 2023-06-21 to 2024-02-14
- YORKVILLENot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-06 to 2025-05-27
28 PFAS tested, none detected in any systemShow
Tested in these 5 systems: MINOOKA, MONTGOMERY, OSWEGO, PLANO, YORKVILLE
- 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)
- 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)
- Perfluorobutanoic acid (PFBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorohexanesulfonic acid (PFHxS)
- Perfluorohexanoic acid (PFHxA)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanesulfonic acid (PFOS)
- Perfluorooctanoic acid (PFOA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluoropentanoic acid (PFPeA)
- 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 5 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
- OswegoOSWEGO · IL093015038,169 served
- MontgomeryMONTGOMERY · IL089469028,956 served
- YorkvilleYORKVILLE · IL093025023,000 served
- MinookaMINOOKA · IL063055012,800 served
- PlanoPLANO · IL093020012,600 served
Frequently asked
How does Kendall County tap water compare across cities?
PurityMap ranks 5 cities in Kendall 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 Montgomery's main water system: MONTGOMERY · PWSID IL0894690 · 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 Kendall County cities had a PFAS sample above a 2024 EPA limit?
None of the 5 Kendall 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 Kendall County tap water?
Utilities report lead as a 90th-percentile result from home taps. 3 of 5 Kendall 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 Kendall County water systems had drinking-water violations?
1 city in Kendall 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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