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

Wastewater treatment plants in the United States

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14,626 inventory records · HydroWASTE v1.0 / United States

Data years: 2008, 2012. The inventory date does not establish current operation.

States

14,626 results

CompareNameNative sizeYear
NORTHEASTERN YORK MT WOLF STPHW:365235,856 population served2012
OSKALOOSA NE WWTPHW:289435,848 population served2012
JOHNSONBURG BORO STPHW:370025,842 population served2012
WAYNESVILLE WWTPHW:323455,839 population served2012
ISANTI STPHW:313675,836 population served2012
TUSKEGEE NORTH WWTPHW:251125,833 population served2012
NORTH BEND TREATMENT PLANTHW:386185,830 population served2012
WILLIAMSBURG STPHW:300795,828 population served2012
BASEHOR WWTPHW:293495,823 population served2012
Seneca Co SD 1 Willard WWTPHW:340485,823 population served2012
KERSHAW STPHW:371115,822 population served2008
DENTON TWP WWTFHW:308505,817 population served2012
MACKINAW CITY WWTPHW:310825,811 population served2012
Nelsonville WWTP and Sewer SystemHW:352925,804 population served2012
ST CLAIR STPHW:309275,802 population served2012
HOULTON WPCFHW:304255,800 population served2012
Stone County Utility Authority South Stone County WWTFHW:316575,800 population served2012
ROCKY BRANCH CREEK WWTPHW:317245,800 population served2012
LIBERTY WWTPHW:343565,800 population served2012
LOWER SALFORD HARLEYSVILLE STPHW:362505,800 population served2012
Diboll WWTPHW:379635,800 population served2012
STRASBURG STPHW:383465,800 population served2012
TRI LAKES RSD WWTPHW:283805,796 population served2012
MANSFIELD BORO STPHW:364625,795 population served2012
ANACONDA Deer Lodge CountyHW:325465,792 population served2012
DELANO STPHW:312865,789 population served2012
Spring Grove Wastewater SystemHW:277605,782 population served2012
HARMONY GROVE OKEE WWTPHW:395675,781 population served2012
PROSSER WWTPHW:387385,780 population served2012
WILLIAMSTON WWTPHW:343045,778 population served2012
LINTON WWTPHW:281645,774 population served2012
FALLING CREEK WPCPHW:271955,768 population served2012
WINNSBORO STPHW:302055,755 population served2012
MANHEIM BORO STPHW:363285,754 population served2012
Alturas WWTPHW:260985,752 population served2012
WEST PONDHW:301105,750 population served2012
ALGONA WWTPHW:284725,741 population served2012
Mena WWTPHW:257085,737 population served2012
Washingtonville V WWTPHW:337035,726 population served2012
Onondaga Co Brewerton WWTPHW:339365,725 population served2012
SHEPHERDSTOWN WWTPHW:388785,714 population served2012
COOLBAUGH TWP STPHW:364515,711 population served2012
LAWRENCEVILLE STPHW:277965,700 population served2012
LAKE PROVIDENCE S PONDHW:302425,700 population served2012
CENTERVILLE STPHW:373405,700 population served2012
Elsa WWTPHW:376285,700 population served2012
Falfurrias WWTPHW:376555,700 population served2012
Crockett WWTP 1HW:379695,700 population served2012
FARMVILLE WWTPHW:343495,693 population served2012
Guste IslandHW:301725,692 population served2012
RED OAK WWTPHW:289915,688 population served2012
New Paltz V STPHW:336775,684 population served2012
Blytheville West WWTPHW:254255,680 population served2012
Toronto WWTP and Sewer SystemHW:354525,676 population served2012
PCRWRD Corona de Tucson WWTFHW:253605,675 population served2012
Ringwood Borough CS_Septics_STPHW:332545,671 population served2012
Colusa WWTPHW:260005,670 population served2012
STANFORDHW:298955,670 population served2012
SUMMERVILLE STPHW:270885,669 population served2012
CARUTHERSVILLE WWTPHW:320885,668 population served2012
EMPORIA STPHW:384015,665 population served2012
Wellston North WWTP and Sewer SystemHW:354905,663 population served2012
MACCLENNY STPHW:268975,662 population served2012
PONTOTOC WASTEWATER TREATMENT FACIHW:315765,662 population served2012
KBM REGIONAL AUTH STPHW:363485,661 population served2012
George s Creek WWTPHW:305625,660 population served2012
HATTIESBURG NORTH LAGOONHW:314985,659 population served2012
Mount Werner WSDHW:263325,658 population served2012
SPRINGHILL TOWN OFHW:301975,658 population served2012
SOUTH PITTSBURG STPHW:375135,655 population served2012
STAFFORD WPCFHW:266015,650 population served2012
PAHOKEE STPHW:267175,649 population served2012
Desoto County Reg Utility Auth Johnson Creek POTWHW:314525,645 population served2012
SCOTTSBURG WWTPHW:283605,644 population served2012
HOLDREGE WWTPHW:328615,636 population served2012
CHADRON WWTPHW:327375,634 population served2012
BASS LAKE WWTFHW:259975,630 population served2012
Calistoga WWTPHW:258595,629 population served2012
GREENBRIER STPHW:373935,625 population served2012
ZEBULON Little Creek WWTPHW:344185,623 population served2012
FLAGLER BEACH WWTPHW:269105,615 population served2012
SAVANNA City ofHW:275795,615 population served2012
CHESTER ROCKY CK STPHW:371515,613 population served2008
LAKE ALFRED WPFHW:269645,611 population served2012
DAWSON WPCPHW:271825,610 population served2012
Town of WaterburyHW:382305,609 population served2012
LRBSA CLINTON TWP STPHW:364435,604 population served2012
SARALAND WWTPHW:250955,600 population served2012
New Lenox STP 3HW:276045,600 population served2012
Coeymans T STP and On Site SysHW:337525,600 population served2012
HUNTINGBURG WWTPHW:282385,598 population served2012
RED SPRINGS WWTPHW:343675,597 population served2012
MCFARLAND WWTFHW:259725,596 population served2012
Brocton V WWTPHW:340675,594 population served2012
OSAWATOMIE WWTPHW:294965,588 population served2012
MANSFIELD STPHW:302395,582 population served2012
Ada WWTP and Sewer SystemHW:347305,582 population served2012
Keene WWTPHW:378475,582 population served2012
BARBOURVILLE WWTPHW:298935,581 population served2012
SHERIDAN STPHW:361865,580 population served2012

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.