Community Water System · PWSID ID1110030

Twenty Mile Creek Water Assn

Serves 225 peopleSurface WaterOwner: PrivateBonners Ferry, Idaho
Nothing open right now.

On record since 2016: 5 violations. 1 over the limit · 4 treatment lapses. Most recent began 2024-04-01.

For this year's test results, ask the utility for its annual Consumer Confidence Report. Every community system must publish one.

1Over the limit
4Treatment lapse
0Missed or late test
0Notice or report

More violations on record than 54% of active water systems in Idaho. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

2005201020152016 · Treatment lapse: 12017 · Treatment lapse: 22017 · Treatment lapse: 22018 · Treatment lapse: 120202024 · Over the limit: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
20% over the limit · 180% treatment lapse · 4

Across Idaho, 80% of violations are missed or late tests and 5% are water over a limit.

How far over the limit

at the limit2×5×10×100×+Trihalomethanes (TTHM)2024-04-01 · Trihalomethanes (TTHM): measured 0.0810 MG/L vs limit 0.0800 MG/L (1.0×)
Each dot is one over-the-limit violation: the measured value divided by the limit it broke, on a log scale. Most legal limits for chemicals are running averages set for a lifetime of drinking, so “just over” and “ten times over” are very different news. Hover a dot for the numbers.

Lead & copper at the tap

Utilities sample taps in homes most likely to have lead pipes, and report the 90th-percentile result: 9 in 10 homes sampled came in at or below this number. Above the red line (the action level) the utility must act. The action level is not a safe level; EPA's health goal for lead is zero. EPA's file does not date these results, so they are shown highest first.

Lead, 90th percentile 4 results on file · action level 15 ppb

9 ppb
7 ppb
7 ppb
5 ppb

Every violation on record

  1. 2024-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0810 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  2. 2018-03-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  3. 2017-03-01Surface water filtration (IESWTR)Single Turbidity Exceed (Enhanced SWTR)Back in compliance
  4. 2017-03-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  5. 2016-03-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance

System details

Population served225
Service connections89
Water sourceSurface Water
System typeCommunity Water System
OwnerPrivate
StatusActive
CityBonners Ferry
EPA ZIP on file83805

Areas served

  • Boundary County

Reading this record

Twenty Mile Creek Water Assn is a community water system that draws from surface water and serves about 225 people in Bonners Ferry, Idaho. Everything above comes from the EPA's Safe Drinking Water Information System (SDWIS), where states report every violation by every public water system.

Four kinds of violation. Only one is a measurement of the water: over the limit means a test came back above a legal maximum (an MCL). A treatment lapse means a required protective step was not done, such as disinfection, filtration, fixing a defect an inspector found, or filing a lead-pipe inventory. A missed or late test means a required test was skipped or never reported. That is the most common kind, and the most misread: it does not mean the water was bad, and it does not mean the water was fine. Notices and reports covers public notices and the annual Consumer Confidence Report.

Status. “Back in compliance” means the state recorded a return to compliance. “Period ended” means the violation's compliance period is over but no return to compliance was ever filed, which is common in older records. EPA's federal copy lags state records by months, so call the utility for anything current.