TAMOSHAN
PWSID: WA5387140 · Olympia, WA · Serves 260 people
TAMOSHAN has 23 health-based violations out of 23 total. Health violations indicate contaminant levels exceeded EPA limits or required treatment was not followed.
TAMOSHAN (PWSID WA5387140) is a cws water system drawing from a groundwater source, regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. It serves approximately 260 people in Olympia, WA, and is subject to primacy enforcement by the Washington drinking-water program.
The system's federal compliance record contains 23 total violations, with 23 classified as health-based (MCL exceedances or treatment-technique failures). 2 distinct contaminants have been cited, including Haloacetic Acids (HAA5), Total Trihalomethanes (TTHM). Recorded violations span 2017–2023.
A historical violation does not necessarily describe current water quality, systems must notify customers and remediate, and monitoring-type violations often reflect reporting lapses rather than contamination. The most authoritative real-time source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the Washington state drinking-water program's public portal.
System Details
- EPA ID (PWSID)
- WA5387140
- System Type
- CWS
- Water Source
- Groundwater
- Location
- Olympia, WA
- Population Served
- 260
- Health Violations
- Yes (23)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Haloacetic Acids (HAA5) | 21 | 21 |
| Total Trihalomethanes (TTHM) | 2 | 2 |
Violation History (23)
| Contaminant | Health | Date |
|---|---|---|
| Haloacetic Acids (HAA5) | Yes | Apr 1, 2023 |
| Haloacetic Acids (HAA5) | Yes | Apr 1, 2023 |
| Haloacetic Acids (HAA5) | Yes | Apr 1, 2023 |
| Haloacetic Acids (HAA5) | Yes | Jan 1, 2023 |
| Haloacetic Acids (HAA5) | Yes | Jan 1, 2023 |
| Haloacetic Acids (HAA5) | Yes | Oct 1, 2022 |
| Haloacetic Acids (HAA5) | Yes | Oct 1, 2022 |
| Haloacetic Acids (HAA5) | Yes | Oct 1, 2022 |
| Haloacetic Acids (HAA5) | Yes | Jul 1, 2022 |
| Haloacetic Acids (HAA5) | Yes | Jul 1, 2022 |
| Haloacetic Acids (HAA5) | Yes | Jul 1, 2022 |
| Haloacetic Acids (HAA5) | Yes | Apr 1, 2022 |
| Haloacetic Acids (HAA5) | Yes | Apr 1, 2022 |
| Haloacetic Acids (HAA5) | Yes | Apr 1, 2022 |
| Haloacetic Acids (HAA5) | Yes | Jan 1, 2022 |
| Haloacetic Acids (HAA5) | Yes | Jan 1, 2022 |
| Haloacetic Acids (HAA5) | Yes | Jan 1, 2022 |
| Haloacetic Acids (HAA5) | Yes | Oct 1, 2021 |
| Haloacetic Acids (HAA5) | Yes | Oct 1, 2021 |
| Haloacetic Acids (HAA5) | Yes | Jul 1, 2021 |
| Haloacetic Acids (HAA5) | Yes | Jul 1, 2021 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2017 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2017 |
Frequently Asked Questions
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About This Data
Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Violation records may span multiple years.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.