Tap and WellTreasure Valley water, from the public record

Sodium in Treasure Valley drinking water

144 of 145 systems that tested for it in the last 36 months detected it. Sodium is a secondary, aesthetic parameter. Certified filters are in the list.

Salt softeners add roughly 8 mg of sodium per grain of hardness removed per liter. A separate RO tap is the common fix for drinking water.

SystemCounty36 mo maxLatestStatusLast sample
City of Glenns FerryElmore484.00ppm67.90ppmDetected2026-01-14
Roswell Water Users Coop CompanyCanyon120.00ppm120.00ppmDetected2025-04-07
Purple Sage CommunityCanyon102.00ppm102.00ppmDetected2024-02-06
Meridian Water DepartmentAda100.00ppm97.00ppmDetected2026-03-24
Rich SubdivisionCanyon88.80ppm88.80ppmDetected2025-08-13
Woodview Acres Property OwnersCanyon87.80ppm87.80ppmDetected2025-12-11
Caldwell Housing AuthorityCanyon85.30ppm85.30ppmDetected2025-06-16
Sunlight TerraceCanyon85.20ppm65.90ppmDetected2025-09-17
Ok Water AssociationCanyon81.40ppm81.40ppmDetected2025-09-08
Grouse Point Water Company LLCAda79.30ppm79.30ppmDetected2025-12-04
Sky Ranch EstatesCanyon78.50ppm77.90ppmDetected2025-06-25
City of WilderCanyon75.20ppm75.20ppmDetected2025-05-07
Skyline Water AssociationCanyon73.50ppm73.50ppmDetected2025-09-23
Shalimar SubdivisionCanyon73.40ppm73.40ppmDetected2025-07-21
Bittercreek Meadows SubdivisionAda73.10ppm73.10ppmDetected2025-12-22
City of MelbaCanyon72.50ppm56.70ppmDetected2025-08-14
Lindenwood Water AssociationCanyon71.90ppm71.90ppmDetected2025-06-18
Stecher Mutual Water CompanyCanyon71.40ppm71.40ppmDetected2025-11-13
Maverick Subdivision Lasher ConstructionCanyon70.00ppm69.00ppmDetected2025-10-15
M & T Water Corp.Canyon69.50ppm69.50ppmDetected2025-06-18
Sunnyridge Property OwnersCanyon65.10ppm65.10ppmDetected2025-09-23
Covert Water Users AssociationCanyon64.00ppm61.00ppmDetected2025-10-20
Karcher Ranchette Water Corp.Canyon63.60ppm63.60ppmDetected2025-11-24
Sunnyridge 3 Water Corp.Canyon62.00ppm62.00ppmDetected2025-12-16
Lakeridge Second SubdivisionCanyon62.00ppm62.00ppmDetected2025-08-13
M and M Mountain View Subdivision Em2Canyon60.40ppm60.40ppmDetected2024-03-04
Verde Hills Water Users Association Inc.Canyon60.30ppm60.30ppmDetected2025-04-22
Sunnyridge Subdivision 2Canyon60.20ppm60.20ppmDetected2025-12-16
IDOC Idaho State Correctional CenterAda60.00ppm60.00ppmDetected2025-08-19
D and S Purple Sage RanchettesCanyon60.00ppm23.00ppmDetected2026-02-03
Gem State AcademyCanyon59.90ppm59.90ppmDetected2025-11-13
City of Eagle (Eastern Zone)Ada59.70ppm59.70ppmDetected2025-03-21
City of GreenleafCanyon59.20ppm36.70ppmDetected2025-12-09
Veolia Water IdahoAda59.00ppm28.00ppmDetected2025-12-31
City of CaldwellCanyon58.70ppm32.10ppmDetected2025-08-20
City of NampaCanyon58.20ppm48.10ppmDetected2024-11-14
Belle Aire Acres 2Canyon57.30ppm57.30ppmDetected2025-09-23
Camelot Water Association Inc.Canyon53.90ppm53.90ppmDetected2025-11-24
Capitol Water Corp.Ada52.60ppmNDDetected2025-11-13
City of KunaAda52.20ppm52.20ppmDetected2025-01-09
City of ParmaCanyon49.80ppm38.60ppmDetected2025-09-09
Rolling Hills Estates Water CompanyCanyon49.30ppm40.00ppmDetected2025-05-09
Lakeview Hills Water Users AssociationCanyon48.10ppm48.10ppmDetected2025-12-02
Westview Shervik SubdivisionCanyon47.90ppm47.90ppmDetected2025-07-21
Country Meadows SubdivisionCanyon47.20ppm47.20ppmDetected2025-11-18
Stecher Water Users AssociationCanyon46.50ppm46.50ppmDetected2025-10-13
Linda Vista Mobile Home ParkAda46.30ppm46.30ppmDetected2025-04-08
Bonnie Laura SubdivisionGem46.30ppm46.30ppmDetected2025-11-10
Paradise Estates Water Corp.Ada45.70ppm45.70ppmDetected2025-12-10
Malad and Hilton Water Company Inc.Ada45.50ppm45.50ppmDetected2025-06-26
Eagle West Subdivision Water AssociationAda44.80ppm44.80ppmDetected2025-04-22
Twin Bridges SubdivisionCanyon44.60ppm44.60ppmDetected2025-12-02
Apache Heights Subdivision (2)Canyon43.70ppm43.70ppmDetected2025-12-02
West Meadows EstatesAda43.40ppm43.40ppmDetected2025-08-12
Forrey HeightsAda43.30ppm43.30ppmDetected2025-11-13
Lakeview Water Company 1Canyon43.00ppm43.00ppmDetected2025-06-05
Locust SubdivisionCanyon42.90ppm42.90ppmDetected2025-12-02
Hi View WaterAda42.50ppm42.50ppmDetected2025-05-07
Evergreen Mobile ParkCanyon42.10ppm42.10ppmDetected2025-12-03
Burnie SubdivisionCanyon42.10ppm42.10ppmDetected2025-11-05
Rustic Acres Mobile Home ParkAda41.90ppm41.90ppmDetected2025-11-20
Arrowrock RanchAda41.20ppm41.20ppmDetected2025-12-04
Flying H Trailer RanchAda39.60ppm37.10ppmDetected2025-04-08
Eagle Point CommunityAda39.50ppm39.50ppmDetected2025-11-20
Silver Spur SubdivisionCanyon38.80ppm38.80ppmDetected2025-05-20
Valley Hi EstatesBoise38.20ppm38.20ppmDetected2025-08-12
Valley View WaterCanyon38.00ppm38.00ppmDetected2025-02-12
Clark Theurer Water AssociationCanyon37.60ppm37.60ppmDetected2025-05-19
Owyhee Village Subdivision Water Association Inc.Canyon37.20ppm37.20ppmDetected2025-11-05
Pleasant View ManorCanyon37.00ppm37.00ppmDetected2025-12-10
Somerset West Water Corp.Canyon36.80ppm36.80ppmDetected2025-11-24
Evans Water Corp.Ada36.00ppm36.00ppmDetected2025-03-04
Trinity Estates Water Users AssociationElmore35.90ppm35.90ppmDetected2025-05-06
City of EmmettGem35.80ppm35.80ppmDetected2025-08-19
Vanal Heights Sweet WaterCanyon35.80ppm35.80ppmDetected2025-12-29
IDOC SBX ComplexAda35.00ppm35.00ppmDetected2025-08-05
Picket Corral Owners AssociationGem34.80ppm34.80ppmDetected2025-11-10
Shamrock Villa Water AssociationCanyon34.50ppm34.50ppmDetected2025-10-07
Indian VillageCanyon33.60ppm33.50ppmDetected2025-12-30
Sawtooth Estates Water UsersElmore33.30ppm33.30ppmDetected2025-05-06
Leisure Heights Homeowners AssociationCanyon33.00ppm33.00ppmDetected2025-11-17
Dahl SubdivisionCanyon31.90ppm31.90ppmDetected2025-12-11
Anderson Circle Water Corp.Ada31.40ppm31.40ppmDetected2025-06-26
Willowbrook Estates Property OwnersAda30.50ppm30.50ppmDetected2025-11-25
Hamilton PlaceElmore30.50ppm30.50ppmDetected2025-11-11
Horseshu Vue Ranch SubdivisionBoise29.90ppm29.90ppmDetected2025-12-16
Northside Estates HOA Inc.Canyon29.40ppm29.40ppmDetected2025-10-15
Pleasant Acres Mobile Home ParkElmore28.10ppm28.10ppmDetected2025-11-11
Star Sewer and Water District Water SystemAda27.50ppm15.70ppmDetected2025-08-07
Canyon Creek Mobile Home ParkElmore27.20ppm23.70ppmDetected2025-11-04
Boise Holcomb Water Users Assoc. Inc.Boise26.60ppm26.60ppmDetected2025-10-29
Vanal Heights Well AssociationCanyon26.00ppm26.00ppmDetected2025-03-14
Terrace Lakes Water CompanyBoise25.00ppm25.00ppmDetected2025-09-25
New Horizons Water Inc.Elmore25.00ppm25.00ppmDetected2025-08-20
Garden City Water and Sewer SystemAda24.90ppm17.70ppmDetected2025-09-04
City of NotusCanyon24.40ppm24.40ppmDetected2025-06-26
Town and Country Water Users AssociationElmore24.00ppm24.00ppmDetected2025-12-15
El Rancho HeightsCanyon22.90ppm22.90ppmDetected2025-11-24
Klugherz Water Corp.Ada22.80ppm22.80ppmDetected2025-05-07
Northridge Estates Water AssociationCanyon22.70ppm22.70ppmDetected2025-04-22
Christis Mobile ParkCanyon22.40ppm22.40ppmDetected2025-11-05
Eagle Glen Homeowners Association Inc.Ada22.10ppm22.10ppmDetected2025-05-15
Par Estates Homeowners AssociationCanyon22.10ppm22.10ppmDetected2025-12-18
Amy Trailer ParkAda21.60ppm21.60ppmDetected2025-10-22
Scottys Mobile Home ParkAda21.50ppm12.90ppmDetected2025-04-22
Chaparral Water AssociationAda20.90ppm20.90ppmDetected2025-05-15
Oakleaf SubdivisionElmore20.50ppm20.50ppmDetected2025-11-11
Sierra Water Corp.Ada20.30ppm20.30ppmDetected2025-04-28
Riley Trailer ParkAda20.10ppm20.10ppmDetected2025-08-13
Eagle MHCAda19.60ppm19.60ppmDetected2025-05-15
Decoy Inn and RV ParkCanyon19.00ppm19.00ppmDetected2025-05-07
Castle Mountain Creeks Owners AssociationBoise18.90ppm8.31ppmDetected2026-07-22
Blue Sage SubdivisionElmore18.90ppm18.90ppmDetected2025-10-28
Krizview ParkAda18.80ppm18.80ppmDetected2025-04-08
Camas Estates Water UsersElmore17.90ppm17.90ppmDetected2025-05-06
City of Mountain HomeElmore17.70ppm16.40ppmDetected2025-09-30
City of Eagle (Western Zone)Ada17.60ppm17.60ppmDetected2025-04-29
Wymosa Water Association Inc.Ada17.60ppm12.50ppmDetected2025-11-19
Scriver Woods Homeowners AssociationBoise17.40ppm17.40ppmDetected2026-06-16
Terrace Water Corp. Inc.Ada17.00ppm17.00ppmDetected2025-11-20
Dry Creek Water Company LLCAda15.40ppm11.80ppmDetected2025-11-11
Rivers Point Property Owners AssociationBoise15.40ppm4.76ppmDetected2026-06-14
H and L ParkCanyon15.10ppm15.10ppmDetected2025-11-17
Lakeys Cafe and Trailer ParkCanyon14.30ppm14.30ppmDetected2025-11-17
Duquette Pines Homeowners AssociationBoise14.00ppm14.00ppmDetected2025-08-08
Silver Sage Real Property Owners AssociationElmore14.00ppm14.00ppmDetected2025-07-15
Meadows Mobile ParkElmore13.50ppm13.50ppmDetected2025-10-28
City of MiddletonCanyon13.00ppm8.87ppmDetected2025-04-30
Lansing MeadowsCanyon12.80ppm12.80ppmDetected2025-11-18
Danskin Properties Association Inc.Elmore12.80ppm12.80ppmDetected2025-10-29
Stanley Pond Inc.Ada12.20ppm12.20ppmDetected2025-06-26
Wildrose EstatesCanyon12.10ppm12.10ppmDetected2025-10-14
Country Club Subdivisions Water AssociationCanyon10.90ppm10.90ppmDetected2025-06-16
Island Village Mobile Home ParkAda10.90ppm10.90ppmDetected2025-05-15
Dell Subdivision Water AssociationAda10.20ppm10.20ppmDetected2025-05-15
Mountain SageElmore10.10ppm10.10ppmDetected2025-04-29
Shilo Ranch EstatesBoise10.00ppm10.00ppmDetected2025-10-27
Horseshoe Bend Water SupplyBoise9.94ppm9.94ppmDetected2025-09-17
Rivervine SubdivisionAda9.73ppm9.73ppmDetected2025-12-22
Idaho City Water DepartmentBoise9.30ppm5.30ppmDetected2025-11-19
Wilderness Ranch Owners Association Inc.Boise8.80ppm8.30ppmDetected2025-09-10
Mores Creek Rim Ranch Water DistrictBoise8.10ppm8.10ppmDetected2024-11-22
OspreyBoise7.30ppm7.30ppmDetected2025-12-02
Atlanta Water AssociationElmore2.10ppm2.00ppmDetected2025-09-09

Limits

Health guideline
20 mg/L (20.00ppm) (EPA drinking water advisory for individuals on a 500 mg/day restricted sodium diet)
Regulated
No federal MCL or action level on file
Sodium is not regulated. EPA has a guidance level of 20 mg/L for people on very low sodium diets.Agency language as recorded in the contaminant reference.

Removal methods in the reference list: reverse osmosis, distillation. A method name is not a product certification.

By city: Sodium in Glenns Ferry drinking water, Sodium in Boise City drinking water, Sodium in Meridian drinking water, Sodium in Caldwell drinking water, Sodium in Wilder drinking water, Sodium in Eagle drinking water, Sodium in Greenleaf drinking water, Sodium in Garden City drinking water, Sodium in Nampa drinking water, Sodium in Kuna drinking water, Sodium in Parma drinking water, Sodium in Emmett drinking water, Sodium in Star drinking water, Sodium in Notus drinking water, Sodium in Mountain Home drinking water, Sodium in Middleton drinking water, Sodium in Horseshoe Bend drinking water, Sodium in Idaho City drinking water, Sodium in Robie Creek drinking water.

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