Coos Bay Water Quality
Oregon
According to EPA SDWIS, Coos Bay, Oregon is served by 5 community water systems covering about 34,706 people. The same extract lists 52 health-based violation records, most recently coded 0300 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Coos Bay, Oregon is delivered through 5 EPA-regulated community water systems serving an estimated 34,706 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 52 violation records across the 5 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 3 distinct EPA contaminant codes: Interim Enhanced Surface Water Treatment Rule, Surface Water Treatment Rule, Total Haloacetic Acids (HAA5). 2 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Oregon drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| COOS BAY NORTH BEND WTR BRD | 34,500 | 0 | Clean |
| GARDEN VALLEY WATER ASSOCIATION | 84 | 32 | Health |
| SUMNER WATER CORPORATION | 50 | 9 | Health |
| COUNTRY CLUB ESTATES WD | 45 | 10 | Health |
| WATSONVILLE WATER SYSTEM | 27 | 1 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2025-12-01 |
| GARDEN VALLEY WATER ASSOCIATION | Surface Water Treatment Rule | 2025-11-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2025-11-01 |
| GARDEN VALLEY WATER ASSOCIATION | Surface Water Treatment Rule | 2025-10-01 |
| GARDEN VALLEY WATER ASSOCIATION | Surface Water Treatment Rule | 2025-09-01 |
| GARDEN VALLEY WATER ASSOCIATION | Surface Water Treatment Rule | 2025-09-01 |
| GARDEN VALLEY WATER ASSOCIATION | Surface Water Treatment Rule | 2025-07-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2025-07-01 |
| GARDEN VALLEY WATER ASSOCIATION | Surface Water Treatment Rule | 2025-04-01 |
| GARDEN VALLEY WATER ASSOCIATION | Surface Water Treatment Rule | 2025-03-01 |
| GARDEN VALLEY WATER ASSOCIATION | Surface Water Treatment Rule | 2025-03-01 |
| GARDEN VALLEY WATER ASSOCIATION | Surface Water Treatment Rule | 2025-02-01 |
| GARDEN VALLEY WATER ASSOCIATION | Surface Water Treatment Rule | 2025-02-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2024-07-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2024-07-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2024-06-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2024-06-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2024-06-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2023-12-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2023-12-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2023-12-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2023-03-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2023-03-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2023-03-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2023-03-01 |
| SUMNER WATER CORPORATION | Surface Water Treatment Rule | 2022-01-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2022-01-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2022-01-01 |
| WATSONVILLE WATER SYSTEM | Surface Water Treatment Rule | 2022-01-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2021-12-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2021-12-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2021-07-01 |
| GARDEN VALLEY WATER ASSOCIATION | Interim Enhanced Surface Water Treatment Rule | 2021-07-01 |
| COUNTRY CLUB ESTATES WD | Total Haloacetic Acids (HAA5) | 2020-07-01 |
| COUNTRY CLUB ESTATES WD | Total Haloacetic Acids (HAA5) | 2020-07-01 |
| COUNTRY CLUB ESTATES WD | Total Haloacetic Acids (HAA5) | 2020-01-01 |
| COUNTRY CLUB ESTATES WD | Total Haloacetic Acids (HAA5) | 2020-01-01 |
| SUMNER WATER CORPORATION | Surface Water Treatment Rule | 2019-04-01 |
| SUMNER WATER CORPORATION | Surface Water Treatment Rule | 2019-04-01 |
| SUMNER WATER CORPORATION | Surface Water Treatment Rule | 2019-03-01 |
| SUMNER WATER CORPORATION | Surface Water Treatment Rule | 2019-03-01 |
| SUMNER WATER CORPORATION | Surface Water Treatment Rule | 2019-02-01 |
| SUMNER WATER CORPORATION | Surface Water Treatment Rule | 2019-02-01 |
| SUMNER WATER CORPORATION | Surface Water Treatment Rule | 2019-01-01 |
| SUMNER WATER CORPORATION | Surface Water Treatment Rule | 2019-01-01 |
| COUNTRY CLUB ESTATES WD | Surface Water Treatment Rule | 2019-01-01 |
| COUNTRY CLUB ESTATES WD | Surface Water Treatment Rule | 2019-01-01 |
| COUNTRY CLUB ESTATES WD | Surface Water Treatment Rule | 2018-12-01 |
| COUNTRY CLUB ESTATES WD | Surface Water Treatment Rule | 2018-12-01 |
| COUNTRY CLUB ESTATES WD | Surface Water Treatment Rule | 2018-11-01 |
What are Coos Bay's health-based records for?
Coos Bay's health-based violation records carry 3 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Surface Water Treatment Rule | 27 | 4 |
| Interim Enhanced Surface Water Treatment Rule | 21 | 1 |
| Total Haloacetic Acids (HAA5) | 4 | 1 |
TRI Facilities in Coos Bay
| Facility | Total Releases |
|---|---|
| Millington Concrete | 122 lbs |
| Coos Asphalt | 1 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Coos Bay, Oregon? ▼
How many water violations does Coos Bay have in this EPA extract? ▼
What contaminants were found in Coos Bay water? ▼
How many water systems serve Coos Bay? ▼
Where does Coos Bay get its drinking water? ▼
Are there pollution sources near Coos Bay? ▼
How does Coos Bay compare in Oregon?
Of the 287 Oregon places with at least one community water system on file, Coos Bay ranks #40 by number of systems (5).
Either side of it: Waldport (6), Brownsville (5), Estacada (5), Happy Valley (5)
About This Data
Figures here are the current EPA SDWIS extract joined to the 5 community water systems whose service area lists Coos Bay, ranked against the 287 Oregon places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.