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St. Charles Wastewater Treatment Facility

1405 S 7th Ave, Saint Charles, IL 60174 · Kane County · Publicly Owned Treatment Works

Average flow
3.17 MGD
Design flow
NPDES permit
ILL022705
Effective
Permit expires
December 2030
Population served
32,709
CWNS 2022

St. Charles Wastewater Treatment Facility is a publicly owned wastewater treatment works in Saint Charles, Kane County, Illinois treating an average of 3.17 million gallons per day, serving about 32,709 residents. It discharges under NPDES permit ILL022705 (effective), which expires in December 2030, with 2 recorded violations in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in January 2023.

Treatment technology

3 treatment structures and unit processes identified at St. Charles Wastewater Treatment Facility.

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See the full treatment train at St. Charles Wastewater Treatment Facility: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations
2
Effluent violations
2

Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.

EPA enforcement history

Federal civil enforcement cases, compliance inspections and informal actions recorded for St. Charles Wastewater Treatment Facility in EPA's ICIS system.

Formal actions
2
1 since FY2020
Penalties assessed
$20,124
all cases
Compliance actions
$6,600
required by EPA orders
EPA inspections
1
latest Aug 2004

Latest case · Jan 2023

City of St. Charles Pretreatment AOC

Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty · Compliance actions $6,600

EPA's description of the case:

AOC sets out measures to correct the alleged violations and bring the facility into compliance with the CWA and the facility's NPDES permit.

Source: EPA ECHO, civil enforcement case 05-2020-0308.

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Every action against St. Charles Wastewater Treatment Facility with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.

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Key contacts

2 verified contacts for St. Charles Wastewater Treatment Facility, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at St. Charles Wastewater Treatment Facility, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Illinois

St Charles Main Stw East, Stw West

Saint Charles · 1 mi away

0.37 MGD

3.21 MGD

10 MGD

Bartlett Stp, Village Of

Bartlett · 8 mi away

1.7 MGD

Wheaton Sanitary District WWTF

Wheaton · 9 mi away

4.5 MGD

Elburn Wwtp, Village Of

Elburn · 9 mi away

0.71 MGD

Roselle-J Botterman STP

Roselle · 11 mi away

0.58 MGD

East Dundee Wwtp, Village Of

East Dundee · 13 mi away

0.81 MGD

St. Charles Wastewater Treatment Facility: frequently asked questions

Sources and methodology

Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.

Data refreshed September 21, 2026; facility record last updated May 17, 2025.


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