Tap and WellTreasure Valley water, from the public record

Fluoride in Treasure Valley drinking water

51 of 54 systems that tested for it in the last 36 months detected it; 1 are above the limit, elevated, or an aesthetic issue. Fluoride is an inorganic contaminant. Certified filters are in the list.

Most Treasure Valley systems do not add fluoride. Natural levels are usually below 1 mg/L; a few deep wells run higher.

SystemCounty36 mo maxLatestStatusLast sample
Veolia Water IdahoAda3.06ppm0.35ppmDetected2026-08-25
Sky Ranch EstatesCanyon2.40ppm2.40ppmElevated2025-06-25
Valley Hi EstatesBoise1.68ppm1.68ppmDetected2025-08-12
Bittercreek Meadows SubdivisionAda1.64ppm1.64ppmDetected2025-12-22
City of EmmettGem1.56ppm1.56ppmDetected2025-08-19
City of NampaCanyon1.34ppm1.34ppmDetected2024-03-19
City of GreenleafCanyon1.26ppmNDDetected2025-12-09
City of KunaAda1.13ppm1.13ppmDetected2026-01-26
Scriver Woods Homeowners AssociationBoise0.98ppm0.21ppmDetected2025-06-23
Edgemont SubdivisionGem0.84ppm0.84ppmDetected2025-12-05
Meridian Water DepartmentAda0.82ppm0.45ppmDetected2026-02-26
Oakleaf SubdivisionElmore0.77ppm0.77ppmDetected2025-11-11
City of ParmaCanyon0.72ppm0.72ppmDetected2025-09-09
Blue Sage SubdivisionElmore0.68ppm0.68ppmDetected2024-01-17
D and S Purple Sage RanchettesCanyon0.67ppm0.40ppmDetected2026-02-03
City of Glenns FerryElmore0.65ppm0.65ppmDetected2024-04-25
Sunnyridge I SubdivisionCanyon0.61ppm0.61ppmDetected2025-10-20
Stecher Mutual Water CompanyCanyon0.60ppm0.52ppmDetected2026-03-11
Camas Estates Water UsersElmore0.52ppm0.52ppmDetected2025-07-15
Lakeridge Second SubdivisionCanyon0.49ppm0.49ppmDetected2026-03-31
City of CaldwellCanyon0.46ppm0.40ppmDetected2025-06-23
City of Eagle (Western Zone)Ada0.46ppm0.46ppmDetected2025-04-29
Rustic Acres Mobile Home ParkAda0.46ppm0.46ppmDetected2025-12-31
Indian VillageCanyon0.46ppm0.46ppmDetected2025-12-02
Gem State AcademyCanyon0.46ppm0.46ppmDetected2025-11-13
Klugherz Water Corp.Ada0.44ppm0.44ppmDetected2025-03-24
Garden City Water and Sewer SystemAda0.43ppm0.43ppmDetected2023-11-01
M & T Water Corp.Canyon0.39ppm0.39ppmDetected2025-06-18
Maverick Subdivision Lasher ConstructionCanyon0.39ppm0.39ppmDetected2025-10-15
City of Mountain HomeElmore0.38ppm0.38ppmDetected2025-09-30
Star Sewer and Water District Water SystemAda0.35ppm0.35ppmDetected2025-08-07
Lakeys Cafe and Trailer ParkCanyon0.35ppm0.35ppmDetected2025-11-17
Hillsdale Estates Homeowners AssociationAda0.33ppm0.33ppmDetected2025-11-06
Sawtooth Estates Water UsersElmore0.32ppm0.21ppmDetected2025-05-06
Scottys Mobile Home ParkAda0.29ppm0.29ppmDetected2025-04-22
Mores Creek Rim Ranch Water DistrictBoise0.28ppm0.20ppmDetected2025-12-02
Grouse Point Water Company LLCAda0.26ppm0.26ppmDetected2025-12-04
Hi View WaterAda0.26ppm0.26ppmDetected2025-03-24
Trinity Estates Water Users AssociationElmore0.25ppm0.25ppmDetected2026-06-17
West Meadows EstatesAda0.23ppm0.23ppmDetected2025-08-12
Camelot Water Association Inc.Canyon0.23ppm0.23ppmDetected2025-11-24
Dry Creek Water Company LLCAda0.20ppm0.20ppmDetected2025-11-11
Country Club Subdivisions Water AssociationCanyon0.20ppm0.20ppmDetected2025-06-16
Willowbrook Estates Property OwnersAda0.19ppm0.19ppmDetected2025-11-19
Northside Estates HOA Inc.Canyon0.19ppm0.19ppmDetected2025-10-15
Desert View Estates Water Corp.Ada0.15ppm0.15ppmDetected2025-03-24
Arrowrock RanchAda0.14ppm0.14ppmDetected2025-12-04
Eagle MHCAda0.14ppm0.14ppmDetected2025-05-15
Belle Aire Acres 2Canyon0.11ppm0.11ppmDetected2025-09-23
Rolling Hills Estates Water CompanyCanyon0.11ppmNDDetected2025-04-21
Simplot Livestock Company GrandviewElmore0.10ppm0.10ppmDetected2025-11-04

Limits

Federal limit (MCL)
4 mg/L (4.00ppm)
Health goal (MCLG)
4.00ppm
Secondary (aesthetic) standard
2.00ppm
Some people who drink water containing fluoride in excess of the MCL over many years could get bone disease, including pain and tenderness of the bones. Children may get mottled teeth.EPA, quoted.

Removal methods in the reference list: reverse osmosis, activated alumina, distillation. A method name is not a product certification. Reverse osmosis is an optional preference if you want less fluoride.

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

826 groundwater zones in the region have confident (grade A or B) estimates for Fluoride. 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.