Manganese in Treasure Valley drinking water
8 of 15 systems that tested for it in the last 36 months detected it; 5 are above the limit, elevated, or an aesthetic issue. Manganese is a secondary, aesthetic parameter. Certified filters are in the list.
Often occurs with iron in valley wells. Certified manganese claims are uncommon.
| System | County | 36 mo max | Latest | Status | Last sample |
|---|---|---|---|---|---|
| Veolia Water Idaho | Ada | 537.0ppb | 432.0ppb | Aesthetic issue | 2026-08-25 |
| Garden City Water and Sewer System | Ada | 247.0ppb | 233.0ppb | Aesthetic issue | 2026-01-15 |
| Hillsdale Estates Homeowners Association | Ada | 212.0ppb | 212.0ppb | Aesthetic issue | 2025-11-06 |
| Terrace Lakes Water Company | Boise | 127.0ppb | 127.0ppb | Aesthetic issue | 2025-08-20 |
| Rolling Hills Estates Water Company | Canyon | 75.0ppb | ND | Aesthetic issue | 2025-03-24 |
| Klugherz Water Corp. | Ada | 45.0ppb | 45.0ppb | Detected | 2025-03-24 |
| Star Sewer and Water District Water System | Ada | 31.0ppb | 31.0ppb | Detected | 2023-12-06 |
| Boise Holcomb Water Users Assoc. Inc. | Boise | 19.0ppb | 19.0ppb | Detected | 2025-04-02 |
Limits
- Secondary (aesthetic) standard
- 0.05 mg/L (50.0ppb)
- Health guideline
- 300.0ppb (EPA lifetime health advisory)
Manganese is a secondary standard at 0.05 mg/L for black staining and taste. EPA has a lifetime health advisory of 0.3 mg/L; infants are more sensitive.Agency language as recorded in the contaminant reference.
Removal methods in the reference list: oxidation filtration, manganese greensand, ion-exchange softener. A method name is not a product certification.
By city: Manganese in Boise City drinking water, Manganese in Garden City drinking water, Manganese in Meridian drinking water, Manganese in Star drinking water.
704 groundwater zones in the region have confident (grade A or B) estimates for Manganese. 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.