Tap and WellTreasure Valley water, from the public record

Iron in Treasure Valley drinking water

7 of 7 systems that tested for it in the last 36 months detected it; 3 are above the limit, elevated, or an aesthetic issue. Iron is a secondary, aesthetic parameter. Certified filters are in the list.

Common in shallow Treasure Valley wells. Clear-water iron can be handled by a softener up to roughly 3 mg/L; above that an iron filter belongs first in line.

SystemCounty36 mo maxLatestStatusLast sample
Veolia Water IdahoAda2.85ppmNDAesthetic issue2026-08-25
Terrace Lakes Water CompanyBoise2.63ppm2.63ppmAesthetic issue2025-08-20
Garden City Water and Sewer SystemAda0.92ppmNDAesthetic issue2026-01-15
Dry Creek Water Company LLCAda0.16ppm0.16ppmDetected2023-09-29
Hillsdale Estates Homeowners AssociationAda0.15ppm0.15ppmDetected2025-11-06
Star Sewer and Water District Water SystemAda0.10ppm0.10ppmDetected2023-12-06
Meridian Water DepartmentAda0.02ppmNDDetected2026-03-24

Limits

Secondary (aesthetic) standard
0.3 mg/L (0.30ppm)
Iron is a secondary (aesthetic) standard. Above 0.3 mg/L it causes rusty color, sediment, metallic taste, and staining of fixtures and laundry.Agency language as recorded in the contaminant reference.

Removal methods in the reference list: oxidation filtration, manganese greensand, ion-exchange softener, sediment filtration. A method name is not a product certification.

By city: Iron in Boise City drinking water, Iron in Garden City drinking water, Iron in Meridian drinking water, Iron in Eagle drinking water, Iron in Star drinking water.

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