Tap WaterIndex

← Idaho

Tap water quality report

Preston City of

EPA monitoring tested this supplier for 99 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

99
contaminants tested
8
detected
5,591
people served
12
health-based violations
Idaho rankingsLead in IdahoPFAS in Idaho
Water source
Ground water
Ownership
Local government
Counties served
Franklin

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

12
health-based violations
149
violations on file
2
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2024-06-01 → 2024-06-30
MCL Health-based Resolved 2024-06-01 → 2024-06-30
MCL Health-based Resolved 2024-06-01 → 2024-06-30
MCL Health-based Resolved 2024-06-01 → 2024-06-30
MCL Health-based Resolved 2024-06-01 → 2024-06-30
MCL Health-based Resolved 2023-06-01 → 2023-06-30
MCL Health-based Resolved 2023-06-01 → 2023-06-30
MCL Health-based Resolved 2023-06-01 → 2023-06-30
MCL Health-based Resolved 2023-06-01 → 2023-06-30
MCL Health-based Resolved 2023-06-01 → 2023-06-30

Other contaminants detected

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2022
TTHM
3.8 µg/L 4.8%
of the EPA limit 80 µg/L
 5/8 SYR4 2013–2019
Nitrate
220 µg/L 2.2%
of the EPA limit 10000 µg/L
 2/18 SYR4 2012–2019
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
 1/1 SYR4 2019
Barium
11 µg/L 0.5%
of the EPA limit 2000 µg/L
 1/1 SYR4 2019
Chloroform
0.6700 µg/L
No EPA limit set
 1/1 SYR4 2016
Combined Radium (-226 And -228)
0.1030 pCi/L 2.1%
of the EPA limit 5 pCi/L
 1/1 SYR4 2016
Combined Uranium
0.1300 µg/L 0.4%
of the EPA limit 30 µg/L
 1/1 SYR4 2016
91 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)Total Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ACOCK, LINDA
Phone
208-852-1817
Email
lindaa@prestonid.us

Frequently asked questions about Preston City of

Is Preston City of tap water safe to drink?

EPA monitoring detected 8 contaminants in Preston City of's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Preston City of's water?

EPA monitoring detected Lead, TTHM, Nitrate, Arsenic, Barium, and others. The full list with the level and data source for each is above.

How many people does Preston City of serve?

Preston City of reports serving 5,591 people in Idaho, per its EPA record.

Has Preston City of had any water quality violations?

The EPA has 149 violations on file for Preston City of, of which 12 are health-based (a contaminant limit or required treatment was breached) and 2 remain open. The rest are monitoring or reporting failures.

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.