Tamoshan
EPA ID: WA5387140 · 260 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for Tamoshan (WA5387140): 8 past health-based violations, since resolved. Looking at the EPA enforcement file for Tamoshan, 11 violations appear in the five-year dataset, but none remain open - the utility has addressed each finding and is in current compliance, with no pending enforcement affecting the 260 people in its service area.
Data: EPA SDWIS
Service Area Map
Coverage area for Tamoshan Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Tamoshan serves a community with a median household income of $87,154 and an estimated 35,043 residents across its service area. Approximately 48% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Tamoshan's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Superfund Proximity Note: This service area ranks in the 70th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Detected Contaminants
How Tamoshan compares to EPA limits
What This Means For You
Total Trihalomethanes (TTHM) at 8 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Consumer Confidence Report Rule at 3 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 5 detections recorded. 2 exceed federal EPA limits (4 ppt for PFOA/PFOS).
Total Trihalomethanes (TTHM) was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in Washington
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Tamoshan (EPA ID: WA5387140) is a community water system in Washington that serves approximately 260 people from groundwater sources.
This system serves ZIP code 98502 in Olympia.
Violation History
Status breakdown for accepted records with record years 2021-2026: 11 resolved, 0 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| June 1, 2025 | Consumer Confidence Report Rule | Non-health-based | Resolved |
| April 1, 2023 | Total Trihalomethanes (TTHM) | Health-based | Resolved |
| January 1, 2023 | Total Trihalomethanes (TTHM) | Health-based | Resolved |
| October 1, 2022 | Total Trihalomethanes (TTHM) | Health-based | Resolved |
| July 1, 2022 | Total Trihalomethanes (TTHM) | Health-based | Resolved |
| April 1, 2022 | Total Trihalomethanes (TTHM) | Health-based | Resolved |
| January 1, 2022 | Total Trihalomethanes (TTHM) | Health-based | Resolved |
| December 1, 2021 | Consumer Confidence Report Rule | Non-health-based | Resolved |
| November 1, 2021 | Consumer Confidence Report Rule | Non-health-based | Resolved |
| October 1, 2021 | Total Trihalomethanes (TTHM) | Health-based | Resolved |
| July 1, 2021 | Total Trihalomethanes (TTHM) | Health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 8 | Yes |
| Consumer Confidence Report Rule | Reporting Failure | 3 | No |
Health Risk Details
Total Trihalomethanes (TTHM) (EPA limit: 0.08 mg/L)
Bladder & rectal cancer risk; reproductive concerns At-risk groups: pregnant women, long-term consumers of chlorinated water, people who frequently shower in chlorinated water.
Removal methods: granular activated carbon (GAC), carbon block filter, point-of-entry aeration. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0066 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by WA or modeled from parcel and building-footprint data.
- 98502 - Olympia
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Tamoshan (WA5387140) on EPA.gov.
Frequently Asked Questions
Is Tamoshan water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Tamoshan; its 11 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Tamoshan serve?
Tamoshan serves approximately 260 people across 1 ZIP code in Washington.
Where does Tamoshan get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Tamoshan (WA): 8 Health Violations. https://zipcheckup.com/water-system/wa5387140/
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author = {{ZipCheckup}},
title = {{Tamoshan (WA): 8 Health Violations}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/wa5387140/}
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What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Tamoshan (EPA ID: WA5387140) - request the latest Consumer Confidence Report or ask about specific contaminants.