Is Sun Valley, ID Tap Water Safe? Quality & Contaminants

What was found in Sun Valley'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	478 µg/L 4.8% of the EPA limit 10000 µg/L Main supplier: SUN VALLEY WATER AND SEWER DIST · 3,400 people · 2019 Highest in the city: 670 µg/L — ASPEN HOLLOW HOMEOWNERS ASSOC · 75 people · 2019	2/2	SYR4
Nitrate-Nitrite	410 µg/L 4.1% of the EPA limit 10000 µg/L Highest in the city: ASPEN HOLLOW HOMEOWNERS ASSOC · 75 people · 2013	1/2	SYR4
Barium	318.5 µg/L 16% of the EPA limit 2000 µg/L Main supplier: SUN VALLEY WATER AND SEWER DIST · 3,400 people · 2019	2/2	SYR4
Gross Alpha, Excl. Radon And U	7.157 pCi/L 48% of the EPA limit 15 pCi/L Main supplier: SUN VALLEY WATER AND SEWER DIST · 3,400 people · 2019	1/2	SYR4
TTHM	5.47 µg/L 6.8% of the EPA limit 80 µg/L Main supplier: SUN VALLEY WATER AND SEWER DIST · 3,400 people · 2019	1/2	SYR4
Combined Radium (-226 And -228)	3.367 pCi/L 67% of the EPA limit 5 pCi/L Main supplier: SUN VALLEY WATER AND SEWER DIST · 3,400 people · 2019	2/2	SYR4
Selenium	2.779 µg/L 5.6% of the EPA limit 50 µg/L Main supplier: SUN VALLEY WATER AND SEWER DIST · 3,400 people · 2019	1/2	SYR4
Combined Uranium	1.616 µg/L 5.4% of the EPA limit 30 µg/L Main supplier: SUN VALLEY WATER AND SEWER DIST · 3,400 people · 2019 Highest in the city: 2 µg/L — ASPEN HOLLOW HOMEOWNERS ASSOC · 75 people · 2016	2/2	SYR4
Total Haloacetic Acids (HAA5)	1.334 µg/L 2.2% of the EPA limit 60 µg/L Main supplier: SUN VALLEY WATER AND SEWER DIST · 3,400 people · 2019	1/2	SYR4
Chromium	1.13 µg/L 1.1% of the EPA limit 100 µg/L Main supplier: SUN VALLEY WATER AND SEWER DIST · 3,400 people · 2019	1/2	SYR4
Lead	0.0040 mg/L 27% of the EPA limit 0.0150 mg/L Main supplier: SUN VALLEY WATER AND SEWER DIST · 3,400 people · 2025	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 Sun Valley

Supplier	Population served
SUN VALLEY WATER AND SEWER DIST	3,400
ASPEN HOLLOW HOMEOWNERS ASSOC	75

Frequently asked questions about Sun Valley tap water

Is Sun Valley tap water safe to drink?

EPA testing detected 11 contaminants in the water serving Sun Valley. 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 Sun Valley?

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

What contaminants are in Sun Valley's water?

The contaminants EPA monitoring detected in Sun Valley include Nitrate, Nitrate-Nitrite, Barium, Gross Alpha, Excl. Radon And U, 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.