Tap and WellTreasure Valley water, from the public record

Nitrate (as N) in Treasure Valley drinking water

134 of 154 systems that tested for it in the last 36 months detected it; 43 are above the limit, elevated, or an aesthetic issue. Nitrate (as N) is an inorganic contaminant. Certified filters are in the list.

Idaho DEQ has designated Nitrate Priority Areas across the Treasure Valley, including parts of Canyon County and southwest Ada County. Private wells in irrigated agricultural areas are the main concern.

SystemCounty36 mo maxLatestStatusLast sample
Mountain Home Air Force BaseElmore18.40ppm11.40ppmAbove limit2026-06-25
Canyon Creek Mobile Home ParkElmore13.20ppm2.50ppmAbove limit2026-09-08
Drake SubdivisionCanyon12.20ppm12.20ppmAbove limit2025-12-26
D and S Purple Sage RanchettesCanyon12.00ppm9.54ppmAbove limit2026-07-21
Woodview Acres Property OwnersCanyon11.40ppm2.60ppmAbove limit2026-06-29
Purple Sage CommunityCanyon10.10ppm8.40ppmAbove limit2026-01-06
Sunnyridge I SubdivisionCanyon10.10ppmNDAbove limit2026-06-16
Maverick Subdivision Lasher ConstructionCanyon9.69ppm3.57ppmElevated2026-04-08
Leisure Heights Homeowners AssociationCanyon9.40ppm3.50ppmElevated2025-11-17
City of MelbaCanyon8.50ppm8.20ppmElevated2026-08-03
Trinity Estates Water Users AssociationElmore8.50ppm7.10ppmElevated2026-08-20
Apache Heights Subdivision (2)Canyon8.00ppm8.00ppmElevated2026-06-09
Sawtooth Estates Water UsersElmore7.90ppm4.80ppmElevated2026-08-20
Locust SubdivisionCanyon7.80ppm7.80ppmElevated2026-06-09
Town and Country Water Users AssociationElmore7.73ppm6.53ppmElevated2026-07-06
Valley View WaterCanyon7.34ppm6.78ppmElevated2026-07-24
Gem State AcademyCanyon6.90ppm3.00ppmElevated2026-01-21
Sunlight TerraceCanyon6.60ppm5.90ppmElevated2026-08-19
Rich SubdivisionCanyon6.60ppm6.60ppmElevated2026-03-11
Sunnyridge Subdivision 2Canyon6.60ppm6.10ppmElevated2025-09-16
Veolia Water IdahoAda6.50ppm0.90ppmElevated2026-08-27
M & T Water Corp.Canyon6.40ppm6.10ppmElevated2026-04-10
City of NampaCanyon6.30ppm6.00ppmElevated2026-08-19
Karcher Ranchette Water Corp.Canyon6.20ppm5.30ppmElevated2025-11-24
City of Glenns FerryElmore6.10ppm4.30ppmElevated2026-07-21
Simplot Livestock Company GrandviewElmore6.10ppm1.30ppmElevated2026-09-01
Wilderness Ranch Owners Association Inc.Boise6.08ppm1.28ppmElevated2026-04-07
Greenhills Estates 3Ada6.00ppm6.00ppmElevated2026-02-23
Sunnyridge 3 Water Corp.Canyon5.80ppm5.70ppmElevated2026-06-08
Country Meadows SubdivisionCanyon5.80ppm5.50ppmElevated2025-11-18
Grouse Point Water Company LLCAda5.70ppmNDElevated2025-12-04
Meridian Water DepartmentAda5.60ppm0.80ppmElevated2026-06-24
Belle Aire Acres 2Canyon5.60ppm5.50ppmElevated2026-02-23
Caldwell Housing AuthorityCanyon5.50ppm4.90ppmElevated2025-06-16
Hamilton PlaceElmore5.50ppm5.50ppmElevated2026-01-20
M and M Mountain View Subdivision Em2Canyon5.50ppm5.10ppmElevated2026-08-19
Pleasant Acres Mobile Home ParkElmore5.30ppm4.20ppmElevated2026-01-20
Hammett Haven ApartmentsElmore5.30ppm5.30ppmElevated2023-10-31
Lakeridge Second SubdivisionCanyon5.25ppm4.78ppmElevated2025-08-13
Indian VillageCanyon5.10ppm5.00ppmElevated2025-12-02
Sunnyridge Property OwnersCanyon5.10ppm5.10ppmElevated2026-06-11
New Horizons Water Inc.Elmore5.01ppm4.73ppmElevated2025-08-20
City of KunaAda5.00ppmNDElevated2026-08-13
City of Eagle (Eastern Zone)Ada4.60ppm3.40ppmDetected2026-01-21
Paradise Estates Water Corp.Ada4.40ppm4.20ppmDetected2025-12-10
Riley Trailer ParkAda4.30ppm4.30ppmDetected2026-04-07
Rolling Hills Estates Water CompanyCanyon4.20ppmNDDetected2025-07-14
Horseshu Vue Ranch SubdivisionBoise4.20ppm3.70ppmDetected2025-12-16
Capitol Water Corp.Ada4.10ppmNDDetected2026-07-14
Dry Creek Water Company LLCAda4.10ppm1.50ppmDetected2025-11-11
Desert View Estates Water Corp.Ada4.10ppm4.10ppmDetected2026-06-22
Ok Water AssociationCanyon4.10ppm3.90ppmDetected2026-05-06
Rivervine SubdivisionAda4.10ppmNDDetected2025-12-22
Shamrock Villa Water AssociationCanyon4.00ppm3.90ppmDetected2025-10-07
Lindenwood Water AssociationCanyon4.00ppm2.90ppmDetected2026-04-14
Eagle West Subdivision Water AssociationAda3.90ppm3.20ppmDetected2026-03-24
Malad and Hilton Water Company Inc.Ada3.90ppm3.90ppmDetected2026-02-26
Linda Vista Mobile Home ParkAda3.70ppm3.70ppmDetected2026-03-10
Stecher Mutual Water CompanyCanyon3.70ppm3.00ppmDetected2026-01-14
IDOC Idaho State Correctional CenterAda3.50ppm2.62ppmDetected2025-08-19
Twin Bridges SubdivisionCanyon3.50ppm3.50ppmDetected2025-12-02
Westview Shervik SubdivisionCanyon3.40ppm3.40ppmDetected2026-02-23
IDOC SBX ComplexAda3.31ppm3.31ppmDetected2026-08-25
Clark Theurer Water AssociationCanyon3.20ppm3.20ppmDetected2026-06-29
Verde Hills Water Users Association Inc.Canyon3.10ppm1.80ppmDetected2026-02-23
Picket Corral Owners AssociationGem3.10ppm2.90ppmDetected2025-11-10
Covert Water Users AssociationCanyon3.03ppm1.00ppmDetected2026-05-15
Camelot Water Association Inc.Canyon3.00ppm2.90ppmDetected2025-11-24
Skyline Water AssociationCanyon3.00ppm2.90ppmDetected2026-04-14
Arrowrock RanchAda2.90ppm2.30ppmDetected2025-12-04
Anderson Circle Water Corp.Ada2.90ppm2.70ppmDetected2026-07-30
Silver Sage Real Property Owners AssociationElmore2.87ppm2.25ppmDetected2025-07-15
Summerwind Water UsersElmore2.70ppm1.30ppmDetected2026-05-12
Willowbrook Estates Property OwnersAda2.70ppm1.10ppmDetected2025-11-25
Evans Water Corp.Ada2.60ppm0.90ppmDetected2025-03-04
Northridge Estates Water AssociationCanyon2.50ppm2.50ppmDetected2026-03-11
City of Mountain HomeElmore2.40ppm0.90ppmDetected2026-08-26
Sierra Water Corp.Ada2.40ppm2.30ppmDetected2026-06-15
City of CaldwellCanyon2.30ppm0.30ppmDetected2026-04-15
Eagle MHCAda2.20ppm2.20ppmDetected2026-04-16
Featherville Townsite Water Corp.Elmore2.20ppmNDDetected2026-03-15
Wymosa Water Association Inc.Ada2.10ppm1.80ppmDetected2025-11-19
Amy Trailer ParkAda2.10ppm2.10ppmDetected2026-03-02
Silver Spur SubdivisionCanyon2.10ppm1.80ppmDetected2025-12-22
Flying H Trailer RanchAda2.00ppm1.90ppmDetected2026-03-10
Shalimar SubdivisionCanyon2.00ppm2.00ppmDetected2026-04-10
Krizview ParkAda1.80ppm1.60ppmDetected2026-03-10
Oakleaf SubdivisionElmore1.80ppm1.80ppmDetected2026-01-13
Hi View WaterAda1.80ppm1.80ppmDetected2025-05-07
Terrace Water Corp. Inc.Ada1.70ppm1.40ppmDetected2025-11-20
Mores Creek Rim Ranch Water DistrictBoise1.64ppm1.64ppmDetected2025-12-02
OspreyBoise1.64ppm1.64ppmDetected2025-12-02
Lakeview Hills Water Users AssociationCanyon1.60ppm1.60ppmDetected2025-12-02
Dahl SubdivisionCanyon1.60ppm1.60ppmDetected2025-12-11
Duquette Pines Homeowners AssociationBoise1.54ppm0.41ppmDetected2026-08-12
Star Sewer and Water District Water SystemAda1.50ppmNDDetected2026-09-08
Scottys Mobile Home ParkAda1.50ppm1.00ppmDetected2026-04-16
Forrey HeightsAda1.40ppm1.40ppmDetected2026-01-14
Lansing MeadowsCanyon1.30ppm1.00ppmDetected2025-11-18
Owyhee Village Subdivision Water Association Inc.Canyon1.30ppm1.30ppmDetected2026-01-14
Rivers Point Property Owners AssociationBoise1.20ppmNDDetected2026-06-14
Northside Estates HOA Inc.Canyon1.20ppm1.20ppmDetected2026-02-09
Mountain SageElmore1.20ppm1.10ppmDetected2026-01-06
West Meadows EstatesAda1.10ppm1.10ppmDetected2026-05-14
Eagle Point CommunityAda1.10ppm0.90ppmDetected2026-03-24
Par Estates Homeowners AssociationCanyon1.10ppm1.10ppmDetected2025-12-18
Burnie SubdivisionCanyon1.10ppm1.00ppmDetected2026-01-14
Camas Estates Water UsersElmore1.10ppm1.10ppmDetected2026-06-17
Chaparral Water AssociationAda1.00ppm0.90ppmDetected2026-04-16
Meadows Mobile ParkElmore0.90ppm0.90ppmDetected2026-01-06
Island Village Mobile Home ParkAda0.90ppm0.90ppmDetected2026-03-24
Blue Sage SubdivisionElmore0.70ppm0.70ppmDetected2026-01-20
City of MiddletonCanyon0.60ppm0.60ppmDetected2026-01-12
Rustic Acres Mobile Home ParkAda0.60ppmNDDetected2025-11-20
Lakeys Cafe and Trailer ParkCanyon0.60ppm0.60ppmDetected2026-02-09
Christis Mobile ParkCanyon0.60ppm0.60ppmDetected2026-01-14
H and L ParkCanyon0.60ppm0.60ppmDetected2026-02-09
Garden City Water and Sewer SystemAda0.50ppmNDDetected2026-06-16
Eagle Glen Homeowners Association Inc.Ada0.50ppm0.30ppmDetected2026-03-24
Stanley Pond Inc.Ada0.50ppm0.50ppmDetected2026-02-26
Vanal Heights Sweet WaterCanyon0.50ppm0.40ppmDetected2025-12-29
Pleasant View ManorCanyon0.48ppm0.48ppmDetected2026-05-20
Shilo Ranch EstatesBoise0.40ppmNDDetected2026-05-11
Evergreen Mobile ParkCanyon0.30ppm0.30ppmDetected2026-01-14
Castle Mountain Creeks Owners AssociationBoise0.30ppmNDDetected2026-07-22
Danskin Properties Association Inc.Elmore0.30ppm0.30ppmDetected2026-01-07
Vanal Heights Well AssociationCanyon0.21ppmNDDetected2026-01-12
City of NotusCanyon0.20ppm0.20ppmDetected2026-04-22
Somerset West Water Corp.Canyon0.20ppmNDDetected2025-11-24
Klugherz Water Corp.Ada0.20ppm0.20ppmDetected2026-06-22
Country Club Subdivisions Water AssociationCanyon0.20ppm0.20ppmDetected2026-03-11
Stecher Water Users AssociationCanyon0.20ppm0.20ppmDetected2026-06-16
Lakeview Water Company 1Canyon0.17ppm0.14ppmDetected2025-06-05
Idaho City Water DepartmentBoise0.05ppm0.04ppmDetected2025-11-19

Limits

Federal limit (MCL)
10 mg/L (10.00ppm)
Health goal (MCLG)
10.00ppm
Infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome.EPA, quoted. For infants and pregnancy, read the agency text as written.

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

By city: Nitrate (as N) in Mountain Home drinking water, Nitrate (as N) in Mountain Home AFB drinking water, Nitrate (as N) in Nampa drinking water, Nitrate (as N) in Boise City drinking water, Nitrate (as N) in Garden City drinking water, Nitrate (as N) in Meridian drinking water, Nitrate (as N) in Glenns Ferry drinking water, Nitrate (as N) in Robie Creek drinking water, Nitrate (as N) in Wilder drinking water, Nitrate (as N) in Caldwell drinking water, Nitrate (as N) in Kuna drinking water, Nitrate (as N) in Eagle drinking water, Nitrate (as N) in Star drinking water, Nitrate (as N) in Middleton drinking water, Nitrate (as N) in Notus drinking water, Nitrate (as N) in Idaho City drinking water.

833 groundwater zones in the region have confident (grade A or B) estimates for Nitrate (as N). 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.