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Sanitary District Of Decatur

501 Dipper Lane, Decatur, IL 62522 · Macon County · Publicly Owned Treatment Works

Average flow
34.42 MGD
Design flow
—
NPDES permit
ILL028321
Effective
Permit expires
December 2030
Population served
78,304
CWNS 2022

Sanitary District Of Decatur is a publicly owned wastewater treatment plant in Decatur, Macon County, Illinois treating an average of 34.42 million gallons per day, serving about 78,304 residents. It discharges under NPDES permit ILL028321 (effective), which expires in December 2030, with 1 recorded violation in the last three years. EPA has recorded 3 formal enforcement actions naming the plant, the latest in January 2026.

Treatment technology

3 treatment structures and unit processes identified at Sanitary District Of Decatur.

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See the full treatment train at Sanitary District Of Decatur: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations
1
Effluent violations
1

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 Sanitary District Of Decatur in EPA's ICIS system.

Formal actions
3
1 since FY2020
Compliance actions
$3.3M
required by EPA orders
EPA inspections
0
none on record

Latest case · Jan 2026

Decatur WWTP PT | AOC

Administrative order · CWA, NPDES Permit Violations · Final Order Issued

Source: EPA ECHO, civil enforcement case 05-2026-0307.

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Every action against Sanitary District Of Decatur with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.

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Key contacts

8 verified contacts for Sanitary District Of Decatur, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at Sanitary District Of Decatur, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Illinois

Harristown Stp, Village Of

Harristown · 5 mi away

0.08 MGD

Macon Stp, City Of

Macon · 8 mi away

—

Warrensburg STP

Warrensburg · 8 mi away

0.06 MGD

Niantic Stp, Village Of

Niantic · 8 mi away

0.06 MGD

Blue Mound Stp, Village Of

Blue Mound · 11 mi away

0.1 MGD

Illiopolis Stp, Village Of

Illiopolis · 12 mi away

0.18 MGD

Maroa Stp, City Of

Maroa · 14 mi away

0.2 MGD

Cerro Gordo Stp, Village Of

Cerro Gordo · 15 mi away

0.17 MGD

Sanitary District Of Decatur: 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 October 26, 2026; facility record last updated March 4, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biosolids · Filter press · all terms


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