Tap and WellTreasure Valley water, from the public record

Barium in Treasure Valley drinking water

34 of 39 systems that tested for it in the last 36 months detected it. Barium is an inorganic contaminant. Certified filters are in the list.

SystemCounty36 mo maxLatestStatusLast sample
Indian VillageCanyon0.69ppm0.69ppmDetected2025-12-02
Shilo Ranch EstatesBoise0.27ppm0.27ppmDetected2025-10-27
Trinity Estates Water Users AssociationElmore0.19ppm0.12ppmDetected2026-06-17
Sawtooth Estates Water UsersElmore0.16ppm0.16ppmDetected2025-05-06
Rustic Acres Mobile Home ParkAda0.16ppm0.16ppmDetected2025-11-20
Scriver Woods Homeowners AssociationBoise0.15ppm0.10ppmDetected2025-06-23
Meridian Water DepartmentAda0.13ppm0.06ppmDetected2026-03-24
Pleasant View ManorCanyon0.12ppm0.12ppmDetected2025-12-10
City of Eagle (Eastern Zone)Ada0.11ppm0.11ppmDetected2025-03-21
Sunnyridge I SubdivisionCanyon0.11ppm0.11ppmDetected2025-10-20
Grouse Point Water Company LLCAda0.10ppm0.10ppmDetected2025-12-04
City of GreenleafCanyon0.10ppm0.10ppmDetected2025-12-09
Castle Mountain Creeks Owners AssociationBoise0.09ppm0.09ppmDetected2025-12-04
Camelot Water Association Inc.Canyon0.08ppm0.08ppmDetected2025-11-24
Veolia Water IdahoAda0.08ppmNDDetected2026-08-25
Lakeridge Second SubdivisionCanyon0.07ppm0.07ppmDetected2026-03-31
City of CaldwellCanyon0.07ppm0.07ppmDetected2025-06-23
Hi View WaterAda0.06ppm0.06ppmDetected2025-07-07
City of KunaAda0.06ppm0.04ppmDetected2026-01-26
M & T Water Corp.Canyon0.06ppm0.06ppmDetected2025-06-18
Star Sewer and Water District Water SystemAda0.05ppmNDDetected2025-08-07
City of ParmaCanyon0.05ppm0.05ppmDetected2025-09-09
City of Glenns FerryElmore0.04ppm0.04ppmDetected2024-04-25
Arrowrock RanchAda0.04ppm0.04ppmDetected2025-12-04
D and S Purple Sage RanchettesCanyon0.04ppm0.04ppmDetected2026-06-09
Country Club Subdivisions Water AssociationCanyon0.04ppm0.04ppmDetected2025-06-16
City of Eagle (Western Zone)Ada0.03ppm0.03ppmDetected2025-04-29
Simplot Livestock Company GrandviewElmore0.03ppm0.03ppmDetected2025-11-04
Bittercreek Meadows SubdivisionAda0.02ppm0.02ppmDetected2025-12-22
Mores Creek Rim Ranch Water DistrictBoise0.02ppm0.02ppmDetected2024-11-22
Garden City Water and Sewer SystemAda0.02ppm0.02ppmDetected2023-11-01
Rolling Hills Estates Water CompanyCanyon0.02ppm0.02ppmDetected2025-05-09
Rivers Point Property Owners AssociationBoise0.01ppm0.01ppmDetected2025-07-23
Edgemont SubdivisionGem0.01ppm0.01ppmDetected2025-12-05

Limits

Federal limit (MCL)
2 mg/L (2.00ppm)
Health goal (MCLG)
2.00ppm
Some people who drink water containing barium in excess of the MCL over many years could experience an increase in their blood pressure.EPA, quoted.

Removal methods in the reference list: ion-exchange softener, reverse osmosis. A method name is not a product certification.

By city: Barium in Boise City drinking water, Barium in Meridian drinking water, Barium in Eagle drinking water, Barium in Greenleaf drinking water, Barium in Garden City drinking water, Barium in Caldwell drinking water, Barium in Nampa drinking water, Barium in Kuna drinking water, Barium in Star drinking water, Barium in Parma drinking water, Barium in Glenns Ferry drinking water.

212 groundwater zones in the region have confident (grade A or B) estimates for Barium. See well estimates by ZIP.

Numbers are the system's samples at its taps and wells, not yours. Lead and copper are 90th percentiles from sampled homes. Well pages are nearby-sample estimates. Health text restates EPA and DEQ. Methodology.