Hermiston Water Quality
Oregon
According to EPA SDWIS, Hermiston, Oregon is served by 8 community water systems covering about 21,118 people. The same extract lists 22 health-based violation records, most recently coded 8000 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Hermiston, Oregon is delivered through 8 EPA-regulated community water systems serving an estimated 21,118 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 22 violation records across the 8 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 2 distinct EPA contaminant codes: Revised Total Coliform Rule, Nitrate. 5 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 |
|---|---|---|---|
| HERMISTON, CITY OF | 20,000 | 0 | Clean |
| VISTA HOME PARK | 300 | 0 | Clean |
| CHARLES TRACTS WATER COMPANY | 290 | 0 | Clean |
| HAT ROCK WATER COMPANY | 150 | 17 | Health |
| CHART SUBDIVISION | 125 | 1 | Health |
| SHADY REST MOBILE COURT | 110 | 0 | Clean |
| NORTH HILL WATER CORPORATION | 100 | 4 | Health |
| BLACK MOUNTAIN WATER DISTRICT | 43 | 0 | Clean |
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 |
|---|---|---|
| NORTH HILL WATER CORPORATION | Revised Total Coliform Rule | 2024-09-07 |
| NORTH HILL WATER CORPORATION | Revised Total Coliform Rule | 2024-09-07 |
| NORTH HILL WATER CORPORATION | Revised Total Coliform Rule | 2022-07-25 |
| NORTH HILL WATER CORPORATION | Revised Total Coliform Rule | 2022-07-25 |
| HAT ROCK WATER COMPANY | Revised Total Coliform Rule | 2019-07-22 |
| HAT ROCK WATER COMPANY | Revised Total Coliform Rule | 2019-07-22 |
| HAT ROCK WATER COMPANY | Revised Total Coliform Rule | 2019-07-22 |
| CHART SUBDIVISION | Revised Total Coliform Rule | 2017-11-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2017-01-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2017-01-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2016-07-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2016-07-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2016-01-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2016-01-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2015-07-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2015-07-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2015-04-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2015-04-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2014-04-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2014-04-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2014-01-01 |
| HAT ROCK WATER COMPANY | Nitrate | 2014-01-01 |
What are Hermiston's health-based records for?
Hermiston's health-based violation records carry 2 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 |
|---|---|---|
| Nitrate | 14 | 1 |
| Revised Total Coliform Rule | 8 | 3 |
TRI Facilities in Hermiston
| Facility | Total Releases |
|---|---|
| Lamb Weston Inc. | 1.4M lbs |
| American Rock Products Hermiston | 5.8K lbs |
| US Army National Guard Rees Training Center Ranges | 5.4K lbs |
| Clayton Hermiston | 0 lbs |
| Chs Hermiston Feed | 0 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Hermiston, Oregon? ▼
How many water violations does Hermiston have in this EPA extract? ▼
What contaminants were found in Hermiston water? ▼
How many water systems serve Hermiston? ▼
Where does Hermiston get its drinking water? ▼
Are there pollution sources near Hermiston? ▼
How does Hermiston compare in Oregon?
Of the 287 Oregon places with at least one community water system on file, Hermiston ranks #21 by number of systems (8).
Either side of it: Central Point (8), Cottage Grove (8), Molalla (8), Shady Cove (8)
About This Data
Figures here are the current EPA SDWIS extract joined to the 8 community water systems whose service area lists Hermiston, 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.