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

Wastewater treatment plants in United States · Delaware

17 inventory records · HydroWASTE v1.0 / United States

Data years: 2012. The inventory date does not establish current operation.

17 results

Name	Native size	Year
WILMINGTON STPHW:26637	480,797 population served	2012
KENT COUNTY STPHW:26630	103,810 population served	2012
SO COASTAL STPHW:26621	80,249 population served	2012
REHOBOTH BEACH STPHW:26632	63,281 population served	2012
WOLFE NECK STPHW:26623	48,958 population served	2012
INLAND BAYS WTFHW:26624	36,375 population served	2012
Water Farm I STPHW:26634	17,531 population served	2012
SEAFORD STPHW:26633	9,482 population served	2012
GEORGETOWN STPHW:26628	8,192 population served	2012
LEWES STPHW:26631	7,580 population served	2012
BRIDGEVILLE STPHW:26625	4,263 population served	2012
LAUREL STPHW:26626	3,676 population served	2012
FRANKFORD DAGSBORO SSDHW:26622	2,903 population served	2012
SELBYVILLE STPHW:26629	2,790 population served	2012
MILLSBORO STPHW:26627	2,740 population served	2012
DELAWARE CITY STPHW:26635	2,621 population served	2012
PORT PENN STPHW:26636	676 population served	2012

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.

US EPA · NPDES Permit Basics

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