EPA data as of Oct 2026 · page updated 2026-10-30

North Dakota: drinking water & radon

North Dakota has 317 active community water systems. Since 2016, 38 reported health-based violations; 1 had a latest lead result above 15 ppb; 0 measured PFOA or PFOS at or above 4 ppt.

Water systems317

With violations38

Radon zone 1 ZIPs405

ZIPs likely on wells63

Radon zones in North Dakota

tap a county

Zone 1 · highestZone 2 · moderateZone 3 · low

Most health-based violations

City of Maxbass 84 people	12
Twin Buttes Water Plant 792 people	10
City of Parshall 884 people	8
Four Bears Water System 1,200 people	6
Spirit Lake Water Management RWS 4,400 people	4
White Shield Water Treatment Plant 952 people	4
City of Cathay 43 people	4
City of Flaxton 66 people	3
Sundale Hutterian Association 110 people	3
Rainbow Estates 30 people	3

Highest latest lead (90th percentile)

City of Cando 1,115 people	15.2 ppb
City of Carrington 2,065 people	13.9 ppb
City of Minot 48,743 people	13.5 ppb
City of Casselton 2,513 people	12.1 ppb
City of Cathay 43 people	11.5 ppb
Manning Water Board 55 people	11.1 ppb
City of Noonan 121 people	10.4 ppb
City of Tuttle 80 people	9.9 ppb
City of Grafton 4,284 people	9.8 ppb
North Prairie RWD-System III 2,742 people	9.3 ppb

Largest systems

City of Fargo 120,762 people	120,762
City of Bismarck 72,417 people	72,417
Grand Forks Regional WTP 57,339 people	57,339
City of Minot 48,743 people	48,743
City of West Fargo 34,858 people	34,858
City of Williston 26,426 people	26,426
City of Dickinson 25,679 people	25,679
City of Mandan 21,769 people	21,769
City of Jamestown 15,427 people	15,427
Belcourt-Turtle MTN Rural Water System 13,500 people	13,500

All ZIP codes in North Dakota

405 ZIP codes.

58001Abercrombie 58002Absaraka 58004Amenia 58005Argusville 58006Arthur 58007Ayr 58008Barney 58009Blanchard 58011Buffalo 58012Casselton 58013Cayuga 58015Christine 58016Clifford 58017Cogswell 58018Colfax 58021Davenport 58027Enderlin 58029Erie 58030Fairmount 58031Fingal 58032Forman 58033Fort Ransom 58035Galesburg 58036Gardner 58038Grandin 58040Gwinner 58041Hankinson 58042Harwood 58043Havana 58045Hillsboro 58046Hope 58047Horace 58048Hunter 58049Kathryn 58051Kindred 58052Leonard 58053Lidgerwood 58054Lisbon 58056Luverne 58057Mcleod 58058Mantador 58059Mapleton 58060Milnor 58061Mooreton 58062Nome 58063Oriska 58064Page 58065Pillsbury 58067Rutland 58068Sheldon 58069Stirum 58071Tower City 58072Valley City 58074Wahpeton 58075Wahpeton 58076Wahpeton 58077Walcott 58078West Fargo 58079Wheatland 58081Wyndmere 58102Fargo 58103Fargo 58104Fargo 58105Fargo 58106Fargo 58107Fargo 58108Fargo 58109Fargo 58121Fargo 58122Fargo 58124Fargo 58125Fargo 58126Fargo 58201Grand Forks 58203Grand Forks 58204Grand Forks Afb 58205Grand Forks Afb 58206Grand Forks 58207Grand Forks 58208Grand Forks 58210Adams 58212Aneta 58214Arvilla 58216Bathgate 58218Buxton 58219Caledonia 58220Cavalier 58222Crystal 58223Cummings 58224Dahlen 58225Drayton 58227Edinburg 58228Emerado 58229Fairdale 58230Finley 58231Fordville 58233Forest River 58235Gilby 58236Glasston 58237Grafton 58238Hamilton 58239Hannah 58240Hatton 58241Hensel 58243Hoople 58244Inkster 58249Langdon 58250Lankin 58251Larimore 58254Mcville 58255Maida 58256Manvel 58257Mayville 58258Mekinock 58259Michigan 58260Milton 58261Minto 58262Mountain 58265Neche 58266Niagara 58267Northwood 58269Osnabrock 58270Park River 58271Pembina 58272Petersburg 58273Pisek 58274Portland 58275Reynolds 58276Saint Thomas 58277Sharon 58278Thompson 58281Wales 58282Walhalla 58301Devils Lake 58310Agate 58311Alsen 58313Balta 58316Belcourt 58317Bisbee 58318Bottineau 58321Brocket 58323Calvin 58324Cando 58325Churchs Ferry 58327Crary 58329Dunseith 58330Edmore 58331Egeland 58332Esmond 58335Fort Totten 58338Hampden 58339Hansboro 58341Harvey 58343Knox 58344Lakota 58345Lawton 58346Leeds 58348Maddock 58351Minnewaukan 58352Munich 58353Mylo 58355Nekoma 58356New Rockford 58357Oberon 58361Pekin 58362Penn 58363Perth 58365Rocklake 58366Rolette 58367Rolla 58368Rugby 58369Saint John 58370Saint Michael 58372Sarles 58374Sheyenne 58377Starkweather 58379Tokio 58380Tolna 58381Warwick 58382Webster 58384Willow City 58385Wolford 58386York 58401Jamestown 58402Jamestown 58405Jamestown 58413Ashley 58415Berlin 58416Binford 58418Bowdon 58420Buchanan 58421Carrington 58422Cathay 58423Chaseley 58424Cleveland 58425Cooperstown 58426Courtenay 58428Dawson 58429Dazey 58430Denhoff 58431Dickey 58433Edgeley 58436Ellendale 58438Fessenden 58439Forbes 58440Fredonia 58441Fullerton 58442Gackle 58443Glenfield 58444Goodrich 58445Grace City 58448Hannaford 58451Hurdsfield 58452Jessie 58454Jud 58455Kensal 58456Kulm 58458Lamoure 58460Lehr 58461Litchville 58463Mcclusky 58464Mchenry 58466Marion 58467Medina 58472Montpelier 58474Oakes 58475Pettibone 58476Pingree 58477Regan 58478Robinson 58479Rogers 58480Sanborn 58481Spiritwood 58482Steele 58483Streeter 58484Sutton 58486Sykeston 58487Tappen 58488Tuttle 58490Verona 58492Wimbledon 58494Wing 58495Wishek 58496Woodworth 58497Ypsilanti 58501Bismarck 58502Bismarck 58503Bismarck 58504Bismarck 58505Bismarck 58506Bismarck 58507Bismarck 58520Almont 58521Baldwin 58523Beulah 58524Braddock 58528Cannon Ball 58529Carson 58530Center 58531Coleharbor 58532Driscoll 58533Elgin 58535Flasher 58538Fort Yates 58540Garrison 58541Golden Valley 58542Hague 58544Hazelton 58545Hazen 58549Kintyre 58552Linton 58554Mandan 58558Menoken 58559Mercer 58560Moffit 58561Napoleon 58562New Leipzig 58563New Salem 58564Raleigh 58565Riverdale 58566Saint Anthony 58568Selfridge 58569Shields 58570Solen 58571Stanton 58572Sterling 58573Strasburg 58575Turtle Lake 58576Underwood 58577Washburn 58579Wilton 58580Zap 58581Zeeland 58601Dickinson 58602Dickinson 58620Amidon 58621Beach 58622Belfield 58623Bowman 58625Dodge 58626Dunn Center 58627Fairfield 58630Gladstone 58631Glen Ullin 58632Golva 58634Grassy Butte 58636Halliday 58638Hebron 58639Hettinger 58640Killdeer 58641Lefor 58642Manning 58643Marmarth 58644Marshall 58645Medora 58646Mott 58647New England 58649Reeder 58650Regent 58651Rhame 58652Richardton 58653Scranton 58654Sentinel Butte 58655South Heart 58656Taylor 58701Minot 58702Minot 58703Minot 58704Minot Afb 58705Minot Afb 58710Anamoose 58711Antler 58712Balfour 58713Bantry 58716Benedict 58718Berthold 58721Bowbells 58722Burlington 58723Butte 58725Carpio 58727Columbus 58730Crosby 58731Deering 58733Des Lacs 58734Donnybrook 58735Douglas 58736Drake 58737Flaxton 58740Glenburn 58741Granville 58744Karlsruhe 58746Kenmare 58748Kramer 58750Lansford 58752Lignite 58755Mcgregor 58756Makoti 58757Mandaree 58758Martin 58759Max 58760Maxbass 58761Mohall 58762Newburg 58763New Town 58765Noonan 58768Norwich 58769Palermo 58770Parshall 58771Plaza 58772Portal 58773Powers Lake 58775Roseglen 58776Ross 58778Ruso 58779Ryder 58781Sawyer 58782Sherwood 58783Souris 58784Stanley 58785Surrey 58787Tolley 58788Towner 58789Upham 58790Velva 58792Voltaire 58793Westhope 58794White Earth 58795Wildrose 58801Williston 58802Williston 58803Williston 58830Alamo 58831Alexander 58833Ambrose 58835Arnegard 58838Cartwright 58843Epping 58844Fortuna 58845Grenora 58847Keene 58849Ray 58852Tioga 58853Trenton 58854Watford City 58856Zahl

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 North Dakota have violations?

38 of 317 active community water systems in North Dakota reported at least one health-based violation since 2016 (EPA SDWIS).

What is the radon risk in North Dakota?

405 ZIP codes are in EPA radon zone 1 (highest potential), 0 in zone 2 and 0 in zone 3. EPA recommends testing every home.