Is Grangeville, ID Tap Water Safe? Quality & Contaminants

What was found in Grangeville'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	2390 µg/L 24% of the EPA limit 10000 µg/L Main supplier: GRANGEVILLE WATER DEPT · 3,151 people · 2019 Highest in the city: 3310 µg/L — COUNTRY COURT COMMUNITY · 89 people · 2019	2/2	SYR4
Nitrate-Nitrite	3310 µg/L 33% of the EPA limit 10000 µg/L Highest in the city: COUNTRY COURT COMMUNITY · 89 people · 2019	1/2	SYR4
Fluoride	491.1 µg/L 12% of the EPA limit 4000 µg/L Main supplier: GRANGEVILLE WATER DEPT · 3,151 people · 2019 Highest in the city: 685 µg/L — COUNTRY COURT COMMUNITY · 89 people · 2019	2/2	SYR4
Barium	27.85 µg/L 1.4% of the EPA limit 2000 µg/L Main supplier: GRANGEVILLE WATER DEPT · 3,151 people · 2019 Highest in the city: 30 µg/L — COUNTRY COURT COMMUNITY · 89 people · 2019	2/2	SYR4
Lithium	15 µg/L No EPA limit set Main supplier: GRANGEVILLE WATER DEPT · 3,151 people · 2025	1/2	UCMR-5
Chromium	12.669 µg/L 13% of the EPA limit 100 µg/L Main supplier: GRANGEVILLE WATER DEPT · 3,151 people · 2019	2/2	SYR4
TTHM	3.2445 µg/L 4.1% of the EPA limit 80 µg/L Main supplier: GRANGEVILLE WATER DEPT · 3,151 people · 2019	1/2	SYR4
Selenium	2.06 µg/L 4.1% of the EPA limit 50 µg/L Highest in the city: COUNTRY COURT COMMUNITY · 89 people · 2019	1/2	SYR4
Tetrachloroethylene	1.76 µg/L 35% of the EPA limit 5 µg/L Main supplier: GRANGEVILLE WATER DEPT · 3,151 people · 2019	1/2	SYR4
Combined Uranium	1.04 µg/L 3.5% of the EPA limit 30 µg/L Main supplier: GRANGEVILLE WATER DEPT · 3,151 people · 2019 Highest in the city: 1.72 µg/L — COUNTRY COURT COMMUNITY · 89 people · 2016	2/2	SYR4
Combined Radium (-226 And -228)	0.9918 pCi/L 20% of the EPA limit 5 pCi/L Main supplier: GRANGEVILLE WATER DEPT · 3,151 people · 2019	2/2	SYR4
Gross Alpha, Excl. Radon And U	0.8810 pCi/L 5.9% of the EPA limit 15 pCi/L Main supplier: GRANGEVILLE WATER DEPT · 3,151 people · 2013	1/2	SYR4
Toluene	0.8600 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: GRANGEVILLE WATER DEPT · 3,151 people · 2019	1/2	SYR4
Picloram	0.1890 µg/L 0% of the EPA limit 500 µg/L Highest in the city: COUNTRY COURT COMMUNITY · 89 people · 2019	1/2	SYR4
Lead	0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: GRANGEVILLE WATER DEPT · 3,151 people · 2025 Highest in the city: 0.0040 mg/L — COUNTRY COURT COMMUNITY · 89 people · 2027	2/2	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 Grangeville

Supplier	Population served
GRANGEVILLE WATER DEPT	3,151
COUNTRY COURT COMMUNITY	89

Frequently asked questions about Grangeville tap water

Is Grangeville tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Grangeville. 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 Grangeville?

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

What contaminants are in Grangeville's water?

The contaminants EPA monitoring detected in Grangeville include Nitrate, Nitrate-Nitrite, Fluoride, Barium, Lithium. 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.