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Tap water quality report

Upper Twin Lakes Water Company Inc

EPA monitoring tested this supplier for 38 contaminants and detected 5. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

38
contaminants tested
5
detected
227
people served
7
health-based violations
Idaho rankingsLead in IdahoPFAS in Idaho
Water source
Ground water
Ownership
Private
Counties served
Kootenai

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
48
violations on file
2
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2023-10-22
TT Health-based Resolved 2023-10-22
TT Health-based Resolved 2023-10-22
MCL Health-based Archived 2000-02-01 → 2000-02-29
MCL Health-based Archived 1999-11-01 → 1999-11-30
MCL Health-based Archived 1999-09-01 → 1999-09-30
MCL Health-based Resolved 1999-01-01 → 2001-12-31
MR Monitoring Unaddressed 2025-12-30
MR Monitoring Unaddressed 2025-12-30
MR Monitoring Resolved 2020-10-01

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
0.0100 mg/L 67%
of the EPA limit 0.0150 mg/L
 17/17 LCR 2026
Gross Alpha, Excl. Radon And U
0.3286 pCi/L 2.2%
of the EPA limit 15 pCi/L
worst single sample: 0.3300 pCi/L
2/2 SYR4 2016
Nitrate
163 µg/L 1.6%
of the EPA limit 10000 µg/L
 2/28 SYR4 2012–2019
Barium
23 µg/L 1.2%
of the EPA limit 2000 µg/L
 1/2 SYR4 2019
Nitrate-Nitrite
163 µg/L 1.6%
of the EPA limit 10000 µg/L
 1/2 SYR4 2019
33 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalArsenicBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbon TetrachlorideChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneEthylbenzeneFluorideMercuryNitriteSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MILLER, RENEE
Phone
208-660-3103
Email
[email protected]

Frequently asked questions about Upper Twin Lakes Water Company Inc

Is Upper Twin Lakes Water Company Inc tap water safe to drink?

EPA monitoring detected 5 contaminants in Upper Twin Lakes Water Company Inc'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 Upper Twin Lakes Water Company Inc's water?

EPA monitoring detected Lead, Gross Alpha, Excl. Radon And U, Nitrate, Barium, Nitrate-Nitrite. The full list with the level and data source for each is above.

How many people does Upper Twin Lakes Water Company Inc serve?

Upper Twin Lakes Water Company Inc reports serving 227 people in Idaho, per its EPA record.

Has Upper Twin Lakes Water Company Inc had any water quality violations?

The EPA has 48 violations on file for Upper Twin Lakes Water Company Inc, of which 7 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.