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EWG's Tap Water Database — 2019 UPDATE

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Montana

  • 744 Utilities

  • Serving: 715,000

  • Data available: 2012-2017

  • Contaminants Found: 61

 

EWG's drinking water quality report for Montana shows results of tests conducted by the water utilities in Montana and provided to EWG by the Montana Department of Environmental Quality.

LARGE UTILITIES
ALL UTILITIES WITH VIOLATIONS
LARGE UTILITIES WITH VIOLATIONS

Below are utilities in Montana serving over 10,000 people, listed alphabetically.

Large utilities in Montana

UtilityLocationPeople
Served
Butte-Silver Bow Water DepartmentButte, MT33,000
City of BillingsBillings, MT114,000
City of BozemanBozeman, MT32,000
City of Great FallsGreat Falls, MT60,000
Co Water District of Billings HeightsBillings, MT12,000
Helena Water SystemHelena, MT31,005
Kalispell Public WorksKalispell, MT20,008
Mountain Water CompanyMissoula, MT56,335

Utilities that accumulated/accrued the most violation points as of April 2016 to March 2019 in Montana

The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.

UtilityLocationPeople
Served
Violation
Points
St. Labre Indian SchoolAshland, MT650206
Harlem, City ofHarlem, MT820133
Clarks LookoutDillon, MT62101
Turner ColonyTurner, MT5578
Blue Cloud SubdivisionHelena, MT6068
Rivers Edge Mobile ParkLibby, MT6068
Milford Colony Inc.Wolf Creek, MT6764
Flaxville, Town ofFlaxville, MT8264
Arrow Creek Trailer CourtWorden, MT6059
Blue Sky Heights Wua ClancyClancy, MT25056
Wegner Water Service HaulerHardin, MT5055
Opheim, Town ofOpheim, MT11153
St. Ignatius, Town ofSt Ignatius, MT70039
Ryans LotMissoula, MT3438
Brady County Water Sewer DistrictBrady, MT14436
Flathead County Water District 101Columbia Falls, MT21035
Tamarack CourtMissoula, MT7534
Spring Tree RidgeGreat Falls, MT8033
Lambert Sewer and Water AssociationLambert, MT15032
Cinnabar, TheGardiner, MT17532
Libby, City ofLibby, MT4,47731
South Wind Water and Sewer DistrictGreat Falls, MT20031
Woods Bay Water and Sewer DistrictBigfork, MT68530
Hinsdale Water DepartmentHinsdale, MT25027
Elk Meadows RanchettesFrenchtown, MT17526
Nashua, Town ofNashua, MT30025
City of Great FallsGreat Falls, MT60,00025
Riverview ColonyChester, MT13025
Pinesdale, Town ofPinesdale, MT80025
Birch Creek ColonyValier, MT12024

Large utilities that accumulated/accrued the most violation points as of April 2016 to March 2019 in Montana

The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.

UtilityLocationPeople
Served
Violation
Points
City of Great FallsGreat Falls, MT60,00025
Butte-Silver Bow Water DepartmentButte, MT33,0005
Mountain Water CompanyMissoula, MT56,3353

Contaminants found in Montana above health guidelines

Found above health guidelinesFound
Contaminant# of UtilitiesPeople Served# of UtilitiesPeople Served

Total trihalomethanes (TTHMs)
263579,343260579,143

Bromodichloromethane
225543,755224563,713

Nitrate and nitrite
530537,366681701,711

Arsenic
293483,833284481,181

Chloroform
205459,712222562,111

Dibromochloromethane
205451,951206454,914

Dichloroacetic acid
165430,090173447,319

Trichloroacetic acid
145421,961150432,987

Radium, combined (-226 & -228)
486409,513492451,109

Chromium (hexavalent)
35343,91140384,446

Uranium
392341,295399359,102

Bromoform
7254,494104149,499

Nitrate
10736,35113849,662

Cadmium
331,759331,759

Chlorate
120,0088175,744

Thallium
21,98442,107

Barium
11,970277265,338

Manganese
61,89230103,815

Tetrachloroethylene (perchloroethylene)
25402540

Radon
13001300

Antimony
2128715,235

Di(2-ethylhexyl) phthalate
1531265,357

Beryllium
1403420

Contaminants found in Montana above legal limits