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Tap water quality report

Twenty Mile Creek Water Assn

EPA monitoring tested this supplier for 19 contaminants and detected 6. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

19
contaminants tested
6
detected
225
people served
106
health-based violations
Idaho rankingsLead in IdahoPFAS in Idaho
Water source
Surface water
Ownership
Private
Counties served
Boundary

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.

106
health-based violations
127
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2024-04-01 → 2024-06-30
MCL Health-based Resolved 2024-04-01 → 2024-06-30
MCL Health-based Resolved 2024-04-01 → 2024-06-30
MCL Health-based Resolved 2024-04-01 → 2024-06-30
TT Health-based Resolved 2018-03-01 → 2018-03-31
TT Health-based Resolved 2018-03-01 → 2018-03-31
TT Health-based Resolved 2018-03-01 → 2018-03-31
TT Health-based Resolved 2018-03-01 → 2018-03-31
TT Health-based Resolved 2017-03-01 → 2017-03-31
TT Health-based Resolved 2017-03-01 → 2017-03-31

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
TTHM
92 µg/L 115%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 101 µg/L
11/11 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
64.1 µg/L 107%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
worst single sample: 65.1 µg/L
11/11 SYR4 2012–2019
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
 8/8 LCR 2025
Combined Uranium
2.387 µg/L 8%
of the EPA limit 30 µg/L
worst single sample: 2.46 µg/L
2/2 SYR4 2013–2019
Barium
9 µg/L 0.5%
of the EPA limit 2000 µg/L
 1/1 SYR4 2018
Fluoride
118 µg/L 2.9%
of the EPA limit 4000 µg/L
 1/1 SYR4 2019
13 contaminants tested, none detected
Antimony, TotalAsbestosBeryllium, TotalCadmiumChromiumCombined Radium (-226 And -228)Gross Alpha, Excl. Radon And UMercuryNitrateNitrate-NitriteNitriteSeleniumThallium, Total

Utility contact

Contact
KRAMER, ANDREA
Phone
208-267-3105
Email
[email protected]

Frequently asked questions about Twenty Mile Creek Water Assn

Is Twenty Mile Creek Water Assn tap water safe to drink?

EPA monitoring detected 6 contaminants in Twenty Mile Creek Water 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 Twenty Mile Creek Water Assn's water?

EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Lead, Combined Uranium, Barium, and others. The full list with the level and data source for each is above.

How many people does Twenty Mile Creek Water Assn serve?

Twenty Mile Creek Water Assn reports serving 225 people in Idaho, per its EPA record.

Has Twenty Mile Creek Water Assn had any water quality violations?

The EPA has 127 violations on file for Twenty Mile Creek Water Assn, of which 106 are health-based (a contaminant limit or required treatment was breached) and 0 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.