Maryland: drinking water & radon

Maryland has 478 active community water systems. Since 2016, 154 reported health-based violations; 8 had a latest lead result above 15 ppb; 14 measured PFOA or PFOS at or above 4 ppt.

Radon zones in Maryland

tap a county

Zone 1 · highestZone 2 · moderateZone 3 · low

All ZIP codes in Maryland

599 ZIP codes.

20588Dhs20601Waldorf20602Waldorf20603Waldorf20604Waldorf20606Abell20607Accokeek20608Aquasco20609Avenue20610Barstow20611Bel Alton20612Benedict20613Brandywine20615Broomes Island20616Bryans Road20617Bryantown20618Bushwood20619California20620Callaway20621Chaptico20622Charlotte Hall20623Cheltenham20624Clements20625Cobb Island20626Coltons Point20627Compton20628Dameron20629Dowell20630Drayden20632Faulkner20634Great Mills20635Helen20636Hollywood20637Hughesville20639Huntingtown20640Indian Head20643Ironsides20645Issue20646La Plata20650Leonardtown20653Lexington Park20656Loveville20657Lusby20658Marbury20659Mechanicsville20660Morganza20661Mount Victoria20662Nanjemoy20664Newburg20667Park Hall20670Patuxent River20674Piney Point20675Pomfret20676Port Republic20677Port Tobacco20678Prince Frederick20680Ridge20682Rock Point20684Saint Inigoes20685Saint Leonard20686Saint Marys City20687Scotland20688Solomons20689Sunderland20690Tall Timbers20692Valley Lee20693Welcome20695White Plains20697Southern Md Facility20701Annapolis Junction20703Lanham20704Beltsville20705Beltsville20706Lanham20707Laurel20708Laurel20709Laurel20710Bladensburg20711Lothian20712Mount Rainier20714North Beach20715Bowie20716Bowie20717Bowie20718Bowie20719Bowie20720Bowie20721Bowie20722Brentwood20723Laurel20724Laurel20725Laurel20726Laurel20731Capitol Heights20732Chesapeake Beach20733Churchton20735Clinton20736Owings20737Riverdale20738Riverdale20740College Park20741College Park20742College Park20743Capitol Heights20744Fort Washington20745Oxon Hill20746Suitland20747District Heights20748Temple Hills20749Fort Washington20750Oxon Hill20751Deale20752Suitland20753District Heights20754Dunkirk20755Fort George G Meade20757Temple Hills20758Friendship20759Fulton20762Andrews Air Force Base20763Savage20764Shady Side20768Greenbelt20769Glenn Dale20770Greenbelt20771Greenbelt20772Upper Marlboro20773Upper Marlboro20774Upper Marlboro20775Upper Marlboro20776Harwood20777Highland20778West River20779Tracys Landing20781Hyattsville20782Hyattsville20783Hyattsville20784Hyattsville20785Hyattsville20787Hyattsville20788Hyattsville20790Capitol Heights20791Capitol Heights20792Upper Marlboro20794Jessup20797Southern Md Facility20799Capitol Heights20810Bethesda20811Bethesda20812Glen Echo20813Bethesda20814Bethesda20815Chevy Chase20816Bethesda20817Bethesda20818Cabin John20824Bethesda20825Chevy Chase20827Bethesda20830Olney20832Olney20833Brookeville20837Poolesville20838Barnesville20839Beallsville20841Boyds20842Dickerson20847Rockville20848Rockville20849Rockville20850Rockville20851Rockville20852Rockville20853Rockville20854Potomac20855Derwood20857Rockville20859Potomac20860Sandy Spring20861Ashton20862Brinklow20866Burtonsville20868Spencerville20871Clarksburg20872Damascus20874Germantown20875Germantown20876Germantown20877Gaithersburg20878Gaithersburg20879Gaithersburg20880Washington Grove20882Gaithersburg20883Gaithersburg20884Gaithersburg20885Gaithersburg20886Montgomery Village20889Bethesda20891Kensington20892Bethesda20894Bethesda20895Kensington20896Garrett Park20897Suburb Maryland Fac20898Gaithersburg20899Gaithersburg20901Silver Spring20902Silver Spring20903Silver Spring20904Silver Spring20905Silver Spring20906Silver Spring20907Silver Spring20908Silver Spring20910Silver Spring20911Silver Spring20912Takoma Park20913Takoma Park20914Silver Spring20915Silver Spring20916Silver Spring20918Silver Spring20993Silver Spring20997Silver Spring21001Aberdeen21005Aberdeen Proving Ground21009Abingdon21010Gunpowder21012Arnold21013Baldwin21014Bel Air21015Bel Air21017Belcamp21018Benson21020Boring21022Brooklandville21023Butler21027Chase21028Churchville21029Clarksville21030Cockeysville21031Hunt Valley21032Crownsville21034Darlington21035Davidsonville21036Dayton21037Edgewater21040Edgewood21041Ellicott City21042Ellicott City21043Ellicott City21044Columbia21045Columbia21046Columbia21047Fallston21048Finksburg21050Forest Hill21051Fork21052Fort Howard21053Freeland21054Gambrills21056Gibson Island21057Glen Arm21060Glen Burnie21061Glen Burnie21062Glen Burnie21065Hunt Valley21071Glyndon21074Hampstead21075Elkridge21076Hanover21077Harmans21078Havre De Grace21082Hydes21084Jarrettsville21085Joppa21087Kingsville21088Lineboro21090Linthicum Heights21092Long Green21093Lutherville Timonium21094Lutherville Timonium21102Manchester21104Marriottsville21105Maryland Line21106Mayo21108Millersville21111Monkton21113Odenton21114Crofton21117Owings Mills21120Parkton21122Pasadena21123Pasadena21128Perry Hall21130Perryman21131Phoenix21132Pylesville21133Randallstown21136Reisterstown21139Riderwood21140Riva21144Severn21146Severna Park21150Simpsonville21152Sparks Glencoe21153Stevenson21154Street21155Upperco21156Upper Falls21157Westminster21158Westminster21160Whiteford21161White Hall21162White Marsh21163Woodstock21201Baltimore21202Baltimore21203Baltimore21204Towson21205Baltimore21206Baltimore21207Gwynn Oak21208Pikesville21209Baltimore21210Baltimore21211Baltimore21212Baltimore21213Baltimore21214Baltimore21215Baltimore21216Baltimore21217Baltimore21218Baltimore21219Sparrows Point21220Middle River21221Essex21222Dundalk21223Baltimore21224Baltimore21225Brooklyn21226Curtis Bay21227Halethorpe21228Catonsville21229Baltimore21230Baltimore21231Baltimore21233Baltimore21234Parkville21235Baltimore21236Nottingham21237Rosedale21239Baltimore21240Baltimore21241Baltimore21244Windsor Mill21250Baltimore21252Towson21263Baltimore21264Baltimore21270Baltimore21273Baltimore21275Baltimore21278Baltimore21279Baltimore21281Baltimore21282Pikesville21284Towson21285Towson21286Towson21289Baltimore21290Baltimore21297Baltimore21298Baltimore21401Annapolis21402Annapolis21403Annapolis21404Annapolis21405Annapolis21409Annapolis21411Annapolis21412Annapolis21501Cumberland21502Cumberland21503Cumberland21504Cumberland21505Cumberland21520Accident21521Barton21523Bloomington21524Corriganville21528Eckhart Mines21529Ellerslie21530Flintstone21531Friendsville21532Frostburg21536Grantsville21538Kitzmiller21539Lonaconing21540Luke21541Mc Henry21542Midland21543Midlothian21545Mount Savage21550Oakland21555Oldtown21556Pinto21557Rawlings21560Spring Gap21561Swanton21562Westernport21601Easton21607Barclay21609Bethlehem21610Betterton21612Bozman21613Cambridge21617Centreville21619Chester21620Chestertown21622Church Creek21623Church Hill21624Claiborne21625Cordova21626Crapo21627Crocheron21628Crumpton21629Denton21631East New Market21632Federalsburg21634Fishing Creek21635Galena21636Goldsboro21638Grasonville21639Greensboro21640Henderson21641Hillsboro21643Hurlock21644Ingleside21645Kennedyville21647Mcdaniel21648Madison21649Marydel21650Massey21651Millington21652Neavitt21653Newcomb21654Oxford21655Preston21656Price21657Queen Anne21658Queenstown21659Rhodesdale21660Ridgely21661Rock Hall21662Royal Oak21663Saint Michaels21664Secretary21665Sherwood21666Stevensville21667Still Pond21668Sudlersville21669Taylors Island21670Templeville21671Tilghman21672Toddville21673Trappe21675Wingate21676Wittman21677Woolford21678Worton21679Wye Mills21690Chestertown21701Frederick21702Frederick21703Frederick21704Frederick21705Frederick21709Frederick21710Adamstown21711Big Pool21713Boonsboro21714Braddock Heights21715Brownsville21716Brunswick21717Buckeystown21718Burkittsville21719Cascade21720Cavetown21721Chewsville21722Clear Spring21723Cooksville21727Emmitsburg21733Fairplay21734Funkstown21737Glenelg21738Glenwood21740Hagerstown21741Hagerstown21742Hagerstown21746Hagerstown21747Hagerstown21749Hagerstown21750Hancock21754Ijamsville21755Jefferson21756Keedysville21757Keymar21758Knoxville21759Ladiesburg21762Libertytown21765Lisbon21766Little Orleans21767Maugansville21769Middletown21770Monrovia21771Mount Airy21773Myersville21774New Market21775New Midway21776New Windsor21777Point Of Rocks21778Rocky Ridge21779Rohrersville21780Sabillasville21781Saint James21782Sharpsburg21783Smithsburg21784Sykesville21787Taneytown21788Thurmont21790Tuscarora21791Union Bridge21792Unionville21793Walkersville21794West Friendship21795Williamsport21797Woodbine21798Woodsboro21801Salisbury21802Salisbury21803Salisbury21804Salisbury21810Allen21811Berlin21813Bishopville21814Bivalve21817Crisfield21821Deal Island21822Eden21824Ewell21826Fruitland21829Girdletree21830Hebron21835Linkwood21836Manokin21837Mardela Springs21838Marion Station21840Nanticoke21841Newark21842Ocean City21843Ocean City21849Parsonsburg21850Pittsville21851Pocomoke City21852Powellville21853Princess Anne21856Quantico21857Rehobeth21861Sharptown21862Showell21863Snow Hill21864Stockton21865Tyaskin21866Tylerton21867Upper Fairmount21869Vienna21871Westover21872Whaleyville21874Willards21875Delmar21890Westover21901North East21902Perry Point21903Perryville21904Port Deposit21911Rising Sun21912Warwick21913Cecilton21914Charlestown21915Chesapeake City21916Childs21917Colora21918Conowingo21919Earleville21920Elk Mills21921Elkton21922Elkton21930Georgetown

What this is — and isn’t. These are records your water utility and state reported to the EPA, and the EPA’s radon map for your county. They describe the system and the area, not the water from your own tap or the air in your home. For that, read your utility’s annual Consumer Confidence Report and test: lead and radon tests are inexpensive.

Questions

How many water systems in Maryland have violations?

154 of 478 active community water systems in Maryland reported at least one health-based violation since 2016 (EPA SDWIS).

What is the radon risk in Maryland?

252 ZIP codes are in EPA radon zone 1 (highest potential), 253 in zone 2 and 94 in zone 3. EPA recommends testing every home.