Is Potlatch, ID Tap Water Safe? Quality & Contaminants

What was found in Potlatch'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
Fluoride	250.1 µg/L 6.3% of the EPA limit 4000 µg/L Main supplier: POTLATCH CITY OF · 812 people · 2019 Highest in the city: 385 µg/L — Y MOBILE HOME PARK · 52 people · 2019	3/3	SYR4
Barium	70.166 µg/L 3.5% of the EPA limit 2000 µg/L Main supplier: POTLATCH CITY OF · 812 people · 2019	3/3	SYR4
Lithium	36 µg/L No EPA limit set Main supplier: POTLATCH CITY OF · 812 people · 2023	1/3	UCMR-5
TTHM	7.4315 µg/L 9.3% of the EPA limit 80 µg/L Main supplier: POTLATCH CITY OF · 812 people · 2019	1/3	SYR4
Arsenic	5.472 µg/L 55% of the EPA limit 10 µg/L Main supplier: POTLATCH CITY OF · 812 people · 2019	1/3	SYR4
Chromium	5.414 µg/L 5.4% of the EPA limit 100 µg/L Main supplier: POTLATCH CITY OF · 812 people · 2019	3/3	SYR4
Copper	1.899 µg/L 0.1% of the EPA limit 1300 µg/L Highest in the city: Y MOBILE HOME PARK · 52 people · 2018	1/3	SYR4
Combined Radium (-226 And -228)	0.5032 pCi/L 10% of the EPA limit 5 pCi/L Main supplier: POTLATCH CITY OF · 812 people · 2019 Highest in the city: 1.4095 pCi/L — Y MOBILE HOME PARK · 52 people · 2019	3/3	SYR4
Gross Alpha, Excl. Radon And U	0.1630 pCi/L 1.1% of the EPA limit 15 pCi/L Main supplier: POTLATCH CITY OF · 812 people · 2016 Highest in the city: 0.4690 pCi/L — Y MOBILE HOME PARK · 52 people · 2016	3/3	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: POTLATCH CITY OF · 812 people · 2025 Highest in the city: 0.0020 mg/L — ONAWAY WATER AND SEWER ASSN · 200 people · 2025	3/3	LCR
Combined Uranium	0.0011 µg/L 0% of the EPA limit 30 µg/L Highest in the city: Y MOBILE HOME PARK · 52 people · 2016	1/3	SYR4
Asbestos	-0.20 MFL -2.9% of the EPA limit 7 MFL Main supplier: POTLATCH CITY OF · 812 people · 2013	1/3	SYR4

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 Potlatch

Supplier	Population served
POTLATCH CITY OF	812
ONAWAY WATER AND SEWER ASSN	200
Y MOBILE HOME PARK	52

Frequently asked questions about Potlatch tap water

Is Potlatch tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Potlatch. 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 Potlatch?

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

What contaminants are in Potlatch's water?

The contaminants EPA monitoring detected in Potlatch include Fluoride, Barium, Lithium, TTHM, Arsenic. 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.