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Beloit Wastewater Treatment Facility

555 Willowbrook Rd, Beloit, WI 53511 · Rock County · Publicly Owned Treatment Works

Average flow
4.15 MGD
Design flow
9.5 MGD
NPDES permit
WI0023370
Expired
Permit expires
September 2025
Population served
36,269
CWNS 2022

Beloit Wastewater Treatment Facility is a publicly owned wastewater treatment works in Beloit, Rock County, Wisconsin treating an average of 4.15 million gallons per day against a permitted design capacity of 9.5 MGD, serving about 36,269 residents. It discharges under NPDES permit WI0023370 (expired), which expires in September 2025, with 37 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in December 1998.

Treatment technology

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

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Compliance snapshot (last 3 years)

Total violations
37
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 Beloit Wastewater Treatment Facility in EPA's ICIS system.

Formal actions
1
0 since FY2020
EPA inspections
0
none on record

Latest case · Dec 1998

BELOIT, CITY OF

Administrative order · CWA, Sewage Sludge Disposal · Final Order No Penalty

Source: EPA ECHO, civil enforcement case 05-1997-0714.

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Every action against Beloit 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

24 verified contacts for Beloit 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 Beloit Wastewater Treatment Facility, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Wisconsin

Beloit Town Wastewater Treatment Facility

Beloit · 5 mi away

0.58 MGD

0.26 MGD

Janesville Wastewater Utility

Janesville · 10 mi away

11.03 MGD

0.02 MGD

0.08 MGD

Walworth County Metro

Delavan · 19 mi away

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Beloit 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 October 26, 2026; facility record last updated April 24, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Tertiary treatment · Significant industrial user · all terms


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