Tap WaterIndex

← Idaho

Tap water quality report

Preston, ID

EPA monitoring detected 17 contaminants across the 9 water suppliers serving Preston. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

9
water suppliers
7,989
people served
17
contaminants found
Idaho rankings Lead in Idaho PFAS in Idaho

What was found in Preston's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
12680 µg/L 127%
of the EPA limit, in the worst sample — 10000 µg/L
 6/9 SYR4
Nitrate-Nitrite
7180 µg/L 72%
of the EPA limit 10000 µg/L
 2/9 SYR4
Fluoride
600 µg/L 15%
of the EPA limit 4000 µg/L
 3/9 SYR4
Barium
90 µg/L 4.5%
of the EPA limit 2000 µg/L
 8/9 SYR4
TTHM
8.09 µg/L 10%
of the EPA limit 80 µg/L
 8/9 SYR4
Arsenic
8 µg/L 80%
of the EPA limit 10 µg/L
 4/9 SYR4
Selenium
8 µg/L 16%
of the EPA limit 50 µg/L
 5/9 SYR4
Total Haloacetic Acids (HAA5)
5.02 µg/L 8.4%
of the EPA limit 60 µg/L
 6/9 SYR4
Combined Uranium
4.6 µg/L 15%
of the EPA limit 30 µg/L
 8/9 SYR4
Gross Alpha, Excl. Radon And U
4.2 pCi/L 28%
of the EPA limit 15 pCi/L
 5/9 SYR4
Copper
4 µg/L 0.3%
of the EPA limit 1300 µg/L
 1/9 SYR4
Chromium
3 µg/L 3%
of the EPA limit 100 µg/L
 4/9 SYR4
Bromoform
2.33 µg/L
No EPA limit set
 1/9 SYR4
Combined Radium (-226 And -228)
1.672 pCi/L 33%
of the EPA limit 5 pCi/L
 6/9 SYR4
Dibromochloromethane
1.24 µg/L
No EPA limit set
 1/9 SYR4
Chloroform
0.6700 µg/L
No EPA limit set
 1/9 SYR4
Lead
0.0070 mg/L 47%
of the EPA limit 0.0150 mg/L
 8/9 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 single worst sample on record — 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 Preston

SupplierPopulation served
PRESTON CITY OF 5,591
FAIRVIEW WATER DIST 1,300
WHITNEY NASHVILLE WATER WORKS 403
CUB RIVER ACRES 180
BANIDA WATER AND SEWER DIST 180
PRESTON EASTSIDE WATER CO 120
BIRCH CREEK CULINARY 120
STRAWBERRY MINK CREEK WATER ASSN 75
WINDER WATER SYSTEM 20

Frequently asked questions about Preston tap water

Is Preston tap water safe to drink?

EPA testing detected 17 contaminants in the water serving Preston. 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 Preston?

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

What contaminants are in Preston's water?

The contaminants EPA monitoring detected in Preston include Nitrate, Nitrate-Nitrite, Fluoride, Barium, TTHM. The full list, with the highest level found 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.