Issaquah Water Quality
Washington
According to EPA SDWIS, Issaquah, Washington is served by 4 community water systems covering about 43,739 people. The same extract lists 1 health-based violation record, most recently coded 8000 in 2018. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Issaquah, Washington is delivered through 4 EPA-regulated community water systems serving an estimated 43,739 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 1 violation record across the 4 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 1 distinct EPA contaminant code: Revised Total Coliform Rule. 1 TRI-reporting industrial facility is 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 Washington 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 |
|---|---|---|---|
| ISSAQUAH WATER SYSTEM | 43,584 | 0 | Clean |
| ISSAQUAH VALLEY WATER ASSN #1 | 80 | 1 | Health |
| ALPINE MOBILE MANOR | 45 | 0 | Clean |
| TIGER MTN TRACTS | 30 | 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 |
|---|---|---|
| ISSAQUAH VALLEY WATER ASSN #1 | Revised Total Coliform Rule | 2018-06-01 |
What are Issaquah's health-based records for?
Every health-based violation record in Issaquah carries one EPA contaminant or rule code. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Revised Total Coliform Rule | 1 | 1 |
TRI Facilities in Issaquah
| Facility | Total Releases |
|---|---|
| Darigold - Issaquah | 134.4K lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Issaquah, Washington? ▼
How many water violations does Issaquah have in this EPA extract? ▼
What contaminants were found in Issaquah water? ▼
How many water systems serve Issaquah? ▼
Where does Issaquah get its drinking water? ▼
Are there pollution sources near Issaquah? ▼
How does Issaquah compare in Washington?
Of the 365 Washington places with at least one community water system on file, Issaquah ranks #96 by number of systems (4).
Either side of it: Graham (4), Hoquiam (4), La Conner (4), Lummi Island (4)
About This Data
Figures here are the current EPA SDWIS extract joined to the 4 community water systems whose service area lists Issaquah, ranked against the 365 Washington 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.