Sierra Water System
EPA ID: WA5304643 · 355 people served · 3 ZIP codes
ZipCheckup's reading of EPA SDWIS for Sierra Water System (WA5304643): 40 EPA violations in the last five years. Although 40 violations appeared on Sierra Water System's record, all have been remedied - currently compliant, 355 served.
Data: EPA SDWIS
Service Area Map
Coverage area for Sierra Water System Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Sierra Water System serves a community with a median household income of $113,875 and an estimated 16,569 residents across its service area. Approximately 49% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Sierra Water System'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 80th 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 Sierra Water System compares to EPA limits
What This Means For You
PFOA at 1 mg/L exceeds the EPA maximum of 0.000004 mg/L.
PFNA at 1 mg/L exceeds the EPA maximum of 0.00001 mg/L.
Contaminant 2015 at 1 mg/L exceeds the EPA maximum of 0.0005 mg/L. Probable carcinogen; liver & thyroid damage, immune suppression. Consider granular activated carbon (GAC) filtration.
Chlorodibromomethane at 1 mg/L exceeds the EPA maximum of 0.002 mg/L. Liver cancer, brain cancer (known carcinogen). Consider granular activated carbon (GAC) filtration.
Atrazine at 1 mg/L exceeds the EPA maximum of 0.003 mg/L. Endocrine disruption, cardiovascular & reproductive effects. Consider granular activated carbon (GAC) filtration.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 2 detections recorded.
Contaminant 2015 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
Sierra Water System (EPA ID: WA5304643) is a community water system in Washington that serves approximately 355 people from groundwater sources.
This system provides water to 3 ZIP codes across 3 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 0 resolved, 40 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 |
|---|---|---|---|
| October 1, 2025 | PFOA | Non-health-based | Archived |
| October 1, 2025 | PFNA | Non-health-based | Archived |
| October 1, 2025 | Dichloroacetic Acid | Non-health-based | Archived |
| October 1, 2025 | Bromodichloromethane | Non-health-based | Archived |
| October 1, 2025 | Dibromochloromethane | Non-health-based | Archived |
| October 1, 2025 | Bromoform | Non-health-based | Archived |
| October 1, 2025 | Chlorodibromomethane | Non-health-based | Archived |
| October 1, 2025 | Trichloroacetic Acid | Non-health-based | Archived |
| October 1, 2025 | Monobromoacetic Acid | Non-health-based | Archived |
| October 1, 2025 | Dibromoacetic Acid | Non-health-based | Archived |
| October 1, 2025 | Bromochloroacetic Acid | Non-health-based | Archived |
| October 1, 2025 | Bromodichloroacetic Acid | Non-health-based | Archived |
| October 1, 2025 | Chlorodibromoacetic Acid | Non-health-based | Archived |
| October 1, 2025 | Tribromoacetic Acid | Non-health-based | Archived |
| October 1, 2025 | HAA6Br | Non-health-based | Archived |
| October 1, 2025 | HAA9 | Non-health-based | Archived |
| October 1, 2025 | Bromate | Non-health-based | Archived |
| October 1, 2025 | Chlorate | Non-health-based | Archived |
| October 1, 2025 | Chloramine | Non-health-based | Archived |
| October 1, 2025 | Total Organic Carbon | Non-health-based | Archived |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Contaminant 2005 | Other Violation | 1 | No |
| Contaminant 2010 | Other Violation | 1 | No |
| Contaminant 2015 | Other Violation | 1 | No |
| Contaminant 2020 | Other Violation | 1 | No |
| Contaminant 2031 | Other Violation | 1 | No |
| Contaminant 2035 | Other Violation | 1 | No |
| Contaminant 2037 | Other Violation | 1 | No |
| Atrazine | Organic | 1 | No |
| Contaminant 2040 | Other Violation | 1 | No |
| Contaminant 2041 | Other Violation | 1 | No |
| Contaminant 2042 | Other Violation | 1 | No |
| Benzene | Organic | 1 | No |
| Contaminant 2051 | Other Violation | 1 | No |
| Contaminant 2065 | Other Violation | 1 | No |
| Contaminant 2067 | Other Violation | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0019 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.
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
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.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Sierra Water System (WA5304643) on EPA.gov.
Frequently Asked Questions
Is Sierra Water System water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Sierra Water System; its 40 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Sierra Water System serve?
Sierra Water System serves approximately 355 people across 3 ZIP codes in Washington.
Where does Sierra Water System get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Sierra Water System (WA): 40 EPA Violations. https://zipcheckup.com/water-system/wa5304643/
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author = {{ZipCheckup}},
title = {{Sierra Water System (WA): 40 EPA Violations}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/wa5304643/}
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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
Sierra Water System (EPA ID: WA5304643) - request the latest Consumer Confidence Report or ask about specific contaminants.