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Tap water quality report

Rupert, ID

EPA monitoring detected 9 contaminants across the 2 water suppliers serving Rupert. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
6,046
people served
9
contaminants found
Idaho rankings Lead in Idaho PFAS in Idaho

What was found in Rupert'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.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
420 µg/L 4.2%
of the EPA limit 10000 µg/L
Main supplier: RUPERT CITY OF · 5,796 people · 2019
Highest in the city: 1280 µg/L — PAUL HOUSING AUTHORITY · 250 people · 2019
2/2 SYR4
Fluoride
778 µg/L 19%
of the EPA limit 4000 µg/L
Main supplier: RUPERT CITY OF · 5,796 people · 2019
1/2 SYR4
Barium
449 µg/L 22%
of the EPA limit 2000 µg/L
Main supplier: RUPERT CITY OF · 5,796 people · 2019
1/2 SYR4
Lithium
150 µg/L
No EPA limit set
Main supplier: RUPERT CITY OF · 5,796 people · 2025
1/2 UCMR-5
Gross Alpha, Excl. Radon And U
1.3 pCi/L 8.7%
of the EPA limit 15 pCi/L
Main supplier: RUPERT CITY OF · 5,796 people · 2016
Highest in the city: 5.1 pCi/L — PAUL HOUSING AUTHORITY · 250 people · 2018
2/2 SYR4
Total Haloacetic Acids (HAA5)
4.55 µg/L 7.6%
of the EPA limit 60 µg/L
Main supplier: RUPERT CITY OF · 5,796 people · 2019
1/2 SYR4
Combined Radium (-226 And -228)
3.325 pCi/L 67%
of the EPA limit 5 pCi/L
Main supplier: RUPERT CITY OF · 5,796 people · 2019
2/2 SYR4
Combined Uranium
1.5 µg/L 5%
of the EPA limit 30 µg/L
Highest in the city: PAUL HOUSING AUTHORITY · 250 people · 2018
1/2 SYR4
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
Main supplier: RUPERT CITY OF · 5,796 people · 2025
Highest in the city: 0.0040 mg/L — PAUL HOUSING AUTHORITY · 250 people · 2023
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 Rupert

SupplierPopulation served
RUPERT CITY OF 5,796
PAUL HOUSING AUTHORITY 250

Frequently asked questions about Rupert tap water

Is Rupert tap water safe to drink?

EPA testing detected 9 contaminants in the water serving Rupert. 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 Rupert?

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

What contaminants are in Rupert's water?

The contaminants EPA monitoring detected in Rupert include Nitrate, Fluoride, Barium, Lithium, Gross Alpha, Excl. Radon And U. 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.