Olalla
EPA ID: WA5363215 · 239 people served · 1 ZIP code
ZipCheckup's reading of EPA records for Olalla (WA5363215): no drinking-water violations recorded since 2021. Zero violations are listed in EPA monitoring data for Olalla; a count of records like this is not a water-quality test for the 239 residents it serves.
Data: EPA SDWIS
Service Area Map
Coverage area for Olalla Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Olalla have a median household income of $97,335 and about 4,691 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 46% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Olalla's water is classified in EPA records as a groundwater source. 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
Comparable Water Systems
Similar-sized systems in Washington
System Overview
Olalla (EPA ID: WA5363215) is a community water system in Washington that serves approximately 239 people from groundwater sources.
This system serves ZIP code 98359 in Olalla.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0006 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: Ask your water utility whether running cold water for 2 minutes is enough to flush your plumbing before drinking.
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.
- 98359 - Olalla
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Olalla (WA5363215) on EPA.gov.
Frequently Asked Questions
Is Olalla water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Olalla in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Olalla serve?
Olalla serves approximately 239 people across 1 ZIP code in Washington.
Where does Olalla get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Olalla Water Quality Report, WA. https://zipcheckup.com/water-system/wa5363215/
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author = {{ZipCheckup}},
title = {{Olalla Water Quality Report, WA}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/wa5363215/}
}