Is Rexburg, ID Tap Water Safe? Quality & Contaminants

What was found in Rexburg'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	3027.5 µg/L 30% of the EPA limit 10000 µg/L Main supplier: REXBURG CITY OF · 40,695 people · 2019 Highest in the city: 5390 µg/L — SYRINGA PARK SUBD · 35 people · 2019	4/4	SYR4
Nitrate-Nitrite	2999 µg/L 30% of the EPA limit 10000 µg/L Main supplier: REXBURG CITY OF · 40,695 people · 2019 Highest in the city: 5390 µg/L — SYRINGA PARK SUBD · 35 people · 2019	2/4	SYR4
Fluoride	1332 µg/L 33% of the EPA limit 4000 µg/L Main supplier: REXBURG CITY OF · 40,695 people · 2018	4/4	SYR4
Barium	21.7 µg/L 1.1% of the EPA limit 2000 µg/L Main supplier: REXBURG CITY OF · 40,695 people · 2018 Highest in the city: 194.25 µg/L — CEDAR BUTTE SUBDIVISION · 300 people · 2019	4/4	SYR4
Lithium	29.6 µg/L No EPA limit set Main supplier: REXBURG CITY OF · 40,695 people · 2023	1/4	UCMR-5
Gross Alpha, Excl. Radon And U	6.45 pCi/L 43% of the EPA limit 15 pCi/L Main supplier: REXBURG CITY OF · 40,695 people · 2018	3/4	SYR4
Combined Uranium	3.3211 µg/L 11% of the EPA limit 30 µg/L Main supplier: REXBURG CITY OF · 40,695 people · 2018	3/4	SYR4
Combined Radium (-226 And -228)	3.1605 pCi/L 63% of the EPA limit 5 pCi/L Main supplier: REXBURG CITY OF · 40,695 people · 2018	4/4	SYR4
Arsenic	2.811 µg/L 28% of the EPA limit 10 µg/L Main supplier: REXBURG CITY OF · 40,695 people · 2018	2/4	SYR4
Chromium	2.13 µg/L 2.1% of the EPA limit 100 µg/L Main supplier: REXBURG CITY OF · 40,695 people · 2018	2/4	SYR4
Selenium	2 µg/L 4% of the EPA limit 50 µg/L Main supplier: REXBURG CITY OF · 40,695 people · 2018	2/4	SYR4
Di(2-ethylhexyl) Phthalate	1.7 µg/L 28% of the EPA limit 6 µg/L Main supplier: REXBURG CITY OF · 40,695 people · 2019	1/4	SYR4
Lead	0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: REXBURG CITY OF · 40,695 people · 2024	4/4	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 Rexburg

Supplier	Population served
REXBURG CITY OF	40,695
CEDAR BUTTE SUBDIVISION	300
HILLVIEW SUBD	50
SYRINGA PARK SUBD	35

Frequently asked questions about Rexburg tap water

Is Rexburg tap water safe to drink?

EPA testing detected 13 contaminants in the water serving Rexburg. 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 Rexburg?

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

What contaminants are in Rexburg's water?

The contaminants EPA monitoring detected in Rexburg 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.