Public water system record
Dexter Oaks Co-Op
On record as serving Lane County, OR · Serves 75 people
Federal records show 17 health-based violations and 9 monitoring/reporting issues for Dexter Oaks Co-Op in the last ten years. The most serious issue in this window was a resolved Arsenic violation.
System profile
- Health-based violations, last 10 years
- 17
- Resolved
- 17
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 9
Key facts
- Dexter Oaks Co-Op draws water from 2 wells.
- Highest measured level in the last 10 years: Arsenic, 0.034 mg/L, federal limit 0.01 mg/L (3.4 times the limit), 2021.
- Record on file since 1976, with 10 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 38 service lines.
Check whether Dexter Oaks Co-Op serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Arsenic
Contaminant limit exceeded
Measured 0.013 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
|
330 | Jan 1, 2023 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.018 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
330 | Oct 1, 2022 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.023 mg/L, federal limit 0.01 mg/L (2.3 times the limit)
|
330 | Jul 1, 2022 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.027 mg/L, federal limit 0.01 mg/L (2.7 times the limit)
|
330 | Apr 1, 2022 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.022 mg/L, federal limit 0.01 mg/L (2.2 times the limit)
|
330 | Jan 1, 2022 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.021 mg/L, federal limit 0.01 mg/L (2.1 times the limit)
|
330 | Oct 1, 2021 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.019 mg/L, federal limit 0.01 mg/L (1.9 times the limit)
|
330 | Jul 1, 2021 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.03 mg/L, federal limit 0.01 mg/L (3 times the limit)
|
330 | Apr 1, 2021 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.034 mg/L, federal limit 0.01 mg/L (3.4 times the limit)
|
330 | Jan 1, 2021 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.027 mg/L, federal limit 0.01 mg/L (2.7 times the limit)
|
330 | Oct 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.028 mg/L, federal limit 0.01 mg/L (2.8 times the limit)
|
330 | Jul 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.024 mg/L, federal limit 0.01 mg/L (2.4 times the limit)
|
330 | Apr 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.021 mg/L, federal limit 0.01 mg/L (2.1 times the limit)
|
330 | Jan 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.024 mg/L, federal limit 0.01 mg/L (2.4 times the limit)
|
330 | Oct 1, 2019 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.016 mg/L, federal limit 0.01 mg/L (1.6 times the limit)
|
330 | Jul 1, 2019 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.011 mg/L, federal limit 0.01 mg/L (1.1 times the limit)
|
330 | Apr 1, 2019 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
|
330 | Jan 1, 2016 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2025 | Active |
|
Consumer Confidence Rule
OTHER
|
Oct 1, 2023 | Resolved |
|
Public Notice
OTHER
|
May 21, 2023 | Resolved |
|
Arsenic
Monitoring and reporting
|
Apr 1, 2023 | Resolved |
|
Public Notice
OTHER
|
Aug 29, 2022 | Resolved |
|
Arsenic
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Arsenic
Monitoring and reporting
|
Jul 1, 2018 | Resolved |
|
E. coli
Monitoring and reporting
|
Jun 20, 2017 | Resolved |
|
E. coli
Monitoring and reporting
|
Mar 12, 2017 | Resolved |
Full record since 1976
EPA's records for Dexter Oaks Co-Op go back to 1976. Before October 19, 2016 they list 10 health-based violations (3 resolved, 7 archived by EPA without a recorded fix) and 11 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1970s | 1 | 2 |
| 1980s | 5 | 0 |
| 1990s | 3 | 8 |
| 2000s | 0 | 1 |
| 2010 to October 18, 2016 | 1 | 0 |
| October 19, 2016 to 2019 | 3 | 3 |
| 2020s | 13 | 6 |
Most recent health-based violation before October 19, 2016: Arsenic, began January 2016, Resolved.
Show all 10 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Arsenic
Contaminant limit exceeded
|
Jan 1, 2016 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
May 1, 1997 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Dec 1, 1992 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Dec 1, 1992 | Resolved |
|
Arsenic
Contaminant limit exceeded
|
Apr 1, 1983 | Archived |
|
Arsenic
Contaminant limit exceeded
|
Jan 1, 1983 | Archived |
|
Arsenic
Contaminant limit exceeded
|
Oct 1, 1982 | Archived |
|
Arsenic
Contaminant limit exceeded
|
Oct 1, 1981 | Archived |
|
Arsenic
Contaminant limit exceeded
|
Oct 1, 1980 | Archived |
|
Arsenic
Contaminant limit exceeded
|
Oct 1, 1979 | Archived |
What the violations mean
Arsenic
17 incidentsArsenic exceeded the federal limit
Long-term arsenic exposure is linked to cancer and cardiovascular effects
Where the water comes from
Dexter Oaks Co-Op draws water from 2 wells.
Annual water quality report
Dexter Oaks Co-Op must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Dexter Oaks Co-Op for a copy.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Oregon.
Certified drinking water labs by state EPA guidance for private wells