Is Mountain Home, ID Tap Water Safe? Quality & Contaminants

What was found in Mountain Home's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	2000 µg/L 20% of the EPA limit 10000 µg/L Main supplier: MOUNTAIN HOME, CITY OF · 14,651 people · 2019 Highest in the city: 8100 µg/L — TRINITY ESTATES WATER USERS ASSN · 250 people · 2019	11/13	SYR4
Nitrate-Nitrite	2050 µg/L 21% of the EPA limit 10000 µg/L Main supplier: MOUNTAIN HOME, CITY OF · 14,651 people · 2018 Highest in the city: 5995 µg/L — TRINITY ESTATES WATER USERS ASSN · 250 people · 2019	10/13	SYR4
Fluoride	1705.5 µg/L 43% of the EPA limit 4000 µg/L Main supplier: MOUNTAIN HOME, CITY OF · 14,651 people · 2019	8/13	SYR4
Barium	140 µg/L 7% of the EPA limit 2000 µg/L Highest in the city: TRINITY ESTATES WATER USERS ASSN · 250 people · 2019	5/13	SYR4
TTHM	9.064 µg/L 11% of the EPA limit 80 µg/L Main supplier: MOUNTAIN HOME, CITY OF · 14,651 people · 2019 Highest in the city: 14.16 µg/L — TRINITY ESTATES WATER USERS ASSN · 250 people · 2019	5/13	SYR4
Total Haloacetic Acids (HAA5)	3.29 µg/L 5.5% of the EPA limit 60 µg/L Main supplier: MOUNTAIN HOME, CITY OF · 14,651 people · 2019 Highest in the city: 8.725 µg/L — SAWTOOTH ESTATES WATER USERS · 175 people · 2019	5/13	SYR4
Arsenic	6.15 µg/L 62% of the EPA limit 10 µg/L Main supplier: MOUNTAIN HOME, CITY OF · 14,651 people · 2019	6/13	SYR4
Chromium	4 µg/L 4% of the EPA limit 100 µg/L Main supplier: MOUNTAIN HOME, CITY OF · 14,651 people · 2019	7/13	SYR4
Combined Uranium	1.9 µg/L 6.3% of the EPA limit 30 µg/L Main supplier: MOUNTAIN HOME, CITY OF · 14,651 people · 2019 Highest in the city: 3.9 µg/L — SPLENDID ACRES WATER ASSN · 91 people · 2019	5/13	SYR4
Combined Radium (-226 And -228)	0.6445 pCi/L 13% of the EPA limit 5 pCi/L Main supplier: MOUNTAIN HOME, CITY OF · 14,651 people · 2018 Highest in the city: 2.0435 pCi/L — TOWN AND COUNTRY WATER USERS ASSN · 86 people · 2016	5/13	SYR4
Gross Alpha, Excl. Radon And U	1.8 pCi/L 12% of the EPA limit 15 pCi/L Highest in the city: SILVER SAGE REAL PROPERTY OWNERS ASSN · 30 people · 2012	1/13	SYR4
Bromoform	1.24 µg/L No EPA limit set Highest in the city: NEW HORIZONS WATER INC · 85 people · 2019	1/13	SYR4
Dibromoacetic Acid	1.24 µg/L No EPA limit set Highest in the city: NEW HORIZONS WATER INC · 85 people · 2019	1/13	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: MOUNTAIN HOME, CITY OF · 14,651 people · 2025 Highest in the city: 0.0070 mg/L — TRINITY ESTATES WATER USERS ASSN · 250 people · 2025	13/13	LCR

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Mountain Home

Supplier	Population served
MOUNTAIN HOME, CITY OF	14,651
MELLEN SUBD WATER DIST	250
TRINITY ESTATES WATER USERS ASSN	250
SUMMERWIND WATER USERS	192
SAWTOOTH ESTATES WATER USERS	175
BLUE SAGE SUBDIVISION	112
SPLENDID ACRES WATER ASSN	91
TOWN AND COUNTRY WATER USERS ASSN	86
NEW HORIZONS WATER INC	85
OAKLEAF SUBDIVISION	71
HAMMETT HAVEN APARTMENTS	64
CAMAS ESTATES WATER USERS	50
SILVER SAGE REAL PROPERTY OWNERS ASSN	30

Frequently asked questions about Mountain Home tap water

Is Mountain Home tap water safe to drink?

EPA testing detected 14 contaminants in the water serving Mountain Home. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Mountain Home?

13 public water suppliers report drinking-water monitoring for Mountain Home, Idaho to the EPA. Each is listed above with its population served.

What contaminants are in Mountain Home's water?

The contaminants EPA monitoring detected in Mountain Home include Nitrate, Nitrate-Nitrite, Fluoride, Barium, TTHM. The full list, with the level at the main supplier and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.