Tap and WellTreasure Valley water, from the public record

Radium 226 + 228 in Treasure Valley drinking water

37 of 128 systems that tested for it in the last 36 months detected it; 1 are above the limit, elevated, or an aesthetic issue. Radium 226 + 228 is a naturally radioactive element. Certified filters are in the list.

SystemCounty36 mo maxLatestStatusLast sample
Grouse Point Water Company LLCAda2.61pCi/L2.61pCi/LElevated2025-12-04
Meridian Water DepartmentAda2.47pCi/L0.57pCi/LDetected2026-03-24
Veolia Water IdahoAda1.94pCi/LNDDetected2026-07-28
City of GreenleafCanyon1.90pCi/L1.90pCi/LDetected2025-12-09
Canyon Creek Mobile Home ParkElmore1.73pCi/LNDDetected2025-11-04
City of KunaAda1.65pCi/L1.65pCi/LDetected2026-06-10
Owyhee Village Subdivision Water Association Inc.Canyon1.54pCi/L1.54pCi/LDetected2025-11-05
Country Meadows SubdivisionCanyon1.48pCi/L1.48pCi/LDetected2025-11-18
Sierra Water Corp.Ada1.46pCi/L1.46pCi/LDetected2025-04-28
Burnie SubdivisionCanyon1.46pCi/L1.46pCi/LDetected2025-11-05
Garden City Water and Sewer SystemAda1.36pCi/LNDDetected2025-09-04
Silver Sage Real Property Owners AssociationElmore1.34pCi/L1.34pCi/LDetected2025-05-20
Scottys Mobile Home ParkAda1.31pCi/LNDDetected2026-07-16
Christis Mobile ParkCanyon1.28pCi/L1.28pCi/LDetected2025-11-05
City of Mountain HomeElmore1.19pCi/LNDDetected2025-09-30
City of ParmaCanyon1.05pCi/LNDDetected2025-09-09
Boise Holcomb Water Users Assoc. Inc.Boise1.03pCi/L1.03pCi/LDetected2025-10-29
Duquette Pines Homeowners AssociationBoise0.87pCi/L0.87pCi/LDetected2025-08-08
Sunnyridge I SubdivisionCanyon0.80pCi/L0.76pCi/LDetected2025-10-20
Idaho City Water DepartmentBoise0.76pCi/L0.47pCi/LDetected2025-11-19
Lakeridge Second SubdivisionCanyon0.71pCi/L0.71pCi/LDetected2025-08-15
Pleasant View ManorCanyon0.68pCi/L0.68pCi/LDetected2025-09-10
Lakeview Water Company 1Canyon0.54pCi/L0.20pCi/LDetected2025-10-28
Covert Water Users AssociationCanyon0.54pCi/LNDDetected2025-10-20
Decoy Inn and RV ParkCanyon0.53pCi/L0.53pCi/LDetected2025-01-10
D and S Purple Sage RanchettesCanyon0.48pCi/L0.48pCi/LDetected2025-05-02
Valley View WaterCanyon0.42pCi/L0.42pCi/LDetected2025-02-12
Maverick Subdivision Lasher ConstructionCanyon0.32pCi/LNDDetected2025-10-15
OspreyBoise0.22pCi/L0.18pCi/LDetected2025-12-02
IDOC SBX ComplexAda0.18pCi/L0.04pCi/LDetected2025-08-05
IDOC Idaho State Correctional CenterAda0.18pCi/L0.18pCi/LDetected2025-08-19
Oakleaf SubdivisionElmore0.00pCi/L0.00pCi/LDetected2025-11-11
Danskin Properties Association Inc.Elmore0.00pCi/L0.00pCi/LDetected2025-10-29
Horseshu Vue Ranch SubdivisionBoise0.00pCi/L0.00pCi/LDetected2025-12-16
Forrey HeightsAda0.00pCi/L0.00pCi/LDetected2025-11-13
Amy Trailer ParkAda0.00pCi/L0.00pCi/LDetected2025-10-22
Riley Trailer ParkAda0.00pCi/L0.00pCi/LDetected2025-08-13

Limits

Federal limit (MCL)
5.00pCi/L
Health goal (MCLG)
0.00pCi/L
Some people who drink water containing radium 226 or 228 in excess of the MCL over many years may have an increased risk of getting cancer.EPA, quoted.

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

By city: Radium 226 + 228 in Boise City drinking water, Radium 226 + 228 in Meridian drinking water, Radium 226 + 228 in Garden City drinking water, Radium 226 + 228 in Greenleaf drinking water, Radium 226 + 228 in Kuna drinking water, Radium 226 + 228 in Mountain Home drinking water, Radium 226 + 228 in Parma drinking water, Radium 226 + 228 in Idaho City drinking water, Radium 226 + 228 in Nampa drinking water.

Not enough groundwater samples in the region to estimate Radium 226 + 228 in private wells. A lab test is the only way to know.

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.