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

Wastewater treatment plants in United States · Maryland

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172 inventory records · HydroWASTE v1.0 / United States

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

172 results

CompareNameNative sizeYear
BACK RIVER WWTPHW:30523998,745 population served2012
Patapsco WWTPHW:30524462,012 population served2012
OCEAN CITY WWTPHW:30644205,000 population served2012
WESTERN BRANCH WWTPHW:30547164,252 population served2012
PISCATAWAY WWTPHW:30548150,827 population served2012
Little Patuxent WWTPHW:30545117,556 population served2012
COX CREEK WWTPHW:30525107,272 population served2012
SOD RUN WWTPHW:3054191,487 population served2012
Mattawoman WWTPHW:3057490,111 population served2012
SENECA CREEK WWTPHW:3068377,000 population served2012
SALISBURY WWTFHW:3064266,400 population served2012
CUMBERLAND WWTPHW:3056661,876 population served2012
HAGERSTOWN WPCFHW:3063453,983 population served2012
Ballenger_McKinney WWTPHW:3058647,095 population served2012
Marley Taylor WRFHW:3061245,207 population served2012
Annapolis City WWTPHW:3053143,538 population served2012
PATUXENT WWTPHW:3052838,830 population served2012
PARKWAY STPHW:3054627,202 population served2012
Gas House Pike WWTPHW:3059124,898 population served2012
Bowie Belair WWTPHW:3054924,583 population served2012
WESTMINSTER WWTPHW:3054022,440 population served2012
LA PLATA WWTPHW:3058120,000 population served2012
Seneca Point NERAWWTPHW:3055017,301 population served2012
ABERDEEN WWTPHW:3054315,982 population served2012
Kent Nrrws_Stevensville_GrasonvilleHW:3060915,826 population served2012
EASTON WWTPHW:3062615,139 population served2012
Cambridge WWTF and Coll SysHW:3058214,722 population served2012
ELKTON WWTPHW:3055713,750 population served2012
Ocean Pines WWTPHW:3069413,000 population served2012
MARYLAND CITY WWTPHW:3052612,374 population served2012
Conococheague WWTPHW:3069311,423 population served2012
Havre de Grace WWTPHW:3054411,000 population served2012
Freedom District WWTPHW:3053310,998 population served2012
Celanese WWTPHW:3056010,740 population served2012
CHESAPEAKE BEACH WWTPHW:3056810,672 population served2012
BROADNECK WWTPHW:3052710,606 population served2012
Trout Run WWTP and Coll SysHW:305969,917 population served2012
SOLOMONS ISLAND WWTPHW:305677,024 population served2012
JOPPATOWNE WWTPHW:306907,000 population served2012
MAYO WWTPHW:305306,720 population served2012
BROADWATER WWTPHW:305296,444 population served2012
George s Creek WWTPHW:305625,660 population served2012
THURMONT WWTPHW:305945,490 population served2012
PRINCESS ANNE WWTPHW:306185,400 population served2012
CRISFIELD WWTPHW:306225,200 population served2012
DAMASCUS WWTPHW:306824,920 population served2012
Delmar STP and Coll SysHW:306394,902 population served2012
Manchester WWTP and Coll SysHW:305354,800 population served2012
PORT DEPOSIT WWTPHW:306624,752 population served2012
POCOMOKE CITY WWTPHW:306484,600 population served2012
CHESTERTOWN WWTPHW:306074,512 population served2012
EMMITSBURG WWTPHW:305904,460 population served2012
DENTON WWTPHW:305694,418 population served2012
Mt Airy WWTPHW:305364,321 population served2012
TANEYTOWN STPHW:305384,285 population served2012
CENTREVILLE WWTPHW:306114,285 population served2012
PERRYVILLE WWTPHW:305584,200 population served2012
Eastern Correctional Institution WWTPHW:306634,100 population served2012
Upper Potomac River Comm WWTPHW:306734,047 population served2012
Berlin WWTPHW:306474,000 population served2012
Hampstead WWTP and Coll SysHW:305323,945 population served2012
FRUITLAND WWTPHW:306403,870 population served2012
BOWIE STATE COLLEGE STPHW:306593,857 population served2012
POOLESVILLE STPHW:306753,800 population served2012
DEEP CREEK LAKE WWTPHW:305953,651 population served2012
Meadow View WWTPHW:305513,500 population served2012
Talbot County Region II WWTPHW:306243,500 population served2012
BRUNSWICK WWTPHW:305893,457 population served2012
INDIAN HEAD WWTPHW:305803,400 population served2012
BOONSBORO WWTPHW:306313,336 population served2012
Winebrenner WWTPHW:306283,157 population served2012
FOUNTAINDALE WWTPHW:305873,000 population served2012
Mystic Harbour WWTPHW:306463,000 population served2012
Point Lookout State Park WWTPHW:306542,770 population served2012
SNOW HILL WWTPHW:306492,720 population served2012
FEDERALSBURG WWTFHW:305702,626 population served2012
RISING SUN STPHW:305592,600 population served2012
MYERSVILLE WWTPHW:306712,600 population served2012
ROCKY GAP STATE PARKHW:306602,542 population served2012
LEONARDTOWN STPHW:306172,300 population served2012
JEFFERSON WWTPHW:305852,209 population served2012
OAKLAND WWTPHW:305982,180 population served2012
Hurlock WWTP and Collection SystemHW:305832,131 population served2012
Greensboro WWTPHW:305712,000 population served2012
ROCK HALL WWTPHW:306081,945 population served2012
Cobb Island WWTPHW:305751,920 population served2012
Chopticon High School WWTPHW:306161,844 population served2012
SMITHSBURG WWTPHW:306361,826 population served2012
Hancock STPHW:306351,700 population served2012
Prince Frederick WWTP IHW:306791,665 population served2012
Ridgely WWTPHW:305731,600 population served2012
NEW WINDSOR WWTPHW:305371,500 population served2012
Maryland Correctional Inst MCIHW:306521,500 population served2012
GREENBRIER STATE PARKHW:306531,500 population served2012
Tolchester WWTPHW:306061,467 population served2012
Antietam WWTPHW:306291,373 population served2012
Wicomico Shores WWTPHW:306151,254 population served2012
FUNKSTOWN WWTPHW:306331,214 population served2012
TRAPPE WWTPHW:306771,201 population served2012
MIDDLETOWN WWTPHW:305921,197 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.