Alderdale Water Assn
EPA ID: WA5326214 · 171 people served · 1 ZIP code
For the full five-year period covered by EPA monitoring, Alderdale Water Assn has supplied tap water to 171 residents with no violations of any type on record.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Demographics
The Alderdale Water Assn serves a community with a median household income of $74,393 and an estimated 14,278 residents across its service area. Approximately 54% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 31% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
💧 Where Does Your Water Come From?
Alderdale Water Assn'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.
About 1% of homes in Benton County, Washington rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 60th 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
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
Alderdale Water Assn (EPA ID: WA5326214) is a community water system in Washington that serves approximately 171 people from groundwater sources.
This system serves ZIP code 99350 in Prosser.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
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
- 99350 — Prosser
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Alderdale Water Assn (WA5326214) on EPA.gov.
Frequently Asked Questions
Is Alderdale Water Assn water safe to drink?
Based on EPA records, Alderdale Water Assn has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Alderdale Water Assn serve?
Alderdale Water Assn serves approximately 171 people across 1 ZIP code in Washington.
Where does Alderdale Water Assn get its water?
The primary water source is groundwater.