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World wastewater treatment plant observatory · data as reported by each inventory

Wastewater treatment plants in United States · Delaware

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16 inventory records · EPA Clean Watersheds Needs Survey 2022

Data years: 2022. The inventory date does not establish current operation.

16 results

CompareNameNative sizeYear
WILMINGTON STPWilmington105 MGD (million gallons per day)2022
KENT COUNTY STPMilford16.3 MGD (million gallons per day)2022
South Coastal WWTFFrankford9 MGD (million gallons per day)2022
Wolfe Neck WWTFRehoboth Beach4 MGD (million gallons per day)2022
Rehoboth Beach WWTFRehoboth Beach3.4 MGD (million gallons per day)2022
MIDDLETOWN C.S.Middletown2.5 MGD (million gallons per day)2022
Inland Bays WWTFMillsboro2.13 MGD (million gallons per day)2022
SEAFORD STPSeaford2 MGD (million gallons per day)2022
Water Farm I STPNew Castle1.7 MGD (million gallons per day)2022
Lewes WWTFLewes1.5 MGD (million gallons per day)2022
GEORGETOWN STPGeorgetown1.3 MGD (million gallons per day)2022
Millsboro State Street STPMillsboro1.15 MGD (million gallons per day)2022
LAUREL STPLaurel0.7 MGD (million gallons per day)2022
SELBYVILLE STPSelbyville0.634 MGD (million gallons per day)2022
DELAWARE CITY STPNew Castle0.57 MGD (million gallons per day)2022
PORT PENN STP.Middletown0.05 MGD (million gallons per day)2022

Regulatory context

General reference. This is not an exhaustive review of applicable law.

United States: Clean Water Act / NPDES

NPDES regulates pollutant discharges from point sources to waters of the United States. The permit sets limits and monitoring conditions. A CWNS code identifies an inventory record, not an NPDES permit.

  • Permit identifier and permitting authority: EPA or an authorized state.
  • Outfall and receiving water; sewer connections follow a different control route.
  • Current permit conditions, limits and dated measurements; these are not included in CWNS.

References reviewed: 2026-11-06. Individual applicability: undetermined. This profile does not establish authorization or compliance.