Community Water System · PWSID OR4100998

Dexter Oaks Co-Op

Serves 75 peopleGroundwaterOwner: PrivateDexter, Oregon
Nothing open right now.

On record since 1994: 27 violations. 17 over the limit · 7 missed or late tests · 3 notices or reports. Most recent began 2023-10-01.

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

17Over the limit
0Treatment lapse
7Missed or late test
3Notice or report

More violations on record than 83% of active water systems in Oregon. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

1994 · Missed or late test: 21994 · Missed or late test: 2199520002005201020152016 · Over the limit: 12017 · Missed or late test: 22017 · Missed or late test: 22018 · Missed or late test: 12019 · Over the limit: 32019 · Over the limit: 32019 · Over the limit: 32020 · Over the limit: 42020 · Over the limit: 42020 · Over the limit: 42020 · Over the limit: 420202021 · Over the limit: 42021 · Over the limit: 42021 · Over the limit: 42021 · Over the limit: 42021 · Missed or late test: 12022 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42022 · Notice or report: 12023 · Over the limit: 12023 · Missed or late test: 12023 · Notice or report: 22023 · Notice or report: 22025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
63% over the limit · 1726% missed or late test · 711% notice or report · 3

Across Oregon, 85% of violations are missed or late tests and 2% are water over a limit.

How far over the limit

at the limit2×5×10×100×+Arsenic2023-01-01 · Arsenic: measured 0.0130 MG/L vs limit 0.0100 MG/L (1.3×)2022-10-01 · Arsenic: measured 0.0180 MG/L vs limit 0.0100 MG/L (1.8×)2022-07-01 · Arsenic: measured 0.0230 MG/L vs limit 0.0100 MG/L (2.3×)2022-04-01 · Arsenic: measured 0.0270 MG/L vs limit 0.0100 MG/L (2.7×)2022-01-01 · Arsenic: measured 0.0220 MG/L vs limit 0.0100 MG/L (2.2×)2021-10-01 · Arsenic: measured 0.0210 MG/L vs limit 0.0100 MG/L (2.1×)2021-07-01 · Arsenic: measured 0.0190 MG/L vs limit 0.0100 MG/L (1.9×)2021-04-01 · Arsenic: measured 0.0300 MG/L vs limit 0.0100 MG/L (3.0×)2021-01-01 · Arsenic: measured 0.0340 MG/L vs limit 0.0100 MG/L (3.4×)2020-10-01 · Arsenic: measured 0.0270 MG/L vs limit 0.0100 MG/L (2.7×)2020-07-01 · Arsenic: measured 0.0280 MG/L vs limit 0.0100 MG/L (2.8×)2020-04-01 · Arsenic: measured 0.0240 MG/L vs limit 0.0100 MG/L (2.4×)2020-01-01 · Arsenic: measured 0.0210 MG/L vs limit 0.0100 MG/L (2.1×)2019-10-01 · Arsenic: measured 0.0240 MG/L vs limit 0.0100 MG/L (2.4×)2019-07-01 · Arsenic: measured 0.0160 MG/L vs limit 0.0100 MG/L (1.6×)2019-04-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2016-01-01 · Arsenic: measured 0.4000 MG/L vs limit 0.0100 MG/L (40.0×)
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 3 results on file · action level 15 ppb

9.9 ppb
4.9 ppb
0 ppb

Every violation on record

  1. 2023-10-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  2. 2023-05-21Public NoticePN Violation for NPDWR ViolationBack in compliance
  3. 2023-04-01ArsenicMonitoring, RegularBack in compliance
  4. 2023-01-01ArsenicMCL, Averagemeasured 0.0130 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  5. 2022-10-01ArsenicMCL, Averagemeasured 0.0180 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  6. 2022-08-29Public NoticePN Violation for NPDWR ViolationBack in compliance
  7. 2022-07-01ArsenicMCL, Averagemeasured 0.0230 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  8. 2022-04-01ArsenicMCL, Averagemeasured 0.0270 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  9. 2022-01-01ArsenicMCL, Averagemeasured 0.0220 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  10. 2021-10-01ArsenicMCL, Averagemeasured 0.0210 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  11. 2021-07-01ArsenicMCL, Averagemeasured 0.0190 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  12. 2021-04-01ArsenicMCL, Averagemeasured 0.0300 MG/L · limit 0.0100 MG/LBack in compliance
  13. 2021-01-01ArsenicMonitoring, RegularBack in compliance
  14. 2021-01-01ArsenicMCL, Averagemeasured 0.0340 MG/L · limit 0.0100 MG/LBack in compliance
  15. 2020-10-01ArsenicMCL, Averagemeasured 0.0270 MG/L · limit 0.0100 MG/LBack in compliance
  16. 2020-07-01ArsenicMCL, Averagemeasured 0.0280 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  17. 2020-04-01ArsenicMCL, Averagemeasured 0.0240 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  18. 2020-01-01ArsenicMCL, Averagemeasured 0.0210 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  19. 2019-10-01ArsenicMCL, Averagemeasured 0.0240 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  20. 2019-07-01ArsenicMCL, Averagemeasured 0.0160 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  21. 2019-04-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  22. 2018-07-01ArsenicMonitoring, RegularBack in compliance
  23. 2017-06-20E. ColiMonitoring, Source Water (GWR)Back in compliance
  24. 2017-03-12E. ColiMonitoring, Source Water (GWR)Back in compliance
  25. 2016-01-01ArsenicMCL, Single Samplemeasured 0.4000 MG/L · limit 0.0100 MG/LBack in compliance
Show the other 2 entries
  1. 1994-07-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance
  2. 1994-01-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance

System details

Population served75
Service connections38
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CityDexter
EPA ZIP on file97431

Areas served

  • Lane County

Reading this record

Dexter Oaks Co-Op is a community water system that draws from groundwater and serves about 75 people in Dexter, Oregon. 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.