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Tap water quality report

Onaway Water and Sewer Assn

EPA monitoring tested this supplier for 68 contaminants and detected 6. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

68
contaminants tested
6
detected
200
people served
7
health-based violations
Idaho rankingsLead in IdahoPFAS in Idaho
Water source
Ground water
Ownership
Private
Counties served
Latah

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.

7
health-based violations
21
violations on file
4
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2014-04-01 → 2014-04-30
MCL Health-based Resolved 2014-04-01 → 2014-04-30
MCL Health-based Resolved 2014-04-01 → 2014-04-30
MCL Health-based Resolved 2014-04-01 → 2014-04-30
MCL Health-based Archived 2002-05-01 → 2002-05-31
MCL Health-based Archived 2000-11-01 → 2000-11-30
MCL Health-based Archived 1995-07-01 → 1995-07-31
MR Monitoring Unaddressed 2025-07-08
MR Monitoring Unaddressed 2025-07-08
MR Monitoring Resolved 2024-10-07

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 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 8/8 LCR 2025
Combined Radium (-226 And -228)
0.7175 pCi/L 14%
of the EPA limit 5 pCi/L
worst single sample: 0.7530 pCi/L
2/2 SYR4 2013–2019
Barium
2.78 µg/L 0.1%
of the EPA limit 2000 µg/L
 1/1 SYR4 2019
Chromium
1.67 µg/L 1.7%
of the EPA limit 100 µg/L
 1/1 SYR4 2019
Fluoride
296 µg/L 7.4%
of the EPA limit 4000 µg/L
 1/1 SYR4 2019
Gross Alpha, Excl. Radon And U
0.0310 pCi/L 0.2%
of the EPA limit 15 pCi/L
 1/1 SYR4 2016
62 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitrateNitrate-NitriteNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
LUSBY, JULIE
Phone
208-596-6843
Email
[email protected]

Frequently asked questions about Onaway Water and Sewer Assn

Is Onaway Water and Sewer Assn tap water safe to drink?

EPA monitoring detected 6 contaminants in Onaway Water and Sewer Assn'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 Onaway Water and Sewer Assn's water?

EPA monitoring detected Lead, Combined Radium (-226 And -228), Barium, Chromium, Fluoride, and others. The full list with the level and data source for each is above.

How many people does Onaway Water and Sewer Assn serve?

Onaway Water and Sewer Assn reports serving 200 people in Idaho, per its EPA record.

Has Onaway Water and Sewer Assn had any water quality violations?

The EPA has 21 violations on file for Onaway Water and Sewer Assn, of which 7 are health-based (a contaminant limit or required treatment was breached) and 4 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.