Dupo

Published drinking-water records and contacts for Dupo. System IL1630350. Review sources and dates; not a real-time water assessment.

System ID: IL1630350
State or territory: IL
Published population served: 4684
System type (source code): CWS

Published records and dates

PFAS / lithium (EPA UCMR 5): 60 — 2025-05-06 – 2025-11-03
Lead and copper monitoring summaries: 15 — 1995-01-01 – 2026-12-31

Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.

Published testing results

Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.

“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example

EPA UCMR 5 — most recent imported sample per substance
Substance	Published result	Reporting limit	Sample date	Sampling location
11Cl-PF3OUdS	< 0.005 µg/L	0.005 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
4:2 FTS	< 0.003 µg/L	0.003 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
6:2 FTS	< 0.005 µg/L	0.005 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
8:2 FTS	< 0.005 µg/L	0.005 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
9Cl-PF3ONS	< 0.002 µg/L	0.002 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
ADONA	< 0.003 µg/L	0.003 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
HFPO-DA	< 0.005 µg/L	0.005 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
NEtFOSAA	< 0.005 µg/L	0.005 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
NFDHA	< 0.02 µg/L	0.02 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
NMeFOSAA	< 0.006 µg/L	0.006 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFBA	< 0.005 µg/L	0.005 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFBS	0.0037 µg/L	0.003 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFDA	< 0.003 µg/L	0.003 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFDoA	< 0.003 µg/L	0.003 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFEESA	< 0.003 µg/L	0.003 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFHpA	< 0.003 µg/L	0.003 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFHpS	< 0.003 µg/L	0.003 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFHxA	< 0.003 µg/L	0.003 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFHxS	< 0.003 µg/L	0.003 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFMBA	< 0.003 µg/L	0.003 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFMPA	< 0.004 µg/L	0.004 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFNA	< 0.004 µg/L	0.004 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFOA	< 0.004 µg/L	0.004 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFOS	0.0045 µg/L	0.004 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFPeA	< 0.003 µg/L	0.003 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFPeS	< 0.004 µg/L	0.004 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFTA	< 0.008 µg/L	0.008 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFTrDA	< 0.007 µg/L	0.007 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
PFUnA	< 0.002 µg/L	0.002 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03
lithium	23 µg/L	9 µg/L	2025-11-03	Treatment Plant (Wells 1 & 2) / TP03

Download all EPA UCMR 5 records (CSV)

Lead and copper: 90th-percentile summaries

These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile

Eight most recent imported monitoring summaries
Substance	Published 90th percentile	Monitoring period	Source quarter
Lead (PB90)	0 mg/L	2024-01-01 – 2026-12-31	2026Q3
Lead (PB90)	0 mg/L	2021-01-01 – 2023-12-31	2026Q3
Lead (PB90)	0 mg/L	2018-01-01 – 2020-12-31	2026Q3
Lead (PB90)	0.0016 mg/L	2015-01-01 – 2017-12-31	2026Q3
Lead (PB90)	0.0012 mg/L	2012-01-01 – 2014-12-31	2026Q3
Lead (PB90)	0 mg/L	2011-01-01 – 2013-12-31	2026Q3
Lead (PB90)	0 mg/L	2009-01-01 – 2011-12-31	2026Q3
Lead (PB90)	0 mg/L	2008-01-01 – 2010-12-31	2026Q3

Published compliance history

4 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.

Twenty most recent imported compliance records
Rule / record	Period	Recorded status	Health-based (EPA classification)	Source quarter
Consumer Confidence Rule / Consumer Confidence Report Complete Failure to Report	2024-07-01 – —	Resolved	No	2026Q3
Consumer Confidence Rule / Consumer Confidence Report Complete Failure to Report	2019-07-01 – —	Resolved	No	2026Q3
Total Coliform Rule / Monitoring, Routine Minor (TCR)	1998-03-01 – 1998-03-31	Archived	No	2026Q3
Total Coliform Rule / Monitoring, Routine Minor (TCR)	1998-02-01 – 1998-02-28	Archived	No	2026Q3

Source dates and refresh checks

A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.

EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17

Administrative contact (EPA filing)

Koonce, Michael G.: 618-286-4200

An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.

Official state resources · How to read these records