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States → Illinois

WILLIAMSVILLE

PWS ID: IL1671300 · WILLIAMSVILLE, Illinois 62693

Population Served
6,198
Total Violations
8
Health-Based Violations
0
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
2,678
County
Sangamon
School/Daycare
No
MCL Violations
0
Monitoring Violations
8
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MR 4 2025
Total Haloacetic Acids (HAA5) MR 4 2025

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
PFTA 8/14/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 8/14/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFUnA 8/14/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHpS 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 8/14/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 8/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 8/14/2024 <0.006 µg/L 0.006 µg/L Not Detected
11Cl-PF3OUdS 8/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
NEtFOSAA 8/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 8/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/14/2024 <0.002 µg/L 0.002 µg/L Not Detected
lithium 8/14/2024 <9 µg/L 9 µg/L Not Detected
ADONA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 5/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 5/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
6:2 FTS 5/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 5/8/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 5/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 5/8/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 5/8/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFHpS 5/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 5/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 5/8/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 5/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 5/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 5/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 5/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 5/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 5/8/2024 <9 µg/L 9 µg/L Not Detected
PFHxA 5/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 5/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 5/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 5/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.